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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.Windows.Forms;

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

        private void button1_Click(object sender, EventArgs e)
        {
            double a = Convert.ToDouble(textBox1.Text);
            double b = Convert.ToDouble(textBox2.Text);
            label3.Text = a " " b "=";
            label3.Text = a b;

        }

        private void button2_Click(object sender, EventArgs e)
        {
            double a = Convert.ToDouble(textBox1.Text);
            double b = Convert.ToDouble(textBox2.Text);
            label3.Text = a "-" b "=";
            label3.Text = a - b;

        }

        private void button3_Click(object sender, EventArgs e)
        {
            double a = Convert.ToDouble(textBox1.Text);
            double b = Convert.ToDouble(textBox2.Text);
            label3.Text = a "*" b "=";
            label3.Text = a * b;

        }

        private void button4_Click(object sender, EventArgs e)
        {
            double a = Convert.ToDouble(textBox1.Text);
            double b = Convert.ToDouble(textBox2.Text);
            label3.Text = a "/" b "=";
            label3.Text = a / b;

        }

        private void button5_Click(object sender, EventArgs e)
        {
            double a = Convert.ToDouble(textBox1.Text);
            double b = Convert.ToDouble(textBox2.Text);
            label3.Text = a "的" b "次方=";
            label3.Text = Math.Pow(a, b);

        }
    }