C#编写的Windows计算器源代码

这并非本人亲自所写，但经本人调试后可用。
请创建一个Winform的应用程序，然后，删除Program.cs和Form1.design.cs文件。打开Form1.cs文件的Code视图，删除所有原有代码，将以下代码添入，即可。

using System;
using System.Drawing;
using System.Windows;
using System.Windows.Forms;
using System.Collections;
using System.ComponentModel;
using System.Data;

namespace TS.GUOFU.Comput
{
    /// <summary>
    /// 这是一个计算器的简单实现。
    /// </summary>

    public class Form1 : System.Windows.Forms.Form
    {
        #region 控件声明

        private System.Windows.Forms.TextBox txtShow;
        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.Button btn_rev;
        private System.Windows.Forms.Button btn_dot;
        private System.Windows.Forms.Button btn_add;
        private System.Windows.Forms.Button btn_equ;
        private System.Windows.Forms.Button btn_sign;
        private System.Windows.Forms.Button btn_sub;
        private System.Windows.Forms.Button btn_mul;
        private System.Windows.Forms.Button btn_0;
        private System.Windows.Forms.Button btn_3;
        private System.Windows.Forms.Button btn_2;
        private System.Windows.Forms.Button btn_1;
        private System.Windows.Forms.Button btn_6;
        private System.Windows.Forms.Button btn_5;
        private System.Windows.Forms.Button btn_4;
        private System.Windows.Forms.Button btn_sqrt;
        private System.Windows.Forms.Button btn_div;
        private System.Windows.Forms.Button btn_7;
        private System.Windows.Forms.Button btn_8;
        private System.Windows.Forms.Button btn_9;
        private System.Windows.Forms.MainMenu mainMenu1;
        private System.Windows.Forms.MenuItem menuItem1;
        private System.Windows.Forms.Button btn_sqr;
        private System.Windows.Forms.MenuItem menuItem2;
        private System.Windows.Forms.MenuItem menuItem3;
        private System.Windows.Forms.MenuItem menuItem4;
        private System.Windows.Forms.MenuItem menuItem5;
        private System.Windows.Forms.MenuItem menuItem6;
        private System.Windows.Forms.Button c;
        private System.Windows.Forms.Button ce;
        private System.Windows.Forms.MenuItem menuItem8;
        private System.Windows.Forms.MenuItem menuItem9;
        private System.Windows.Forms.MenuItem menuItem10;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }
        #endregion

