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   源码介绍

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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 计算器
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        double num1;
        double num2;
        double yunsuan = 0;
        double result;
        bool DecimalFlag = false;
        bool OperatorFlag = false;
        string Operate;
        public void NumClick(double num)   //数字处理方法
        {
            if (!OperatorFlag)
            {
                if (DecimalFlag)
                {
                    textBox1.Text = textBox1.Text   num;
                }
                else
                {
                    if (textBox1.Text == "0")
                    {
                        textBox1.Text = num   "";
                    }
                    else
                    {
                        textBox1.Text = textBox1.Text   num;
                    }
                }
                OperatorFlag = false;
            }
            else
                textBox1.Text = num.ToString();
                OperatorFlag = false;
        }





    private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.ReadOnly = true;
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            textBox1.BackColor = Color.White;
        }

        private void button18_Click(object sender, EventArgs e)    //清空键C
        {
            num1 = 0;
            num2 = 0;
            yunsuan = 0;
            textBox1.Text = "0";
            DecimalFlag = false;
            OperatorFlag = false;
         }

        private void button1_Click(object sender, EventArgs e)   //数字键0
        {
            NumClick(0);
        }

        private void button3_Click(object sender, EventArgs e)   //数字键1
        {
            NumClick(1);
        }

        private void button4_Click(object sender, EventArgs e)   //数字键2
        {
            NumClick(2);
        }

        private void button5_Click(object sender, EventArgs e)   //数字键3
        {
            NumClick(3);
        }

        private void button6_Click(object sender, EventArgs e)   //数字键4
        {
            NumClick(4);
        }

        private void button7_Click(object sender, EventArgs e)   //数字键5
        {
            NumClick(5);
        }

        private void button8_Click(object sender, EventArgs e)   //数字键6
        {
            NumClick(6);
        }

        private void button9_Click(object sender, EventArgs e)   //数字键7
        {
            NumClick(7);
        }

        private void button10_Click(object sender, EventArgs e)   //数字键8
        {
            NumClick(8);
        }

        private void button11_Click(object sender, EventArgs e)   //数字键9
        {
            NumClick(9);
        }

        private void button2_Click(object sender, EventArgs e)   //小数点
        {
            if (!DecimalFlag)
                textBox1.Text = textBox1.Text   ".";
            else
                textBox1.Text = textBox1.Text   "";
                DecimalFlag = true;
        }

        private void button12_Click(object sender, EventArgs e)   //加号
        {
            OperatorFlag = true;
            Operate = "add";
            if (yunsuan == 0)
            {
                num1 = double.Parse(textBox1.Text);
                textBox1.Text = num1.ToString();
            }
            else
            {
                num2 = double.Parse(textBox1.Text);
                {
                    if (yunsuan == 1)
                        num1 = num1   num2;
                    else if (yunsuan == 2)
                        num1 = num1 - num2;
                    else if (yunsuan == 3)
                        num1 = num1 * num2;
                    else
                        num1 = num1 / num2;
                }
                textBox1.Text = num1.ToString();
            }
            yunsuan = 1;
            DecimalFlag = false;
        }

        private void button13_Click(object sender, EventArgs e)   //减号
        {
            OperatorFlag = true;
            Operate = "minus";
            if (yunsuan == 0)
            {
                num1 = double.Parse(textBox1.Text);
                textBox1.Text = num1.ToString();
            }
            else
            {
                num2 = double.Parse(textBox1.Text);
                {
                    if (yunsuan == 1)
                        num1 = num1   num2;
                    else if (yunsuan == 2)
                        num1 = num1 - num2;
                    else if (yunsuan == 3)
                        num1 = num1 * num2;
                    else
                        num1 = num1 / num2;
                }
                textBox1.Text = num1.ToString();
            }
            yunsuan = 2;
            DecimalFlag = false;
        }

        private void button14_Click(object sender, EventArgs e)   //乘号
        {
            OperatorFlag = true;
            Operate = "multiply";
            if (yunsuan == 0)
            {
                num1 = double.Parse(textBox1.Text);
                textBox1.Text = num1.ToString();
            }
            else
            {
                num2 = double.Parse(textBox1.Text);
                {
                    if (yunsuan == 1)
                        num1 = num1   num2;
                    else if (yunsuan == 2)
                        num1 = num1 - num2;
                    else if (yunsuan == 3)
                        num1 = num1 * num2;
                    else
                        num1 = num1 / num2;
                }
                textBox1.Text = num1.ToString();
            }
            yunsuan = 3;
            DecimalFlag = false;
        }

        private void button15_Click(object sender, EventArgs e)   //除号
        {
            OperatorFlag = true;
            Operate = "divide";
            if (yunsuan == 0)
            {
                num1 = double.Parse(textBox1.Text);
                textBox1.Text = num1.ToString();
            }
            else
            {
                num2 = double.Parse(textBox1.Text);
                {
                    if (yunsuan == 1)
                        num1 = num1   num2;
                    else if (yunsuan == 2)
                        num1 = num1 - num2;
                    else if (yunsuan == 3)
                        num1 = num1 * num2;
                    else
                        num1 = num1 / num2;
                }
                textBox1.Text = num1.ToString();
            }
            yunsuan = 4;
            DecimalFlag = false;
        }

        private void button16_Click(object sender, EventArgs e)   //等号
        {
            num2 = double.Parse(textBox1.Text);
            switch (Operate)
            {
                case "add":
                    result = num1   num2;
                    textBox1.Text = result.ToString();
                    break;
                case "minus":
                    result = num1 - num2;
                    textBox1.Text = result.ToString();
                    break;
                case "multiply":
                    result = num1 * num2;
                    textBox1.Text = result.ToString();
                    break;
                case "divide":
                    if (num2 == 0)
                    {
                        textBox1.Text = "除数不能为0";
                    }
                    else
                    {
                        result = num1 / num2;
                        textBox1.Text = result.ToString();
                    }
                    break;
            }
            OperatorFlag = true;
            yunsuan = 0;
        }

        private void button17_Click(object sender, EventArgs e)   //退格键
        {
            if (textBox1.Text == ""|| textBox1.Text=="0" || textBox1.Text.Length==1)
                textBox1.Text = "0";
            else
                textBox1.Text = textBox1.Text.Substring(0, textBox1.Text.Length - 1);
        }
    }
}