C#桌面应用制作计算器

C#桌面应用制作简易计算器，可实现数字之间的加减乘除、AC按键清屏、Del按键清除末尾数字、+/-按键取数字相反数、%按键使数字缩小100倍、=按键显示运算结果等......

页面实现效果

功能实现

布局

计算器主体使用Panel容器，然后将button控件排列放置Panel容器做为计算器按键，显示主体使用groudBox容器，然后在groudBox容器里放置一个Panel容器作为显示屏，再在Panel容器放置一个label控件用于显示输入和运算结果。

布局效果

数字按键功能

点击数字按键使其数字投射到计算器平面上，因为屏幕大小有限，所以使其数字长度大于16时，字体缩小一倍，数字长度大于30时，弹窗提示"字符长度超出范围"。

数字按键功能实现效果

数字按键功能实现代码

 private void button8_Click(object sender, EventArgs e){string seven = "7";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;//如果前面有运算符，则先消除运算符再把数字投射到屏幕上}label1.Text = label1.Text + seven;//将数字投射到屏幕上if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}

运算符按键功能

如果在输入运算符前未输入数字，则弹窗提示"无运算数字"；如果输入运算符前已经输入数字且symbol（运算符）为null，则清除已经输入的并且投射到屏幕上的数字并将其赋值至num1，然后将运算符赋值给symbol并投射到屏幕上；如果输入运算符前屏幕上已经显示了输入的运算符，则弹窗提示"您已输入运算符"；如果输入运算符前已经输入数字且symbol（运算符）已被赋值，则清除已经输入的并且投射到屏幕上的数字并将其赋值至num2并计算num1 运算符 num2结果并将其赋值至num1，然后将运算符赋值给symbol并投射到屏幕上。

运算符按键功能实现效果

运算符按键功能实现代码

 private void button4_Click(object sender, EventArgs e){string divide = "÷";if (symbol == null && label1.Text.Length<1&&num1==null){MessageBox.Show("无运算数字");}else{if (symbol == null){if(num1 == null){num1 = label1.Text;}symbol = divide;label1.Text = symbol;}else{if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷") {MessageBox.Show("您已输入运算符");}else{num2 = label1.Text;rt = double.Parse(num1) / double.Parse(num2);num1 = rt.ToString();symbol = divide;label1.Text = symbol;num2 = null;}}}}

AC按键功能

点击清除所有信息。

AC按键功能实现效果

AC按键功能实现代码

 private void button1_Click(object sender, EventArgs e){label1.Text = null;num1=null;num2=null;symbol = null;}

Del按键功能

点击清除末尾字符，如果屏幕上末尾字符显示的是输入的运算符，则点击后清除运算符并把num1的值投射到屏幕上。

Del按键功能实现效果

Del按键功能实现代码

private void button2_Click(object sender, EventArgs e)
{if (label1.Text.Length == 0){label1.Text = null;}else{if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = num1;symbol = null;}else{string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1);if (label1.Text.Length < 30){if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}}}
}

+/-按键功能

点击取屏幕上数字的相反数并投射到屏幕上；但是如果点击+/-按键时屏幕上没有数字或屏幕上为运算符，则按键提示"error"（按键‘.’同样效果）。

+/-按键功能实现效果

+/-按键功能实现代码

private void button3_Click(object sender, EventArgs e)
{if (label1.Text.Length == 0){MessageBox.Show("error");}else if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{double reserve = double.Parse(label1.Text);reserve = -reserve;label1.Text = reserve.ToString();}
}

%按键功能

点击实现屏幕上数字缩小一百倍效果并将结果投射到屏幕上，但是如果点击%按键时屏幕上没有数字或屏幕上为运算符，则按键提示"error"。

%按键功能实现效果

%按键功能实现代码

private void button20_Click(object sender, EventArgs e)
{if (label1.Text.Length == 0){MessageBox.Show("error");}else if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{double reserve = double.Parse(label1.Text);reserve = reserve / 100;label1.Text = reserve.ToString();}
}

等号按键功能

点击实现运算效果并将最终结果输出到屏幕上；如果在输入等号前输入数字但是未输入运算符，屏幕显示字符保持原来不变，不进行运算；如果在输入等号前未输入数字也未输入运算符，则弹窗提示"无运算数字"；如果只输入一个数字和一个运算符，则弹窗提示"error"。

等号按键功能实现效果

等号按键功能实现代码

 private void button17_Click(object sender, EventArgs e){if (symbol == null && label1.Text.Length < 1){MessageBox.Show("无运算数字");}else{if (symbol == null){num1 = label1.Text;}else{if (label1.Text != null){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{num2 = label1.Text;}}}}if (num2 != null){if (symbol == "+"){rt = double.Parse(num1) + double.Parse(num2);label1.Text = rt.ToString();num1 = rt.ToString();symbol = null;num2 = null;}else if (symbol == "-"){rt = double.Parse(num1) - double.Parse(num2);label1.Text = rt.ToString();num1 = rt.ToString();symbol = null;num2 = null;}else if (symbol == "×"){rt = double.Parse(num1) * double.Parse(num2);label1.Text = rt.ToString();num1 = rt.ToString();symbol = null;num2 = null;}else if (symbol == "÷"){rt = double.Parse(num1) / double.Parse(num2);label1.Text = rt.ToString();num1 = rt.ToString();symbol = null;num2 = null;}}}