        #region 各控件的属性的方法Windows Form Designer generated code
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
            this.txtShow = new System.Windows.Forms.TextBox();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.c = new System.Windows.Forms.Button();
            this.ce = new System.Windows.Forms.Button();
            this.btn_rev = new System.Windows.Forms.Button();
            this.btn_dot = new System.Windows.Forms.Button();
            this.btn_add = new System.Windows.Forms.Button();
            this.btn_equ = new System.Windows.Forms.Button();
            this.btn_sign = new System.Windows.Forms.Button();
            this.btn_sub = new System.Windows.Forms.Button();
            this.btn_mul = new System.Windows.Forms.Button();
            this.btn_0 = new System.Windows.Forms.Button();
            this.btn_3 = new System.Windows.Forms.Button();
            this.btn_2 = new System.Windows.Forms.Button();
            this.btn_1 = new System.Windows.Forms.Button();
            this.btn_6 = new System.Windows.Forms.Button();
            this.btn_5 = new System.Windows.Forms.Button();
            this.btn_4 = new System.Windows.Forms.Button();
            this.btn_sqrt = new System.Windows.Forms.Button();
            this.btn_div = new System.Windows.Forms.Button();
            this.btn_7 = new System.Windows.Forms.Button();
            this.btn_8 = new System.Windows.Forms.Button();
            this.btn_9 = new System.Windows.Forms.Button();
            this.btn_sqr = new System.Windows.Forms.Button();
            this.mainMenu1 = new System.Windows.Forms.MainMenu();
            this.menuItem1 = new System.Windows.Forms.MenuItem();
            this.menuItem2 = new System.Windows.Forms.MenuItem();
            this.menuItem3 = new System.Windows.Forms.MenuItem();
            this.menuItem4 = new System.Windows.Forms.MenuItem();
            this.menuItem5 = new System.Windows.Forms.MenuItem();
            this.menuItem6 = new System.Windows.Forms.MenuItem();
            this.menuItem8 = new System.Windows.Forms.MenuItem();
            this.menuItem9 = new System.Windows.Forms.MenuItem();
            this.menuItem10 = new System.Windows.Forms.MenuItem();
            this.groupBox1.SuspendLayout();
            this.SuspendLayout();
            //
            // txtShow
            //
            this.txtShow.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(192)), ((System.Byte)(192)), ((System.Byte)(255)));
            this.txtShow.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.txtShow.ForeColor = System.Drawing.Color.Purple;
            this.txtShow.Location = new System.Drawing.Point(25, 8);
            this.txtShow.Name = "txtShow";
            this.txtShow.Size = new System.Drawing.Size(228, 23);
            this.txtShow.TabIndex = 1;
            this.txtShow.Text = "0.";
            this.txtShow.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
            //
            // groupBox1
            //
            this.groupBox1.Controls.Add(this.c);
            this.groupBox1.Controls.Add(this.ce);
            this.groupBox1.Controls.Add(this.btn_rev);
            this.groupBox1.Controls.Add(this.btn_dot);
            this.groupBox1.Controls.Add(this.btn_add);
            this.groupBox1.Controls.Add(this.btn_equ);
            this.groupBox1.Controls.Add(this.btn_sign);
            this.groupBox1.Controls.Add(this.btn_sub);
            this.groupBox1.Controls.Add(this.btn_mul);
            this.groupBox1.Controls.Add(this.btn_0);
            this.groupBox1.Controls.Add(this.btn_3);
            this.groupBox1.Controls.Add(this.btn_2);
            this.groupBox1.Controls.Add(this.btn_1);
            this.groupBox1.Controls.Add(this.btn_6);
            this.groupBox1.Controls.Add(this.btn_5);
            this.groupBox1.Controls.Add(this.btn_4);
            this.groupBox1.Controls.Add(this.btn_sqrt);
            this.groupBox1.Controls.Add(this.btn_div);
            this.groupBox1.Controls.Add(this.btn_7);
            this.groupBox1.Controls.Add(this.btn_8);
            this.groupBox1.Controls.Add(this.btn_9);
            this.groupBox1.Controls.Add(this.btn_sqr);
            this.groupBox1.Location = new System.Drawing.Point(24, 40);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(232, 184);
            this.groupBox1.TabIndex = 21;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "计算机区";
            //
            // c
            //
            this.c.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.c.ForeColor = System.Drawing.Color.Red;
            this.c.Location = new System.Drawing.Point(178, 48);
            this.c.Name = "c";
            this.c.Size = new System.Drawing.Size(36, 61);
            this.c.TabIndex = 41;
            this.c.Text = "C";
            this.c.Click += new System.EventHandler(this.btn_Oper);
            //
            // ce
            //
            this.ce.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.ce.ForeColor = System.Drawing.Color.Red;
            this.ce.Location = new System.Drawing.Point(138, 16);
            this.ce.Name = "ce";
            this.ce.Size = new System.Drawing.Size(76, 29);
            this.ce.TabIndex = 40;
            this.ce.Text = "CE";
            this.ce.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_rev
            //
            this.btn_rev.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_rev.ForeColor = System.Drawing.Color.Blue;
            this.btn_rev.Location = new System.Drawing.Point(178, 112);
            this.btn_rev.Name = "btn_rev";
            this.btn_rev.Size = new System.Drawing.Size(36, 29);
            this.btn_rev.TabIndex = 39;
            this.btn_rev.Text = "1/x";
            this.btn_rev.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_dot
            //
            this.btn_dot.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_dot.Location = new System.Drawing.Point(98, 144);
            this.btn_dot.Name = "btn_dot";
            this.btn_dot.Size = new System.Drawing.Size(36, 29);
            this.btn_dot.TabIndex = 38;
            this.btn_dot.Tag = "0";
            this.btn_dot.Text = ".";
            this.btn_dot.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_add
            //
            this.btn_add.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_add.ForeColor = System.Drawing.Color.Red;
            this.btn_add.Location = new System.Drawing.Point(138, 144);
            this.btn_add.Name = "btn_add";
            this.btn_add.Size = new System.Drawing.Size(36, 29);
            this.btn_add.TabIndex = 37;
            this.btn_add.Text = "+";
            this.btn_add.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_equ
            //
            this.btn_equ.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_equ.ForeColor = System.Drawing.Color.Red;
            this.btn_equ.Location = new System.Drawing.Point(178, 144);
            this.btn_equ.Name = "btn_equ";
            this.btn_equ.Size = new System.Drawing.Size(36, 29);
            this.btn_equ.TabIndex = 36;
            this.btn_equ.Text = "=";
            this.btn_equ.Click += new System.EventHandler(this.btn_equ_Click);
            //
            // btn_sign
            //
            this.btn_sign.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_sign.ForeColor = System.Drawing.Color.Blue;
            this.btn_sign.Location = new System.Drawing.Point(58, 144);
            this.btn_sign.Name = "btn_sign";
            this.btn_sign.Size = new System.Drawing.Size(36, 29);
            this.btn_sign.TabIndex = 35;
            this.btn_sign.Text = "+/-";
            this.btn_sign.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_sub
            //
            this.btn_sub.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_sub.ForeColor = System.Drawing.Color.Red;
            this.btn_sub.Location = new System.Drawing.Point(138, 112);
            this.btn_sub.Name = "btn_sub";
            this.btn_sub.Size = new System.Drawing.Size(36, 29);
            this.btn_sub.TabIndex = 34;
            this.btn_sub.Text = "-";
            this.btn_sub.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_mul
            //
            this.btn_mul.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_mul.ForeColor = System.Drawing.Color.Red;
            this.btn_mul.Location = new System.Drawing.Point(138, 80);
            this.btn_mul.Name = "btn_mul";
            this.btn_mul.Size = new System.Drawing.Size(36, 29);
            this.btn_mul.TabIndex = 33;
            this.btn_mul.Text = "*";
            this.btn_mul.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_0
            //
            this.btn_0.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_0.ForeColor = System.Drawing.Color.Blue;
            this.btn_0.Location = new System.Drawing.Point(18, 144);
            this.btn_0.Name = "btn_0";
            this.btn_0.Size = new System.Drawing.Size(36, 29);
            this.btn_0.TabIndex = 32;
            this.btn_0.Tag = "0";
            this.btn_0.Text = "0";
            this.btn_0.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_3
            //
            this.btn_3.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_3.ForeColor = System.Drawing.Color.Blue;
            this.btn_3.Location = new System.Drawing.Point(98, 112);
            this.btn_3.Name = "btn_3";
            this.btn_3.Size = new System.Drawing.Size(36, 29);
            this.btn_3.TabIndex = 31;
            this.btn_3.Tag = "3";
            this.btn_3.Text = "3";
            this.btn_3.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_2
            //
            this.btn_2.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_2.ForeColor = System.Drawing.Color.Blue;
            this.btn_2.Location = new System.Drawing.Point(58, 112);
            this.btn_2.Name = "btn_2";
            this.btn_2.Size = new System.Drawing.Size(36, 29);
            this.btn_2.TabIndex = 30;
            this.btn_2.Tag = "2";
            this.btn_2.Text = "2";
            this.btn_2.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_1
            //
            this.btn_1.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_1.ForeColor = System.Drawing.Color.Blue;
            this.btn_1.Location = new System.Drawing.Point(18, 112);
            this.btn_1.Name = "btn_1";
            this.btn_1.Size = new System.Drawing.Size(36, 29);
            this.btn_1.TabIndex = 29;
            this.btn_1.Tag = "1";
            this.btn_1.Text = "1";
            this.btn_1.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_6
            //
            this.btn_6.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_6.ForeColor = System.Drawing.Color.Blue;
            this.btn_6.Location = new System.Drawing.Point(98, 80);
            this.btn_6.Name = "btn_6";
            this.btn_6.Size = new System.Drawing.Size(36, 29);
            this.btn_6.TabIndex = 28;
            this.btn_6.Tag = "6";
            this.btn_6.Text = "6";
            this.btn_6.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_5
            //
            this.btn_5.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_5.ForeColor = System.Drawing.Color.Blue;
            this.btn_5.Location = new System.Drawing.Point(58, 80);
            this.btn_5.Name = "btn_5";
            this.btn_5.Size = new System.Drawing.Size(36, 29);
            this.btn_5.TabIndex = 27;
            this.btn_5.Tag = "5";
            this.btn_5.Text = "5";
            this.btn_5.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_4
            //
            this.btn_4.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_4.ForeColor = System.Drawing.Color.Blue;
            this.btn_4.Location = new System.Drawing.Point(18, 80);
            this.btn_4.Name = "btn_4";
            this.btn_4.Size = new System.Drawing.Size(36, 29);
            this.btn_4.TabIndex = 26;
            this.btn_4.Tag = "4";
            this.btn_4.Text = "4";
            this.btn_4.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_sqrt
            //
            this.btn_sqrt.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_sqrt.ForeColor = System.Drawing.Color.Blue;
            this.btn_sqrt.Location = new System.Drawing.Point(18, 16);
            this.btn_sqrt.Name = "btn_sqrt";
            this.btn_sqrt.Size = new System.Drawing.Size(76, 29);
            this.btn_sqrt.TabIndex = 25;
            this.btn_sqrt.Text = "sqrt";
            this.btn_sqrt.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_div
            //
            this.btn_div.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_div.ForeColor = System.Drawing.Color.Red;
            this.btn_div.Location = new System.Drawing.Point(138, 48);
            this.btn_div.Name = "btn_div";
            this.btn_div.Size = new System.Drawing.Size(36, 29);
            this.btn_div.TabIndex = 24;
            this.btn_div.Text = "/";
            this.btn_div.Click += new System.EventHandler(this.btn_Oper);
            //
            // btn_7
            //
            this.btn_7.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_7.ForeColor = System.Drawing.Color.Blue;
            this.btn_7.Location = new System.Drawing.Point(18, 48);
            this.btn_7.Name = "btn_7";
            this.btn_7.Size = new System.Drawing.Size(36, 29);
            this.btn_7.TabIndex = 23;
            this.btn_7.Tag = "7";
            this.btn_7.Text = "7";
            this.btn_7.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_8
            //
            this.btn_8.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_8.ForeColor = System.Drawing.Color.Blue;
            this.btn_8.Location = new System.Drawing.Point(58, 48);
            this.btn_8.Name = "btn_8";
            this.btn_8.Size = new System.Drawing.Size(36, 29);
            this.btn_8.TabIndex = 22;
            this.btn_8.Tag = "8";
            this.btn_8.Text = "8";
            this.btn_8.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_9
            //
            this.btn_9.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_9.ForeColor = System.Drawing.Color.Blue;
            this.btn_9.Location = new System.Drawing.Point(98, 48);
            this.btn_9.Name = "btn_9";
            this.btn_9.Size = new System.Drawing.Size(36, 29);
            this.btn_9.TabIndex = 21;
            this.btn_9.Tag = "9";
            this.btn_9.Text = "9";
            this.btn_9.Click += new System.EventHandler(this.btn_0_Click);
            //
            // btn_sqr
            //
            this.btn_sqr.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
            this.btn_sqr.ForeColor = System.Drawing.Color.Blue;
            this.btn_sqr.Location = new System.Drawing.Point(98, 16);
            this.btn_sqr.Name = "btn_sqr";
            this.btn_sqr.Size = new System.Drawing.Size(36, 29);
            this.btn_sqr.TabIndex = 19;
            this.btn_sqr.Text = "sqr";
            this.btn_sqr.Click += new System.EventHandler(this.btn_Oper);
            //
            // mainMenu1
            //
            this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.menuItem8,
                                                                                      this.menuItem1,
                                                                                      this.menuItem4});
            //
            // menuItem1
            //
            this.menuItem1.Index = 1;
            this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.menuItem2,
                                                                                      this.menuItem3});
            this.menuItem1.Text = "编辑(&E)";
            //
            // menuItem2
            //
            this.menuItem2.Index = 0;
            this.menuItem2.Text = "复制(&C)";
            this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);
            //
            // menuItem3
            //
            this.menuItem3.Index = 1;
            this.menuItem3.Text = "粘贴(&P)";
            this.menuItem3.Click += new System.EventHandler(this.menuItem3_Click);
            //
            // menuItem4
            //
            this.menuItem4.Index = 2;
            this.menuItem4.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.menuItem5,
                                                                                      this.menuItem6});
            this.menuItem4.Text = "帮助(&H)";
            //
            // menuItem5
            //
            this.menuItem5.Index = 0;
            this.menuItem5.Text = "帮助主题(&H)";
            this.menuItem5.Click += new System.EventHandler(this.menuItem5_Click);
            //
            // menuItem6
            //
            this.menuItem6.Index = 1;
            this.menuItem6.Text = "关于(&A)";
            //this.menuItem6.Click += new System.EventHandler(this.menuItem6_Click);
            //
            // menuItem8
            //
            this.menuItem8.Index = 0;
            this.menuItem8.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.menuItem9,
                                                                                      this.menuItem10});
            this.menuItem8.Text = "文件(&F)";
            //
            // menuItem9
            //
            this.menuItem9.Index = 0;
            this.menuItem9.Text = "打开windows计算器(&O)";
            this.menuItem9.Click += new System.EventHandler(this.menuItem9_Click);
            //
            // menuItem10
            //
            this.menuItem10.Index = 1;
            this.menuItem10.Text = "退出(&Q)";
            this.menuItem10.Click += new System.EventHandler(this.menuItem10_Click);
            //
            // Form1
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(278, 239);
            this.Controls.Add(this.groupBox1);
            this.Controls.Add(this.txtShow);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;
            //this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
            this.MaximizeBox = false;
            this.Menu = this.mainMenu1;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "计算器";
            this.groupBox1.ResumeLayout(false);
            this.ResumeLayout(false);

