C#_最基础的计算器

暑假作业之一——用C#写一个最基本功能的计算器

我参照了Win10自带的计算器进行了设计和计算规则的编写（如图）

写完忽然想到——按完+号再按±会有什么反应？

8+6+negative(14)

改改改

那……直接按等于号呢？

2+=    4    

也就是加最开始的2？

2+3+  =   10  

不对，是加“目前的数”，也就是显示在下面窗口的数字

改改改

然后我妹妹来玩，对着最开始的零±±±±±±±±±±±±±±±崩了

改改改

 然后把MR、MC、M+设置为不可多难过除非按了MS，在这些按键上增添鼠标悬浮时显示提示信息……

以上……但愿没bug了

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

namespace Caculator
{
    public partial class Form1 : Form
    {
        int f1, f2, f3, f4, f5,top=-1;//标记
        double left, right;//记录左右数字
        String MS, negate;//MS储存内容，negate用于正负号的操作
        Char symbol;//记录运算符
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)//窗体程序运行前执行
        {
            this.textBox1.Text = Convert.ToString(0);
            f1 = 0;//符号数字，是否有符号在数字前，数字在符号前，1为是，下同
            f2 = 0;//总第一个符号
            f3 = 0;//第一个等号
            f4 = 0;//是否按了=
            f5 = 0;//是否按了“+/-”，按其他符号则还原为0
            left = 0;
            right = 0;
            this.button9.Enabled = false;
            this.button19.Enabled = false;
            this.button14.Enabled = false;
            this.toolTip1.SetToolTip(this.button3, "清除");//提示信息
            this.toolTip1.SetToolTip(this.button2, "取消");
            this.toolTip1.SetToolTip(this.button8, "存入储存");
            this.toolTip1.SetToolTip(this.button9, "读取读取");
            this.toolTip1.SetToolTip(this.button14, "清除储存");
            this.toolTip1.SetToolTip(this.button19, "在存储上加上");
        }
        private void button1_Click(object sender, EventArgs e)//'='
        {
            this.textBox2.Clear();
            if (f3 == 0)//第一次按等于号时，连续按等于号即右操作数不变，不断与左操作数进行运算操作
            {
                right = Convert.ToDouble(textBox1.Text);
                f3 = 1;
            }
            if (f2 == 1)//按完运算符直接按等于号，2+3+=，计算为与自身相加2+3+(2+3)=
            {
                if (symbol == '+')
                {
                    left += right;
                }
                if (symbol == '-')
                {
                    left -= right;
                }
                if (symbol == '*')
                {
                    left *= right;
                }
                if (symbol == '/')
                {
                    left /= right;
                }
            }
            else
            {
                left = right;
                f2 = 1;
            }
            this.textBox1.Text = Convert.ToString(left);
            f4 = 1;
        }

        private void button2_Click(object sender, EventArgs e)//CE清空当前值
        {
            this.textBox1.Text = "0";
        }

        private void button3_Click(object sender, EventArgs e)//C全部清空
        {
            this.textBox1.Text= "0";
            textBox2.Clear();
            left = 0;
            right = 0;
            f1 = 0;
            f2 = 0;
            f3 = 0;
            f4 = 0;
            f5 = 0;
        }
        private void button4_Click(object sender, EventArgs e)//除法符号
        {
            if (f4 == 1)//按等于号后直接按运算符，将运算结果记为左操作数，对标记进行还原
            {
                f2 = 0;
                f3 = 0;
                f4 = 0;
            }
            if (f1 == 0)//运算符前有数字，连续输入运算符，理解为更改运算符，以最后一个为准
            {
                right = Convert.ToDouble(textBox1.Text);//将数字记为右操作数
                this.textBox2.Text = this.textBox2.Text + this.textBox1.Text + "/";//窗口2显示总算式
                
