C# 计算器窗体程序
本文共 7806 字，大约阅读时间需要 26 分钟。
目录
功能设计
1、计算器中，添加 0-9 共十个数字键。
2、计算器中，增添 加、减、乘、除、等于五个功能键。
3、计算器中，增加四个功能键：x2，sqrt，log, ln 四个键，分别计算求平方，开方。
实现代码
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 test3_1{ public partial class Form1 : Form { double result = 0; //存储计算结果 double number = 0; //存储输入的数字 bool exist_value = false; //判断文本框中是否有值 string operation; //存储输入的运算符 /* * 初始化 */ public Form1() { InitializeComponent(); } /* * 数字键触发事件实现 */ private void Seven_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "7"; } private void Eight_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "8"; } private void Nine_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "9"; } private void Four_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "4"; } private void Five_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "5"; } private void Six_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "6"; } private void One_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "1"; } private void Two_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "2"; } private void Three_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "3"; } private void Zero_Click(object sender, EventArgs e) { if (exist_value == true) { textBox1.Text = ""; exist_value = false; } textBox1.Text += "0"; } /* * 功能键触发事件 */ private void Add_Click(object sender, EventArgs e) { if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { exist_value = true; number = double.Parse(textBox1.Text); operation = "+"; } } private void Sub_Click(object sender, EventArgs e) { if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { exist_value = true; number = double.Parse(textBox1.Text); operation = "-"; } } private void Mul_Click(object sender, EventArgs e) { if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { exist_value = true; number = double.Parse(textBox1.Text); operation = "*"; } } private void Div_Click(object sender, EventArgs e) { if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { exist_value = true; number = double.Parse(textBox1.Text); operation = "/"; } } private void Squ_Click(object sender, EventArgs e) { if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { exist_value = true; number = double.Parse(textBox1.Text); operation = "x^2"; } } private void Sqrt_Click(object sender, EventArgs e) { if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { exist_value = true; number = double.Parse(textBox1.Text); operation = "sqrt"; } } private void Log_Click(object sender, EventArgs e) { if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { exist_value = true; number = double.Parse(textBox1.Text); operation = "log"; } } private void Ln_Click(object sender, EventArgs e) { if (textBox1.Text == "") { MessageBox.Show("请先输入值再计算！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { exist_value = true; number = double.Parse(textBox1.Text); operation = "ln"; } } private void Del_Click(object sender, EventArgs e) { textBox1.Text = ""; } private void Equ_Click(object sender, EventArgs e) { switch (operation) { case "+": result = number + double.Parse(textBox1.Text); break; case "-": result = number - double.Parse(textBox1.Text); break; case "*": result = number * double.Parse(textBox1.Text); break; case "/": { double temp=double.Parse(textBox1.Text); if (temp != 0) result = number / temp; else MessageBox.Show("除数不能为零", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); break; } case "x^2": result = number * number; break; case "sqrt": result = Math.Sqrt(number); break; case "log": result = Math.Log10(number); break; case "ln": result = Math.Log(number); break; } textBox1.Text = result + ""; exist_value = true; } }} 界面设计
运行结果
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