        }
        #endregion

        #region 各变量和常数的声明
        public const int NULL = 0;      // 定义操作码
        public const int ADD = 1;     //表示加
        public const int SUB = 2;     //减
        public const int MUL = 3;     //乘
        public const int DIV = 4;    //除
        public const int SQR = 5;    //求平方
        public const int SQRT = 6;   //求平方根
        public const int NODOT = 0;     // 定义是否点击了小数点,0 为没点
        public const int HASDOT = 1;
        private double res = 0;         // 记录结果数
        private double tmp = 0;         // 当前输入的操作数
        private int opt = NULL;         // 记录操作码
        private int dot = NODOT;    // 记录是否点击了小数点,0为没有点
        private int num = 0;        // 记录输入操作数的个数
        private int dotnum = 0;        // 记录小数点部分的个数       
        string strOper;            //获取操作符
        #endregion
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }

        /// <summary>

        #region 获取操作数事件
        //获取操作数事件

        private void btn_0_Click(object sender, System.EventArgs e)
        {
            System.Windows.Forms.Button btnTmp;
            double i;

            btnTmp = sender as System.Windows.Forms.Button;
            if (btnTmp != null)
            {
                if (dot == NODOT)
                {
                    // 没有点击小数点
                    i = double.Parse(btnTmp.Tag.ToString()); //取用户自定义的控件关联数,并转换成double型
                    tmp = tmp * 10 + i;
                    txtShow.Text = tmp.ToString();   //将其放入文本显示屏啊
                }
                else   // 点击了小数点
                {
                    dotnum++;    //记录小数点部分的个数
                    // 生成小数部分的新的数值
                    i = double.Parse(btnTmp.Tag.ToString()) / System.Math.Pow(10, dotnum);
                    tmp = tmp + i;  //将小数点后的值加到当前操做数
                    txtShow.Text = tmp.ToString();
                }
            }
        }
        #endregion

        #region 等于事件和等于运算方法
        //等于事件
        private void btn_equ_Click(object sender, System.EventArgs e)
        {
            calc();
        }

        //等于运算方法
        private void calc()
        {
            // 生成结果
            if (num == 0)    //是否有操作数,没有就返回0
            {
                res = 0;
                tmp = 0;
                txtShow.Text = res.ToString();
                return;
            }

            switch (opt)  //找到对应的运算符进行计算
            {
                // 加法
                case ADD:
                    res = res + tmp;
                    break;
                // 减法
                case SUB:
                    res = res - tmp;
                    break;
                // 乘法
                case MUL:
                    res = res * tmp;
                    break;
                // 除法
                case DIV:
                    res = res / tmp;
                    break;
                // 平方
                case SQR:
                    res = tmp * tmp;
                    break;
                // 平方根
                case SQRT:
                    res = System.Math.Sqrt(tmp);
                    break;
                default:
                    return;
            }
            txtShow.Text = res.ToString();   //结果输出到文本显示屏
            opt = NULL;  //运算符清空
            tmp = 0;
            dot = NODOT;
            //res = 0;
            //num = 0;
        }
        #endregion