                if (f2 == 1)//按这个运算符时，对上一个运算符进行计算
                {
                    if (symbol == '+')
                    {
                        left += right;
                    }
                    if (symbol == '-')
                    {
                        left -= right;
                    }
                    if (symbol == '*')
                    {
                        left *= right;
                    }
                    if (symbol == '/')
                    {
                        left /= right;
                    }
                }
                else//第一个运算符不进行运算操作
                {
                    left = right;
                    f2 = 1;
                }
                this.textBox1.Text = Convert.ToString(left);//将计算结果显示到窗口一
            }
            else if (f2 == 1)
            { 
                this.textBox2.Text = this.textBox2.Text.Remove(this.textBox2.Text.Length - 1);
                this.textBox2.Text = this.textBox2.Text + "/";
            }
            symbol = '/';//记录当前运算符（未经性计算）
            f1 = 1;
            negate = Convert.ToString(left);
            f5 = 0;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            input(9,e);//使用input函数进行输入操作，下同
        }

        private void button6_Click(object sender, EventArgs e)
        {
            input(8,e);
        }

        private void button7_Click(object sender, EventArgs e)
        {
            input(7,e);
        }

        private void button8_Click(object sender, EventArgs e)//MS，储存当前数字，并允许使用MR，M+，MC
        {
            MS = this.textBox1.Text;
            this.button9.Enabled = true;
            this.button19.Enabled = true;
            this.button14.Enabled = true;
        }
        private void button9_Click(object sender, EventArgs e)//MR，将当前数字变为储存的数字
        {
            f1 = 0;//相当于输入了数字，f1记为0
            this.textBox1.Text = MS;
        }

        private void button10_Click(object sender, EventArgs e)
        {
            input(4,e);
        }

        private void button11_Click(object sender, EventArgs e)
        {
            input(5,e);
        }

        private void button12_Click(object sender, EventArgs e)
        {
            input(6,e);
        }

        private void button13_Click(object sender, EventArgs e)//乘法，详细注释同除法
        {
            if (f4 == 1)
            {
                f2 = 0;
                f3 = 0;
                f4 = 0;
            }

            if (f1 == 0)
            {
                right = Convert.ToDouble(textBox1.Text);
                this.textBox2.Text = this.textBox2.Text + this.textBox1.Text + "*";
                
                if (f2 == 1)
                {
                    if (symbol == '+')
                    {
                        left += right;
                    }
                    if (symbol == '-')
                    {
                        left -= right;
                    }
                    if (symbol == '*')
                    {
                        left *= right;
                    }
                    if (symbol == '/')
                    {
                        left /= right;
                    }
                }
                else
                {
                    left = right;
                    f2 = 1;
                }
                this.textBox1.Text = Convert.ToString(left);
            }
            else if (f2 == 1)
            {
                this.textBox2.Text = this.textBox2.Text.Remove(this.textBox2.Text.Length - 1);
                this.textBox2.Text = this.textBox2.Text + "*";
            }
            symbol = '*';
            f1 = 1;
            negate = Convert.ToString(left);
            f5 = 0;
        }

        private void button14_Click(object sender, EventArgs e)//MC，清空储存，并禁止MR，M+，MC
        {
            MS = "";
            this.button9.Enabled = false;
            this.button19.Enabled = false;
            this.button14.Enabled = false;
        }

        private void button15_Click(object sender, EventArgs e)
        {

            input(1,e);
        }

        private void button16_Click(object sender, EventArgs e)
        {

            input(2,e);
        }

        private void button17_Click(object sender, EventArgs e)
        {
            input(3,e);
        }

        private void button18_Click(object sender, EventArgs e)//减法，详细注释同除法
        {
            if (f4 == 1)
            {
                f2 = 0;
                f3 = 0;
                f4 = 0;
            }

            if (f1 == 0)
            {
                right = Convert.ToDouble(textBox1.Text);
                this.textBox2.Text = this.textBox2.Text + this.textBox1.Text + "-";
                
                if (f2 == 1)
                {
                    if (symbol == '+')
                    {
                        left += right;
                    }
                    if (symbol == '-')
                    {
                        left -= right;
                    }
                    if (symbol == '*')
                    {
                        left *= right;
                    }
                    if (symbol == '/')
                    {
                        left /= right;
                    }
                }
                else 
                {
                    left = right;
                    f2 = 1;
                }
                this.textBox1.Text = Convert.ToString(left);
            }
            else if(f2==1)
            {
                this.textBox2.Text = this.textBox2.Text.Remove(this.textBox2.Text.Length - 1);
                this.textBox2.Text = this.textBox2.Text + "-";
            }
            f1 = 1;
            symbol = '-';
            negate = Convert.ToString(left);
            f5 = 0;
        }