完整代码实现

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 WindowsFormsApp计算器
{public partial class Form1 : Form{string symbol, num1, num2,Num1,Num2;double rt;public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){label1.Text = null;num1=null;num2=null;symbol = null;}private void button2_Click(object sender, EventArgs e){if (label1.Text.Length == 0){label1.Text = null;}else{if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = num1;symbol = null;}else{string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1);if (label1.Text.Length < 30){if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}}}}private void button3_Click(object sender, EventArgs e){if (label1.Text.Length == 0){MessageBox.Show("error");}else if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{double reserve = double.Parse(label1.Text);reserve = -reserve;label1.Text = reserve.ToString();}}private void button4_Click(object sender, EventArgs e){string divide = "÷";if (symbol == null && label1.Text.Length<1&&num1==null){MessageBox.Show("无运算数字");}else{if (symbol == null){if(num1 == null){num1 = label1.Text;}symbol = divide;label1.Text = symbol;}else{if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷") {MessageBox.Show("您已输入运算符");}else{num2 = label1.Text;rt = double.Parse(num1) / double.Parse(num2);num1 = rt.ToString();symbol = divide;label1.Text = symbol;num2 = null;}}}}private void button8_Click(object sender, EventArgs e){string seven = "7";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;//如果前面有运算符，则先消除运算符再把数字投射到屏幕上}label1.Text = label1.Text + seven;//将数字投射到屏幕上if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button7_Click(object sender, EventArgs e){string eight = "8";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;}label1.Text = label1.Text + eight;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button6_Click(object sender, EventArgs e){string nine = "9";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;}label1.Text = label1.Text + nine;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button5_Click(object sender, EventArgs e){string multiply = "×";if (symbol == null && label1.Text.Length < 1 && num1 == null){MessageBox.Show("无运算数字");}else{if (symbol == null){if (num1 == null){num1 = label1.Text;}symbol = multiply;label1.Text = symbol;}else{if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("您已输入运算符");}else{num2 = label1.Text;rt = double.Parse(num1) * double.Parse(num2);num1 = rt.ToString();symbol = multiply;label1.Text = symbol;num2 = null;}}}}private void button12_Click(object sender, EventArgs e){string four = "4";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;}label1.Text = label1.Text + four;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button11_Click(object sender, EventArgs e){string five = "5";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;}label1.Text = label1.Text + five;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button10_Click(object sender, EventArgs e){string six = "6";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;}label1.Text = label1.Text + six;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button9_Click(object sender, EventArgs e){string subtract = "-";if (symbol == null && label1.Text.Length < 1 && num1 == null){MessageBox.Show("无运算数字");}else{if (symbol == null){if (num1 == null){num1 = label1.Text;}symbol = subtract;label1.Text = symbol;}else{if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("您已输入运算符");}else{num2 = label1.Text;rt = double.Parse(num1) - double.Parse(num2);num1 = rt.ToString();symbol = subtract;label1.Text = symbol;num2 = null;}}}}private void button16_Click(object sender, EventArgs e){string one = "1";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;}label1.Text = label1.Text + one;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button15_Click(object sender, EventArgs e){string two = "2";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;}label1.Text = label1.Text + two;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button14_Click(object sender, EventArgs e){string three = "3";if (label1.Text.Length < 30){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){label1.Text = null;}label1.Text = label1.Text + three;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button13_Click(object sender, EventArgs e){string add = "+";if (symbol == null && label1.Text.Length < 1 && num1 == null){MessageBox.Show("无运算数字");}else{if (symbol == null){if (num1 == null){num1 = label1.Text;}symbol = add;label1.Text = symbol;}else{if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("您已输入运算符");}else{num2 = label1.Text;rt = double.Parse(num1)+ double.Parse(num2);num1 = rt.ToString();symbol = add;label1.Text = symbol;num2 = null;}}}}private void button20_Click(object sender, EventArgs e){if (label1.Text.Length == 0){MessageBox.Show("error");}else if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{double reserve = double.Parse(label1.Text);reserve = reserve / 100;label1.Text = reserve.ToString();}}private void button19_Click(object sender, EventArgs e){string zero = "0";if(label1.Text.Length < 30){label1.Text = label1.Text + zero;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}private void button18_Click(object sender, EventArgs e){string dot = ".";int f=label1.Text.IndexOf(".");if(f == -1){if(label1.Text.Length == 0){MessageBox.Show("error");}else if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{if (label1.Text.Length < 30){label1.Text = label1.Text + dot;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}}else{MessageBox.Show("error");}}private void button17_Click(object sender, EventArgs e){if (symbol == null && label1.Text.Length < 1){MessageBox.Show("无运算数字");}else{if (symbol == null){num1 = label1.Text;}else{if (label1.Text != null){if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{num2 = label1.Text;}}}}if (num2 != null){if (symbol == "+"){rt = double.Parse(num1) + double.Parse(num2);label1.Text = rt.ToString();num1 = rt.ToString();symbol = null;num2 = null;}else if (symbol == "-"){rt = double.Parse(num1) - double.Parse(num2);label1.Text = rt.ToString();num1 = rt.ToString();symbol = null;num2 = null;}else if (symbol == "×"){rt = double.Parse(num1) * double.Parse(num2);label1.Text = rt.ToString();num1 = rt.ToString();symbol = null;num2 = null;}else if (symbol == "÷"){rt = double.Parse(num1) / double.Parse(num2);label1.Text = rt.ToString();num1 = rt.ToString();symbol = null;num2 = null;}}}}
}