        #region 获取操作符运事件
        //获取操作符运事件
        private void btn_Oper(object obj, EventArgs ea)
        {
            Button tmp1 = (Button)obj;
            strOper = tmp1.Text;
            switch (strOper)
            {
                case "/":       //除法运算
                    if (opt != NULL && opt != DIV)
                    {
                        calc();
                    }
                    opt = DIV;
                    if (num != 0)  //判断操作数的个数,如果两个就做二元运算
                    {
                        if (tmp != 0)
                            res = res / tmp;
                    }
                    else
                        res = tmp;
                    num++;
                    tmp = 0;
                    txtShow.Text = res.ToString();
                    dot = NODOT;
                    break;
                case "*":
                    // 乘法运算
                    if (opt != NULL && opt != MUL)
                    {
                        calc();
                    }

                    opt = MUL;

                    if (num != 0)     //判断操作数的个数,如果两个就做二元运算   
                    {
                        if (tmp != 0)
                            res = res * tmp;
                    }
                    else
                        res = tmp;

                    num++;
                    tmp = 0;
                    txtShow.Text = res.ToString();
                    dot = NODOT;
                    break;
                case "+":            //加法运算
                    if (opt != NULL && opt != ADD)
                    {
                        calc();
                    }
                    opt = ADD;
                    if (num != 0)    //判断操作数的个数,如果两个就做二元运算
                        res = res + tmp;
                    else
                        res = tmp;
                    num++;
                    tmp = 0;
                    txtShow.Text = res.ToString();
                    dot = NODOT;
                    break;
                case "-":        //减法运算
                    if (opt != NULL && opt != SUB)
                    {
                        calc();
                    }
                    /*if(opt==ADD)
                    {
                        res=res+tmp;
                        tmp=0;
                    }*/
                    opt = SUB;
                    if (num != 0)    //判断操作数的个数,如果两个就做二元运算
                        res = res - tmp;
                    else
                        res = tmp;
                    num++;
                    tmp = 0;
                    txtShow.Text = res.ToString();
                    dot = NODOT;
                    break;
                case "sqrt":     //平方根运算
                    if (opt != NULL)
                    {
                        calc();
                    }

                    //opt=SQRT;
                    if (tmp > 0)  //要求操作数大于0
                    {
                        res = Math.Sqrt(tmp);
                        //res=tmp;
                    }
                    else if (res > 0)
                        res = Math.Sqrt(res);
                    txtShow.Text = res.ToString();
                    num++;
                    tmp = 0;
                    dot = NODOT;
                    break;
                case "sqr":
                    // 平方运算
                    if (opt != NULL)
                    {
                        calc();
                    }
                    //opt=SQR;
                    if (tmp != 0)
                    {
                        res = tmp * tmp;
                        //res=tmp;
                    }
                    else
                        res = res * res;

                    txtShow.Text = res.ToString();
                    num++;
                    tmp = 0;
                    dot = NODOT;
                    break;
                case "1/x":  //倒数运算
                    if (opt != NULL)
                    {
                        calc();
                    }
                    if (tmp != 0)
                    {
                        res = 1 / tmp;
                        //res=tmp;
                    }
                    else
                        res = 1 / res;
                    txtShow.Text = res.ToString();
                    tmp = 0;
                    dot = NODOT;
                    break;
                case ".":
                    // 点击了小数点
                    if (dot == HASDOT)
                        return;
                    else
                    {
                        dot = HASDOT;
                        dotnum = 0;
                    }
                    break;
                case "+/-":
                    // 点击了符号运算
                    if (tmp != 0)
                    {
                        tmp = -tmp;
                        txtShow.Text = tmp.ToString();
                    }
                    else
                    {
                        res = -res;
                        //res=tmp;
                        txtShow.Text = res.ToString();
                    }
                    dot = NODOT;
                    break;
                case "CE":     //清除运算
                    res = 0;         // 记录结果数
                    tmp = 0;         // 当前输入的操作数
                    opt = NULL;         // 记录操作码
                    dot = NODOT;    // 记录是否点击了小数点
                    num = 0;        // 记录输入操作数的个数
                    dotnum = 0;        // 记录小数点部分的个数
                    txtShow.Text = "";
                    break;
                case "C":         //清除运算
                    res = 0;         // 记录结果数
                    tmp = 0;         // 当前输入的操作数
                    opt = NULL;         // 记录操作码
                    dot = NODOT;    // 记录是否点击了小数点
                    num = 0;        // 记录输入操作数的个数
                    dotnum = 0;        // 记录小数点部分的个数
                    txtShow.Text = "";
                    break;

            }
        }

        #endregion

        #region     主菜单事件
        //打开关于主题---调用windows xp中计算器的帮助
        private void menuItem5_Click(object sender, System.EventArgs e)
        {
            Help.ShowHelp(this, "C:\\WINDOWS\\Help\\calc.chm");
        }

        //打开于我们
        //private void menuItem6_Click(object sender, System.EventArgs e)
        //{
        //    Form2 fm = new Form2();
        //    fm.Show();

        //}

        //复制
        private void menuItem2_Click(object sender, System.EventArgs e)
        {
            if (txtShow.SelectionLength > 0)
            {
                txtShow.Copy();
            }
        }
        //
        //粘贴
        private void menuItem3_Click(object sender, System.EventArgs e)
        {
            txtShow.Paste();
        }

        //调用windows xp中的计算器
        private void menuItem9_Click(object sender, System.EventArgs e)
        {
            Help.ShowHelp(this, "C:\\WINDOWS\\system32\\calc.exe");
        }
        //退出
        private void menuItem10_Click(object sender, System.EventArgs e)
        {
            Application.Exit();
        }