        private void button19_Click(object sender, EventArgs e)//M+将当前数字与储存的数字相加，并储存
        {
            MS = Convert.ToString(Convert.ToDouble(MS) + Convert.ToDouble(this.textBox1.Text));
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            //窗口一，当前数字
        }


        private void toolTip1_Popup(object sender, PopupEventArgs e)
        {
            
        }

        private void button20_Click(object sender, EventArgs e)//负号，将当前数字变为相反数
                                                               /*如果在运算符之后按，将当前数字的相反数作为右操作数
                                                                * 例：2+3+(+/-)等于2+3+（-（2+3））即为2+3+（-（5））
                                                                * 例：2+3+(+/-)(+/-)即为2+3+（-(-（5）)）
                                                                * 在计算器中记为2+3+negate(negate(5))
                                                                * 此时如果输入数字，则将替换这个数字
                                                                * 例：2+3+(+/-)即为2+3+（-（5）），输入6，变为2+3+6
                                                                 */
        {
            
            if (f1==1)
            {
                if (f5 == 0)
                {
                    textBox2.Text = textBox2.Text + negate;
                    right = left;
                }
                right *= -1;
                textBox2.Text = textBox2.Text.Remove(textBox2.Text.Length - negate.Length);
                negate = "negate(" + negate + ")";
                textBox2.Text = textBox2.Text + negate;
                
            }
            if (textBox1.Text.IndexOf("-") < 0)
            {
                textBox1.Text = "-" + textBox1.Text;
            }
            else
            {
                textBox1.Text = textBox1.Text.Replace("-", String.Empty);
            }
            f5 = 1;
        }

        private void button21_Click(object sender, EventArgs e)
        {

            input(0,e);
        }

        private void button22_Click(object sender, EventArgs e)//小数点，如果前面没有数字，自动补充0，记为“0.”
        {
            if (f4 == 1)
            {
                button3_Click(this, e);
            }
            if (this.textBox1.Text.IndexOf('.') < 0)
            {
                if (f1==0) this.textBox1.Text = this.textBox1.Text + ".";
                else this.textBox1.Text ="0.";
            }
            f1 = 0;
            if (f5 == 1)
            {
                textBox2.Text = textBox2.Text.Remove(textBox2.Text.Length - negate.Length);
            }
            f5 = 0;
        }

        private void button23_Click(object sender, EventArgs e)//加号，详细注释同除法
        {

            if (f4 == 1)
            {
                f2 = 0;
                f3 = 0;
                f4 = 0;
            }
            if (f1==0)
            {
                right = Convert.ToDouble(textBox1.Text);
                this.textBox2.Text = this.textBox2.Text+this.textBox1.Text + "+";
                if (f2 == 1)
                {
                    if (symbol == '+')
                    {
                        left += right;
                    }
                    if (symbol == '-')
                    {
                        left -= right;
                    }
                    if (symbol == '*')
                    {
                        left *= right;
                    }
                    if (symbol == '/')
                    {
                        left /= right;
                    }
                }
                else
                {
                    left = right;
                    f2 = 1;
                }
                this.textBox1.Text = Convert.ToString(left);
                
            }
            else if (f2 == 1)
            {
                this.textBox2.Text=this.textBox2.Text.Remove(this.textBox2.Text.Length - 1);
                this.textBox2.Text = this.textBox2.Text + "+";
            }
            symbol = '+';
            f1 = 1;
            negate = Convert.ToString(left);
            f5 = 0;
        }

       

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
            //窗口二，总算式
        }
        private void input(int num, EventArgs e)//输入函数
        {
            if (textBox1.Text.Length <= 16)//最大允许16位
            {
                if (f4 == 1)//等于号之后输入数字，相当于先按C，清零
                {
                    button3_Click(this, e);
                }
                if (f1 == 0 && this.textBox1.Text != "0") this.textBox1.Text = this.textBox1.Text + Convert.ToString(num);
                else this.textBox1.Text = Convert.ToString(num);
                f1 = 0;
                if (f5 == 1&&textBox2.Text.Length!=0)//替换negate内容，详见负号
                {
                    textBox2.Text = textBox2.Text.Remove(textBox2.Text.Length - negate.Length);
                }
                f5 = 0;
            }
        }
    }
}