用visual studio编写计算器程序的代码

以下是使用 Visual Studio 编写计算器程序的 C# 代码示例：

using System;
using System.Windows.Forms;

namespace Calculator
{
    public partial class Form1 : Form
    {
        double num1 = 0, num2 = 0, result = 0;
        char op = ' ';

        public Form1()
        {
            InitializeComponent();
        }

        private void button_Click(object sender, EventArgs e)
        {
            Button btn = (Button)sender;
            if (textBox.Text == "0" && btn.Text != ".")
            {
                textBox.Clear();
            }
            if (btn.Text == ".")
            {
                if (!textBox.Text.Contains("."))
                {
                    textBox.Text += btn.Text;
                }
            }
            else
            {
                textBox.Text += btn.Text;
            }
        }

        private void op_Click(object sender, EventArgs e)
        {
            Button btn = (Button)sender;
            op = btn.Text[0];
            num1 = double.Parse(textBox.Text);
            textBox.Clear();
        }

        private void equals_Click(object sender, EventArgs e)
        {
            num2 = double.Parse(textBox.Text);
            switch (op)
            {
                case '+':
                    result = num1 + num2;
                    break;
                case '-':
                    result = num1 - num2;
                    break;
                case '*':
                    result = num1 * num2;
                    break;
                case '/':
                    result = num1 / num2;
                    break;
            }
            textBox.Text = result.ToString();
            num1 = result;
        }

        private void clear_Click(object sender, EventArgs e)
        {
            textBox.Text = "0";
            num1 = 0;
            num2 = 0;
            op = ' ';
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            switch (e.KeyCode)
            {
                case Keys.NumPad0:
                case Keys.D0:
                    button0.PerformClick();
                    break;
                case Keys.NumPad1:
                case Keys.D1:
                    button1.PerformClick();
                    break;
                case Keys.NumPad2:
                case Keys.D2:
                    button2.PerformClick();
                    break;
                case Keys.NumPad3:
                case Keys.D3:
                    button3.PerformClick();
                    break;
                case Keys.NumPad4:
                case Keys.D4:
                    button4.PerformClick();
                    break;
                case Keys.NumPad5:
                case Keys.D5:
                    button5.PerformClick();
                    break;
                case Keys.NumPad6:
                case Keys.D6:
                    button6.PerformClick();
                    break;
                case Keys.NumPad7:
                case Keys.D7:
                    button7.PerformClick();
                    break;
                case Keys.NumPad8:
                case Keys.D8:
                    button8.PerformClick();
                    break;
                case Keys.NumPad9:
                case Keys.D9:
                    button9.PerformClick();
                    break;
                case Keys.Add:
                    buttonAdd.PerformClick();
                    break;
                case Keys.Subtract:
                    buttonSubtract.PerformClick();
                    break;
                case Keys.Multiply:
                    buttonMultiply.PerformClick();
                    break;
                case Keys.Divide:
                    buttonDivide.PerformClick();
                    break;
                case Keys.Decimal:
                    buttonDecimal.PerformClick();
                    break;
                case Keys.Enter:
                    buttonEquals.PerformClick();
                    break;
                case Keys.Delete:
                    buttonClear.PerformClick();
                    break;
                default:
                    break;
            }
        }
    }
}

在 Visual Studio 中，可以使用 Windows 窗体应用程序模板创建一个新项目，然后将上述代码复制到 Form1.cs 文件中。