        #endregion

    }
}

附原有代码：

  1using System;
  2using System.Drawing;
  3using System.Windows;
  4using System.Windows.Forms;
  5using System.Collections;
  6using System.ComponentModel;
  7using System.Data;
  8
  9namespace comput
 10{
 11    /**//// <summary>
 12    /// 这是一个计算器的简单实现。
 13    /// </summary>
 14
 15    public class Form1 : System.Windows.Forms.Form
 16    {
 17        控件声明#region 控件声明
 18    
 19        private System.Windows.Forms.TextBox txtShow;
 20        private System.Windows.Forms.GroupBox groupBox1;
 21        private System.Windows.Forms.Button btn_rev;
 22        private System.Windows.Forms.Button btn_dot;
 23        private System.Windows.Forms.Button btn_add;
 24        private System.Windows.Forms.Button btn_equ;
 25        private System.Windows.Forms.Button btn_sign;
 26        private System.Windows.Forms.Button btn_sub;
 27        private System.Windows.Forms.Button btn_mul;
 28        private System.Windows.Forms.Button btn_0;
 29        private System.Windows.Forms.Button btn_3;
 30        private System.Windows.Forms.Button btn_2;
 31        private System.Windows.Forms.Button btn_1;
 32        private System.Windows.Forms.Button btn_6;
 33        private System.Windows.Forms.Button btn_5;
 34        private System.Windows.Forms.Button btn_4;
 35        private System.Windows.Forms.Button btn_sqrt;
 36        private System.Windows.Forms.Button btn_div;
 37        private System.Windows.Forms.Button btn_7;
 38        private System.Windows.Forms.Button btn_8;
 39        private System.Windows.Forms.Button btn_9;
 40        private System.Windows.Forms.MainMenu mainMenu1;
 41        private System.Windows.Forms.MenuItem menuItem1;
 42        private System.Windows.Forms.Button btn_sqr;
 43        private System.Windows.Forms.MenuItem menuItem2;
 44        private System.Windows.Forms.MenuItem menuItem3;
 45        private System.Windows.Forms.MenuItem menuItem4;
 46        private System.Windows.Forms.MenuItem menuItem5;
 47        private System.Windows.Forms.MenuItem menuItem6;
 48        private System.Windows.Forms.Button c;
 49        private System.Windows.Forms.Button ce;
 50        private System.Windows.Forms.MenuItem menuItem8;
 51        private System.Windows.Forms.MenuItem menuItem9;
 52        private System.Windows.Forms.MenuItem menuItem10;
 53        /**//// <summary>
 54        /// 必需的设计器变量。
 55        /// </summary>
 56        private System.ComponentModel.Container components = null;
 57        
 58        
 59        public Form1()
 60        {
 61            //
 62            // Windows 窗体设计器支持所必需的
 63            //
 64            InitializeComponent();
 65
 66            //
 67            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
 68            //
 69        }
 70        
 71
 72
 73        /**//// <summary>
 74        /// 清理所有正在使用的资源。
 75        /// </summary>
 76        protected override void Dispose( bool disposing )
 77        {
 78            if( disposing )
 79            {
 80                if (components != null) 
 81                {
 82                    components.Dispose();
 83                }
 84            }
 85            base.Dispose( disposing );
 86        }
 87       #endregion
 88
 89        各控件的属性的方法Windows Form Designer generated code#region 各控件的属性的方法Windows Form Designer generated code
 90        /**//// <summary>
 91        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
 92        /// 此方法的内容。
 93        /// </summary>
 94        private void InitializeComponent()
 95        {
 96            System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
 97            this.txtShow = new System.Windows.Forms.TextBox();
 98            this.groupBox1 = new System.Windows.Forms.GroupBox();
 99            this.c = new System.Windows.Forms.Button();
100            this.ce = new System.Windows.Forms.Button();
101            this.btn_rev = new System.Windows.Forms.Button();
102            this.btn_dot = new System.Windows.Forms.Button();
103            this.btn_add = new System.Windows.Forms.Button();
104            this.btn_equ = new System.Windows.Forms.Button();
105            this.btn_sign = new System.Windows.Forms.Button();
106            this.btn_sub = new System.Windows.Forms.Button();
107            this.btn_mul = new System.Windows.Forms.Button();
108            this.btn_0 = new System.Windows.Forms.Button();
109            this.btn_3 = new System.Windows.Forms.Button();
110            this.btn_2 = new System.Windows.Forms.Button();
111            this.btn_1 = new System.Windows.Forms.Button();
112            this.btn_6 = new System.Windows.Forms.Button();
113            this.btn_5 = new System.Windows.Forms.Button();
114            this.btn_4 = new System.Windows.Forms.Button();
115            this.btn_sqrt = new System.Windows.Forms.Button();
116            this.btn_div = new System.Windows.Forms.Button();
117            this.btn_7 = new System.Windows.Forms.Button();
118            this.btn_8 = new System.Windows.Forms.Button();
119            this.btn_9 = new System.Windows.Forms.Button();
120            this.btn_sqr = new System.Windows.Forms.Button();
121            this.mainMenu1 = new System.Windows.Forms.MainMenu();
122            this.menuItem1 = new System.Windows.Forms.MenuItem();
123            this.menuItem2 = new System.Windows.Forms.MenuItem();
124            this.menuItem3 = new System.Windows.Forms.MenuItem();
125            this.menuItem4 = new System.Windows.Forms.MenuItem();
126            this.menuItem5 = new System.Windows.Forms.MenuItem();
127            this.menuItem6 = new System.Windows.Forms.MenuItem();
128            this.menuItem8 = new System.Windows.Forms.MenuItem();
129            this.menuItem9 = new System.Windows.Forms.MenuItem();
130            this.menuItem10 = new System.Windows.Forms.MenuItem();
131            this.groupBox1.SuspendLayout();
132            this.SuspendLayout();
133            // 
134            // txtShow
135            // 
136            this.txtShow.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(192)), ((System.Byte)(192)), ((System.Byte)(255)));
137            this.txtShow.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
138            this.txtShow.ForeColor = System.Drawing.Color.Purple;
139            this.txtShow.Location = new System.Drawing.Point(25, 8);
140            this.txtShow.Name = "txtShow";
141            this.txtShow.Size = new System.Drawing.Size(228, 23);
142            this.txtShow.TabIndex = 1;
143            this.txtShow.Text = "0.";
144            this.txtShow.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
145            // 
146            // groupBox1
147            // 
148            this.groupBox1.Controls.Add(this.c);
149            this.groupBox1.Controls.Add(this.ce);
150            this.groupBox1.Controls.Add(this.btn_rev);
151            this.groupBox1.Controls.Add(this.btn_dot);
152            this.groupBox1.Controls.Add(this.btn_add);
153            this.groupBox1.Controls.Add(this.btn_equ);
154            this.groupBox1.Controls.Add(this.btn_sign);
155            this.groupBox1.Controls.Add(this.btn_sub);
156            this.groupBox1.Controls.Add(this.btn_mul);
157            this.groupBox1.Controls.Add(this.btn_0);
158            this.groupBox1.Controls.Add(this.btn_3);
159            this.groupBox1.Controls.Add(this.btn_2);
160            this.groupBox1.Controls.Add(this.btn_1);
161            this.groupBox1.Controls.Add(this.btn_6);
162            this.groupBox1.Controls.Add(this.btn_5);
163            this.groupBox1.Controls.Add(this.btn_4);
164            this.groupBox1.Controls.Add(this.btn_sqrt);
165            this.groupBox1.Controls.Add(this.btn_div);
166            this.groupBox1.Controls.Add(this.btn_7);
167            this.groupBox1.Controls.Add(this.btn_8);
168            this.groupBox1.Controls.Add(this.btn_9);
169            this.groupBox1.Controls.Add(this.btn_sqr);
170            this.groupBox1.Location = new System.Drawing.Point(24, 40);
171            this.groupBox1.Name = "groupBox1";
172            this.groupBox1.Size = new System.Drawing.Size(232, 184);
173            this.groupBox1.TabIndex = 21;
174            this.groupBox1.TabStop = false;
175            this.groupBox1.Text = "计算机区";
176            // 
177            // c
178            // 
179            this.c.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
180            this.c.ForeColor = System.Drawing.Color.Red;
181            this.c.Location = new System.Drawing.Point(178, 48);
182            this.c.Name = "c";
183            this.c.Size = new System.Drawing.Size(36, 61);
184            this.c.TabIndex = 41;
185            this.c.Text = "C";
186            this.c.Click += new System.EventHandler(this.btn_Oper);
187            // 
188            // ce
189            // 
190            this.ce.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
191            this.ce.ForeColor = System.Drawing.Color.Red;
192            this.ce.Location = new System.Drawing.Point(138, 16);
193            this.ce.Name = "ce";
194            this.ce.Size = new System.Drawing.Size(76, 29);
195            this.ce.TabIndex = 40;
196            this.ce.Text = "CE";
