c# My计算器源码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 计算器
{
    class Calc
    {
        private double number1 = 0;  //第1个数
        private double number2 = 0;  //第2个数
        private double number3 = 0;  //结果
        public enum Sign { And, Substract, Multiply, Divide, Sign }  //加减乘除符号枚举
        
        public string Process { get; set; }  //计算记录
        
        public Calc()
        {

        }

        public double Number1
        {
            get { return number1; }
            set { number1 = value; }
        }
        public double Number2
        {
            get { return number2; }
            set { number2 = value; }
        }
        public double Number3
        {
            get { return number3; }
            set { number3 = value; }
        }

        public void Calc_method(Sign sign)
        {
            switch (sign)
            {
                case Sign.And:  //加法
                    number3 = number1 + number2;
                    break;
                case Sign.Divide: //除法
                    number3 = number1 / number2;
                    break;
                case Sign.Multiply: //乘法
                    number3 = number1 * number2;
                    break;
                case Sign.Substract: //减法
                    number3 = number1 - number2;
                    break;
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace 计算器
{
    public partial class MyCalc : Form
    {
        public MyCalc()
        {
            InitializeComponent();
        }
        Calc calc1;
        Calc.Sign sign1;
        public static string tmp = "0";
        public static bool booltag = false;
        
      
        private void MyCalc_Load(object sender, EventArgs e)
        {
            calc1 = new Calc();
            sign1 = new Calc.Sign();
        }

        private void btnSign_Click(object sender, EventArgs e)
        {
            string s = ((Button)sender).Tag.ToString();
            switch (s)
            {
                case "+":
                    processMethod(s);
                    sign1 = Calc.Sign.And;
                    break;
                case "-":
                    processMethod(s);
                    sign1 = Calc.Sign.Substract;
                    break;
                case "*":
                    processMethod(s);
                    sign1 = Calc.Sign.Multiply;
                    break;
                case "/":
                    processMethod(s);
                    sign1 = Calc.Sign.Divide;
                    break;
            }
        }

        private void processMethod(string s)
        {
            if (booltag)
            {
                calc1.Process = calc1.Process.Substring(0, calc1.Process.Length - 1) + s;  //改变运算符
            }
            else
            {
                if (sign1 == Calc.Sign.Divide && calc1.Number2 == 0)  //除数不能为零
                {
                    calc1.Process = calc1.Process.Substring(0, calc1.Process.Length - 1) + s;  //改变运算符
                    if (calc1.Number1 == 0)
                        txtDisplay.Text = "结果未定义";
                    else
                        txtDisplay.Text = "除数不能为零";
                    booltag = true;
                    return;
                }
                calc1.Process += calc1.Number2.ToString() + s;
                calc1.Calc_method(sign1); //计算
                calc1.Number1 = calc1.Number3;  //保存结果到1
            }
            txtProcess.Text = calc1.Process.ToString();  //显示记录
            txtDisplay.Text = calc1.Number3.ToString(); //显示结果
            booltag = true;
        }

        private void btn_Click(object sender, EventArgs e)
        {
            string s = ((Button)sender).Tag.ToString();
            if (s == "C")
            {
                calc1 = new Calc();
                sign1 = new Calc.Sign();
                tmp = "0";
                booltag = false;
                txtProcess.Text = "";  //显示记录
                txtDisplay.Text = "0"; //显示结果
                return;
            }
            if (s == "."&& tmp.IndexOf(".")!=-1)
            {
                return;
            }
            if (sign1 == Calc.Sign.Sign)
            {
                return;
            }
            if (s == "←")
            {
                int n = tmp.Length;
                if (n > 1)
                {
                    tmp = tmp.Substring(0, n - 1);
                    calc1.Number2 = Convert.ToDouble(tmp);
                    txtDisplay.Text = calc1.Number2.ToString();  //显示输入
                }
                return;
            }
            if (s == "CE")
            {
                tmp = "0";
                calc1.Number2 = Convert.ToDouble(tmp);
                txtDisplay.Text = calc1.Number2.ToString();  //显示输入
                return;
            }
            if (booltag) //按过运算符
            {
                tmp = "0";
                booltag = false;
            }
            tmp = tmp + s;
            calc1.Number2 = Convert.ToDouble(tmp);
            txtDisplay.Text = calc1.Number2.ToString();  //显示输入
        }

        private void btnSign_Click_1(object sender, EventArgs e)
        {
            if (booltag == false)
            {
                if (sign1 == Calc.Sign.Divide && calc1.Number2 == 0)  //除数不能为零
                {
                    if (calc1.Number1 == 0)
                        txtDisplay.Text = "结果未定义";
                    else
                        txtDisplay.Text = "除数不能为零";
                }
                else
                {
                    if (sign1 != Calc.Sign.Sign)
                    {
                        calc1.Process += calc1.Number2.ToString() + "=";
                        calc1.Calc_method(sign1); //计算
                        calc1.Number1 = calc1.Number3;  //保存结果到1
                        txtProcess.Text = calc1.Process.ToString();  //显示记录
                        txtDisplay.Text = calc1.Number3.ToString(); //显示结果
                        sign1 = Calc.Sign.Sign;
                    }
                }
                booltag = true;
            }
        }
    }
}