目录
功能设计实现代码界面设计运行结果功能设计
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 ponentModel;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;elseMessageBox.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
进阶版地址：
C# 计算器窗体程序（进阶版）