197            this.ce.Click += new System.EventHandler(this.btn_Oper);
198            // 
199            // btn_rev
200            // 
201            this.btn_rev.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
202            this.btn_rev.ForeColor = System.Drawing.Color.Blue;
203            this.btn_rev.Location = new System.Drawing.Point(178, 112);
204            this.btn_rev.Name = "btn_rev";
205            this.btn_rev.Size = new System.Drawing.Size(36, 29);
206            this.btn_rev.TabIndex = 39;
207            this.btn_rev.Text = "1/x";
208            this.btn_rev.Click += new System.EventHandler(this.btn_Oper);
209            // 
210            // btn_dot
211            // 
212            this.btn_dot.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
213            this.btn_dot.Location = new System.Drawing.Point(98, 144);
214            this.btn_dot.Name = "btn_dot";
215            this.btn_dot.Size = new System.Drawing.Size(36, 29);
216            this.btn_dot.TabIndex = 38;
217            this.btn_dot.Tag = "0";
218            this.btn_dot.Text = ".";
219            this.btn_dot.Click += new System.EventHandler(this.btn_Oper);
220            // 
221            // btn_add
222            // 
223            this.btn_add.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
224            this.btn_add.ForeColor = System.Drawing.Color.Red;
225            this.btn_add.Location = new System.Drawing.Point(138, 144);
226            this.btn_add.Name = "btn_add";
227            this.btn_add.Size = new System.Drawing.Size(36, 29);
228            this.btn_add.TabIndex = 37;
229            this.btn_add.Text = "+";
230            this.btn_add.Click += new System.EventHandler(this.btn_Oper);
231            // 
232            // btn_equ
233            // 
234            this.btn_equ.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
235            this.btn_equ.ForeColor = System.Drawing.Color.Red;
236            this.btn_equ.Location = new System.Drawing.Point(178, 144);
237            this.btn_equ.Name = "btn_equ";
238            this.btn_equ.Size = new System.Drawing.Size(36, 29);
239            this.btn_equ.TabIndex = 36;
240            this.btn_equ.Text = "=";
241            this.btn_equ.Click += new System.EventHandler(this.btn_equ_Click);
242            // 
243            // btn_sign
244            // 
245            this.btn_sign.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
246            this.btn_sign.ForeColor = System.Drawing.Color.Blue;
247            this.btn_sign.Location = new System.Drawing.Point(58, 144);
248            this.btn_sign.Name = "btn_sign";
249            this.btn_sign.Size = new System.Drawing.Size(36, 29);
250            this.btn_sign.TabIndex = 35;
251            this.btn_sign.Text = "+/-";
252            this.btn_sign.Click += new System.EventHandler(this.btn_Oper);
253            // 
254            // btn_sub
255            // 
256            this.btn_sub.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
257            this.btn_sub.ForeColor = System.Drawing.Color.Red;
258            this.btn_sub.Location = new System.Drawing.Point(138, 112);
259            this.btn_sub.Name = "btn_sub";
260            this.btn_sub.Size = new System.Drawing.Size(36, 29);
261            this.btn_sub.TabIndex = 34;
262            this.btn_sub.Text = "-";
263            this.btn_sub.Click += new System.EventHandler(this.btn_Oper);
264            // 
265            // btn_mul
266            // 
267            this.btn_mul.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
268            this.btn_mul.ForeColor = System.Drawing.Color.Red;
269            this.btn_mul.Location = new System.Drawing.Point(138, 80);
270            this.btn_mul.Name = "btn_mul";
271            this.btn_mul.Size = new System.Drawing.Size(36, 29);
272            this.btn_mul.TabIndex = 33;
273            this.btn_mul.Text = "*";
274            this.btn_mul.Click += new System.EventHandler(this.btn_Oper);
275            // 
276            // btn_0
277            // 
278            this.btn_0.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
279            this.btn_0.ForeColor = System.Drawing.Color.Blue;
280            this.btn_0.Location = new System.Drawing.Point(18, 144);
281            this.btn_0.Name = "btn_0";
282            this.btn_0.Size = new System.Drawing.Size(36, 29);
283            this.btn_0.TabIndex = 32;
284            this.btn_0.Tag = "0";
285            this.btn_0.Text = "0";
286            this.btn_0.Click += new System.EventHandler(this.btn_0_Click);
287            // 
288            // btn_3
289            // 
290            this.btn_3.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
291            this.btn_3.ForeColor = System.Drawing.Color.Blue;
292            this.btn_3.Location = new System.Drawing.Point(98, 112);
293            this.btn_3.Name = "btn_3";
294            this.btn_3.Size = new System.Drawing.Size(36, 29);
295            this.btn_3.TabIndex = 31;
296            this.btn_3.Tag = "3";
297            this.btn_3.Text = "3";
298            this.btn_3.Click += new System.EventHandler(this.btn_0_Click);
299            // 
300            // btn_2
301            // 
302            this.btn_2.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
303            this.btn_2.ForeColor = System.Drawing.Color.Blue;
304            this.btn_2.Location = new System.Drawing.Point(58, 112);
305            this.btn_2.Name = "btn_2";
306            this.btn_2.Size = new System.Drawing.Size(36, 29);
307            this.btn_2.TabIndex = 30;
308            this.btn_2.Tag = "2";
309            this.btn_2.Text = "2";
310            this.btn_2.Click += new System.EventHandler(this.btn_0_Click);
311            // 
312            // btn_1
313            // 
314            this.btn_1.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
315            this.btn_1.ForeColor = System.Drawing.Color.Blue;
316            this.btn_1.Location = new System.Drawing.Point(18, 112);
317            this.btn_1.Name = "btn_1";
318            this.btn_1.Size = new System.Drawing.Size(36, 29);
319            this.btn_1.TabIndex = 29;
320            this.btn_1.Tag = "1";
321            this.btn_1.Text = "1";
322            this.btn_1.Click += new System.EventHandler(this.btn_0_Click);
323            // 
324            // btn_6
325            // 
326            this.btn_6.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
327            this.btn_6.ForeColor = System.Drawing.Color.Blue;
328            this.btn_6.Location = new System.Drawing.Point(98, 80);
329            this.btn_6.Name = "btn_6";
330            this.btn_6.Size = new System.Drawing.Size(36, 29);
331            this.btn_6.TabIndex = 28;
332            this.btn_6.Tag = "6";
333            this.btn_6.Text = "6";
334            this.btn_6.Click += new System.EventHandler(this.btn_0_Click);
335            // 
336            // btn_5
337            // 
338            this.btn_5.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
339            this.btn_5.ForeColor = System.Drawing.Color.Blue;
340            this.btn_5.Location = new System.Drawing.Point(58, 80);
341            this.btn_5.Name = "btn_5";
342            this.btn_5.Size = new System.Drawing.Size(36, 29);
343            this.btn_5.TabIndex = 27;
344            this.btn_5.Tag = "5";
345            this.btn_5.Text = "5";
346            this.btn_5.Click += new System.EventHandler(this.btn_0_Click);
347            // 
348            // btn_4
349            // 
350            this.btn_4.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
351            this.btn_4.ForeColor = System.Drawing.Color.Blue;
352            this.btn_4.Location = new System.Drawing.Point(18, 80);
353            this.btn_4.Name = "btn_4";
354            this.btn_4.Size = new System.Drawing.Size(36, 29);
355            this.btn_4.TabIndex = 26;
356            this.btn_4.Tag = "4";
357            this.btn_4.Text = "4";
358            this.btn_4.Click += new System.EventHandler(this.btn_0_Click);
359            // 
360            // btn_sqrt
361            // 
362            this.btn_sqrt.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
363            this.btn_sqrt.ForeColor = System.Drawing.Color.Blue;
364            this.btn_sqrt.Location = new System.Drawing.Point(18, 16);
365            this.btn_sqrt.Name = "btn_sqrt";
366            this.btn_sqrt.Size = new System.Drawing.Size(76, 29);
367            this.btn_sqrt.TabIndex = 25;
368            this.btn_sqrt.Text = "sqrt";
369            this.btn_sqrt.Click += new System.EventHandler(this.btn_Oper);
370            // 
371            // btn_div
372            // 
373            this.btn_div.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
374            this.btn_div.ForeColor = System.Drawing.Color.Red;
375            this.btn_div.Location = new System.Drawing.Point(138, 48);
376            this.btn_div.Name = "btn_div";
377            this.btn_div.Size = new System.Drawing.Size(36, 29);
378            this.btn_div.TabIndex = 24;
379            this.btn_div.Text = "/";
380            this.btn_div.Click += new System.EventHandler(this.btn_Oper);
381            // 
382            // btn_7
383            // 
384            this.btn_7.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
385            this.btn_7.ForeColor = System.Drawing.Color.Blue;
386            this.btn_7.Location = new System.Drawing.Point(18, 48);
387            this.btn_7.Name = "btn_7";
388            this.btn_7.Size = new System.Drawing.Size(36, 29);
389            this.btn_7.TabIndex = 23;
390            this.btn_7.Tag = "7";
391            this.btn_7.Text = "7";
392            this.btn_7.Click += new System.EventHandler(this.btn_0_Click);
393            // 
394            // btn_8
395            // 
396            this.btn_8.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
397            this.btn_8.ForeColor = System.Drawing.Color.Blue;
398            this.btn_8.Location = new System.Drawing.Point(58, 48);
399            this.btn_8.Name = "btn_8";
400            this.btn_8.Size = new System.Drawing.Size(36, 29);
401            this.btn_8.TabIndex = 22;
402            this.btn_8.Tag = "8";
403            this.btn_8.Text = "8";
404            this.btn_8.Click += new System.EventHandler(this.btn_0_Click);
405            // 
406            // btn_9
407            // 
408            this.btn_9.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
409            this.btn_9.ForeColor = System.Drawing.Color.Blue;
410            this.btn_9.Location = new System.Drawing.Point(98, 48);
411            this.btn_9.Name = "btn_9";
412            this.btn_9.Size = new System.Drawing.Size(36, 29);
413            this.btn_9.TabIndex = 21;
414            this.btn_9.Tag = "9";
415            this.btn_9.Text = "9";
416            this.btn_9.Click += new System.EventHandler(this.btn_0_Click);
417            // 
418            // btn_sqr
419            // 
420            this.btn_sqr.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
421            this.btn_sqr.ForeColor = System.Drawing.Color.Blue;
422            this.btn_sqr.Location = new System.Drawing.Point(98, 16);
423            this.btn_sqr.Name = "btn_sqr";
424            this.btn_sqr.Size = new System.Drawing.Size(36, 29);
425            this.btn_sqr.TabIndex = 19;
426            this.btn_sqr.Text = "sqr";
427            this.btn_sqr.Click += new System.EventHandler(this.btn_Oper);
428            // 
429            // mainMenu1
430            // 
431            this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
432                                                                                      this.menuItem8,
433                                                                                      this.menuItem1,
434                                                                                      this.menuItem4});
435            // 
436            // menuItem1
437            // 
438            this.menuItem1.Index = 1;
439            this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
440                                                                                      this.menuItem2,
441                                                                                      this.menuItem3});
442            this.menuItem1.Text = "编辑(&E)";
443            // 
444            // menuItem2
445            // 
446            this.menuItem2.Index = 0;
447            this.menuItem2.Text = "复制(&C)";
448            this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);
449            // 
450            // menuItem3
451            // 
452            this.menuItem3.Index = 1;
453            this.menuItem3.Text = "粘贴(&P)";
454            this.menuItem3.Click += new System.EventHandler(this.menuItem3_Click);
455            // 
456            // menuItem4
457            // 
458            this.menuItem4.Index = 2;
459            this.menuItem4.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
460                                                                                      this.menuItem5,
461                                                                                      this.menuItem6});
462            this.menuItem4.Text = "帮助(&H)";
463            // 
464            // menuItem5
465            // 
466            this.menuItem5.Index = 0;
467            this.menuItem5.Text = "帮助主题(&H)";
468            this.menuItem5.Click += new System.EventHandler(this.menuItem5_Click);
469            // 
470            // menuItem6
471            // 
472            this.menuItem6.Index = 1;
473            this.menuItem6.Text = "关于(&A)";
474            this.menuItem6.Click += new System.EventHandler(this.menuItem6_Click);
475            // 
476            // menuItem8
477            // 
478            this.menuItem8.Index = 0;
479            this.menuItem8.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
480                                                                                      this.menuItem9,
481                                                                                      this.menuItem10});
482            this.menuItem8.Text = "文件(&F)";
483            // 
484            // menuItem9
485            // 
486            this.menuItem9.Index = 0;
487            this.menuItem9.Text = "打开windows计算器(&O)";
488            this.menuItem9.Click += new System.EventHandler(this.menuItem9_Click);
489            // 
490            // menuItem10
491            // 
492            this.menuItem10.Index = 1;
493            this.menuItem10.Text = "退出(&Q)";
494            this.menuItem10.Click += new System.EventHandler(this.menuItem10_Click);
495            // 
496            // Form1
497            // 
498            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
499            this.ClientSize = new System.Drawing.Size(278, 239);
500            this.Controls.Add(this.groupBox1);
501            this.Controls.Add(this.txtShow);
502            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;
503            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
504            this.MaximizeBox = false;
505            this.Menu = this.mainMenu1;
506            this.Name = "Form1";
507            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
508            this.Text = "计算器";
509            this.groupBox1.ResumeLayout(false);
510            this.ResumeLayout(false);
511
512        }
513        #endregion
514
515        各变量和常数的声明#region 各变量和常数的声明
516        public const int NULL = 0;      // 定义操作码
517        public const int ADD = 1;     //表示加
518        public const int SUB = 2;     //减
519        public const int MUL = 3;     //乘
520        public const int DIV = 4;    //除
521        public const int SQR = 5;    //求平方
522        public const int SQRT = 6;   //求平方根
523        public const int NODOT  = 0;     // 定义是否点击了小数点,0 为没点
524        public const int HASDOT = 1;
525        private double res = 0;         // 记录结果数
526        private double tmp = 0;         // 当前输入的操作数
527        private int opt = NULL;         // 记录操作码
528        private int dot = NODOT;    // 记录是否点击了小数点,0为没有点
529        private int num = 0;        // 记录输入操作数的个数
530        private int dotnum = 0;        // 记录小数点部分的个数        
531        string strOper;            //获取操作符
532        #endregion
533        /**//// <summary>
534        /// 应用程序的主入口点。
535        /// </summary>
536        [STAThread]
537        static void Main() 
538        {
539            Application.Run(new Form1());
540        }
541
542        /**//// <summary>
543        
544        获取操作数事件#region 获取操作数事件
545        //获取操作数事件
546        
547        private void btn_0_Click(object sender, System.EventArgs e)
548        {
549            System.Windows.Forms.Button btnTmp;
550            double i;
551
552            btnTmp = sender as System.Windows.Forms.Button;            
553            if (btnTmp != null)
554            {
555                if (dot == NODOT)
556                {
557                    // 没有点击小数点
558                    i = double.Parse(btnTmp.Tag.ToString()); //取用户自定义的控件关联数,并转换成double型
559                    tmp = tmp * 10 + i;
560                    txtShow.Text = tmp.ToString();   //将其放入文本显示屏啊
561                }
562                else   // 点击了小数点
563                {                    
564                    dotnum++;    //记录小数点部分的个数
565                                                       // 生成小数部分的新的数值
566                    i = double.Parse(btnTmp.Tag.ToString()) / System.Math.Pow(10,dotnum);
567                    tmp = tmp + i;  //将小数点后的值加到当前操做数
568                    txtShow.Text = tmp.ToString();
569                }
570            }
571        }
572        #endregion
573
574        等于事件和等于运算方法#region 等于事件和等于运算方法
575        //等于事件
576        private void btn_equ_Click(object sender, System.EventArgs e)
577        {
578            calc();
579        }
580
581        //等于运算方法
582        private void calc()
583        {
584            // 生成结果
585            if (num == 0 )    //是否有操作数,没有就返回0
586            {
587                res = 0;
588                tmp = 0;
589                txtShow.Text = res.ToString();
590                return;
591            }
592
593            switch (opt)  //找到对应的运算符进行计算
594            {
595                    // 加法
596                case ADD:
597                    res = res + tmp;                    
598                    break;
599                    // 减法
600                case SUB:
601                    res = res - tmp;                    
602                    break;
603                    // 乘法
604                case MUL:
605                    res = res * tmp;                    
606                    break;
607                    // 除法
608                case DIV:
609                    res = res / tmp;                    
610                    break;
611                    // 平方
612                case SQR:
613                    res = tmp * tmp;                    
614                    break;
615                    // 平方根
616                case SQRT:
617                    res = System.Math.Sqrt(tmp);                    
618                    break;
619                default:
620                    return;
621            }
622            txtShow.Text = res.ToString();   //结果输出到文本显示屏
623            opt = NULL;  //运算符清空
624            tmp=0;    
625            dot = NODOT;
626                    //res = 0;
627                    //num = 0;
628        }
629        #endregion
630
631        获取操作符运事件#region 获取操作符运事件
632        //获取操作符运事件
633        private void btn_Oper(object obj,EventArgs ea)
634        {
635            Button tmp1=(Button)obj;
636            strOper=tmp1.Text;
637            switch (strOper)
638            {
639                case "/":       //除法运算
640                    if(opt!=NULL&&opt!=DIV)
641                    {
642                        calc();
643                    }
644                    opt = DIV;
645                    if (num != 0)  //判断操作数的个数,如果两个就做二元运算
646                    {
647                        if (tmp != 0)
648                            res = res / tmp;
649                    }
650                    else
651                        res = tmp;
652                    num++;                      
653                    tmp = 0;
654                    txtShow.Text = res.ToString();
655                    dot = NODOT;
656                    break;
657                case "*":
658                    // 乘法运算
659                    if(opt!=NULL&&opt!=MUL)
660                    {
661                        calc();
662                    }
663
664                    opt = MUL;
665                    
666                    if (num!= 0 )     //判断操作数的个数,如果两个就做二元运算    
667                    {
668                            if(tmp!=0)
669                         res = res * tmp;
670                    }
671                    else
672                        res = tmp;
673                    
674                    num++;                                      
675                    tmp = 0;
676                    txtShow.Text = res.ToString();
677                    dot = NODOT;
678                    break;
679                case "+":            //加法运算
680                    if(opt!=NULL&&opt!=ADD)
681                    {
682                        calc();
683                    }
684                    opt = ADD;
685                    if (num != 0)    //判断操作数的个数,如果两个就做二元运算
686                        res = res + tmp;
687                    else
688                        res = tmp;
689                    num++;                    
690                    tmp = 0;
691                    txtShow.Text = res.ToString();
692                    dot = NODOT;
693                    break;
694                case "-":        //减法运算
695                    if(opt!=NULL&&opt!=SUB)
696                    {
697                        calc();
698                    }
699                    /**//*if(opt==ADD)
700                    {
701                        res=res+tmp;
702                        tmp=0;
703                    }*/
704                    opt = SUB;
705                    if (num != 0)    //判断操作数的个数,如果两个就做二元运算
706                        res = res - tmp;
707                    else
708                        res = tmp;
709                    num++;                     
710                    tmp = 0;
711                    txtShow.Text = res.ToString();
712                    dot = NODOT;
713                    break;
714                case "sqrt":     //平方根运算
715                    if(opt!=NULL)
716                    {
717                        calc();
718                    }
719
720                    //opt=SQRT;
721                    if (tmp > 0)  //要求操作数大于0
722                    {
723                        res = Math.Sqrt(tmp);
724                        //res=tmp;
725                    }
726                    else if(res>0)
727                        res= Math.Sqrt(res);
728                        txtShow.Text =res.ToString();
729                    num++;    
730                    tmp=0;
731                    dot = NODOT;
732                    break;
733                case "sqr":
734                    // 平方运算
735                    if(opt!=NULL)
736                    {
737                        calc();
738                    }
739                    //opt=SQR;
740                    if (tmp != 0)
741                    {
742                        res = tmp * tmp;
743                        //res=tmp;
744                    }
745                    else
746                        res=res*res;
747                    
748                    txtShow.Text = res.ToString();
749                    num++;    
750                    tmp=0;
751                    dot = NODOT;
752                    break;
753                case "1/x":  //倒数运算
754                    if(opt!=NULL)
755                    {
756                        calc();
757                    }
758                    if (tmp != 0)
759                    {
760                        res = 1 / tmp;
761                        //res=tmp;
762                    }
763                    else                    
764                    res=1/res;
765                    txtShow.Text = res.ToString();
766                    tmp=0;
767                    dot = NODOT;
768                    break;
769                case ".":
770                            // 点击了小数点
771                    if(dot==HASDOT)
772                        return;
773                    else
774                    {
775                        dot = HASDOT;
776                        dotnum = 0;
777                    }                    
778                    break;
779                case "+/-":
780                                // 点击了符号运算
781                    if(tmp!=0)
782                    {
783                        tmp = -tmp;
784                        txtShow.Text = tmp.ToString();
785                    }
786                    else
787                    {
788                        res=-res;
789                        //res=tmp;
790                        txtShow.Text = res.ToString();    
791                    }
792                    dot = NODOT;
793                    break;    
794                case "CE":     //清除运算
795                    res = 0;         // 记录结果数
796                    tmp = 0;         // 当前输入的操作数
797                    opt = NULL;         // 记录操作码
798                    dot = NODOT;    // 记录是否点击了小数点
799                    num = 0;        // 记录输入操作数的个数
800                    dotnum = 0;        // 记录小数点部分的个数
801                    txtShow.Text="";                    
802                    break;
803                case "C":         //清除运算
804                    res = 0;         // 记录结果数
805                    tmp = 0;         // 当前输入的操作数
806                    opt = NULL;         // 记录操作码
807                    dot = NODOT;    // 记录是否点击了小数点
808                    num = 0;        // 记录输入操作数的个数
809                    dotnum = 0;        // 记录小数点部分的个数
810                    txtShow.Text="";
811                    break;
812
813            }
814        }
815
816        #endregion
817
818        主菜单事件#region     主菜单事件
819        //打开关于主题---调用windows xp中计算器的帮助
820        private void menuItem5_Click(object sender, System.EventArgs e)
821        {
822            Help.ShowHelp(this,"C:\\WINDOWS\\Help\\calc.chm");        
823        }
824
825        
826
827        //打开于我们
828        private void menuItem6_Click(object sender, System.EventArgs e)
829        {
830            Form2 fm=new Form2();
831            fm.Show();
832            
833        }
834
835        //复制
836        private void menuItem2_Click(object sender, System.EventArgs e)
837        {
838            if(txtShow.SelectionLength>0)
839            {
840                txtShow.Copy();
841            }
842        }
843        //
844       //粘贴
845        private void menuItem3_Click(object sender, System.EventArgs e)
846        {
847            txtShow.Paste();
848        }
849       
850          //调用windows xp中的计算器
851        private void menuItem9_Click(object sender, System.EventArgs e)
852        {
853             Help.ShowHelp(this,"C:\\WINDOWS\\system32\\calc.exe");
854        }
855        //退出
856        private void menuItem10_Click(object sender, System.EventArgs e)
857        {
858            Application.Exit();
859        }
860
861        #endregion
862
863        
864    }
865}