本文中设计的计算器仅支持单次双目运算,可连续计算。
实验要求:
1、在wpf项目中编程实现一个简单计算器,具体要求如下:
1)实现+,-,*,/运算
2)可以连续进行计算。
效果如图:
*该程序中数字通过点击对应按钮输入,运算符包含四种常用运算,除此之外还有退格以及清空操作,输入以及运算结果在上方文本框内显示
1.首先,该程序中只涉及单次运算,所以我们可以在隐藏文件里声明两个全局变量来相应的保存operation前后两个数(字符串)。
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string num1 = null ; //运算符之前的数 string num2 = null ; //运算符之后的数 string ope = null ; //运算符 |
2.每次键入一个位数要判断放在num1里还是num2里。
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private void button1_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button1.Content; textBox.Text = num1; } else { num2 += button1.Content; textBox.Text = num2; } } |
3.键入运算符是对变量ope赋值(因为是单次计算,所以运算符没必要在文本框里显示)
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private void buttonADD_Click( object sender, RoutedEventArgs e) { ope = "+" ; } |
4.CE清空操作,将textbox中的内容以及所有变量清空
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private void buttonCE_Click( object sender, RoutedEventArgs e) { //if (ope == null) //{ // num1 = textBox.Text; //} //else //{ // num2 = textBox.Text; //} this .textBox.Text = "" ; num1 = null ; num2 = null ; ope = null ; } |
5.退格操作
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private void buttonBK_Click( object sender, RoutedEventArgs e) { string s = textBox.Text; int len = s.Length; if (textBox.Text != null && len >= 1) textBox.Text = s.Remove(len - 1); if (ope == null ) { num1 = textBox.Text; } else { num2 = textBox.Text; } } |
6.计算结果(利用switch case )
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private void buttonEQ_Click( object sender, RoutedEventArgs e) { switch (ope) { case "+" : textBox.Text = Convert.ToString(Convert.ToDouble(num1) + Convert.ToDouble(num2)); break ; case "-" : textBox.Text = Convert.ToString(Convert.ToDouble(num1) - Convert.ToDouble(num2)); break ; case "*" : textBox.Text = Convert.ToString(Convert.ToDouble(num1) * Convert.ToDouble(num2)); break ; case "/" : textBox.Text = Convert.ToString(Convert.ToDouble(num1) / Convert.ToDouble(num2)); break ; } num1 = textBox.Text; num2 = null ; ope = null ; } |
将结果值赋给num1来实现连续计算.
效果如如下:
完整代码如下:
*xaml
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Window x:Class="小小计算器.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="计算器" Height="382" Width="362"> < Grid Height = "335" > < Grid.ColumnDefinitions > < ColumnDefinition Width = "48*" /> < ColumnDefinition Width = "23*" /> </ Grid.ColumnDefinitions > < Button Content = "CE" Height = "30" HorizontalAlignment = "Left" Margin = "62,87,0,0" Name = "buttonCE" VerticalAlignment = "Top" Width = "41" Click = "buttonCE_Click" /> < Button Content = "<-" Height = "29" HorizontalAlignment = "Left" Margin = "118,87,0,0" Name = "buttonBK" VerticalAlignment = "Top" Width = "45" Click = "buttonBK_Click" /> < Button Content = "." Height = "29" HorizontalAlignment = "Left" Margin = "185,87,0,0" Name = "buttonDOT" VerticalAlignment = "Top" Width = "46" Click = "buttonDOT_Click" /> < Button Content = "+" Height = "28" HorizontalAlignment = "Left" Margin = "7,87,0,0" Name = "buttonADD" VerticalAlignment = "Top" Width = "47" Click = "buttonADD_Click" Grid.Column = "1" /> < Button Content = "1" Height = "30" HorizontalAlignment = "Left" Margin = "62,136,0,0" Name = "button1" VerticalAlignment = "Top" Width = "41" Click = "button1_Click" /> < Button Content = "2" Height = "30" HorizontalAlignment = "Left" Margin = "118,136,0,0" Name = "button2" VerticalAlignment = "Top" Width = "45" Click = "button2_Click" /> < Button Content = "3" Height = "30" HorizontalAlignment = "Left" Margin = "185,136,0,0" Name = "button3" VerticalAlignment = "Top" Width = "46" Click = "button3_Click" RenderTransformOrigin = "1.217,0.437" /> < Button Content = "-" Height = "30" HorizontalAlignment = "Left" Margin = "7,136,0,0" Name = "buttonSUB" VerticalAlignment = "Top" Width = "47" Click = "buttonSUB_Click" Grid.Column = "1" /> < Button Content = "4" Height = "30" HorizontalAlignment = "Left" Margin = "62,186,0,0" Name = "button4" VerticalAlignment = "Top" Width = "41" Click = "button4_Click" /> < Button Content = "5" Height = "30" HorizontalAlignment = "Left" Margin = "118,186,0,0" Name = "button5" VerticalAlignment = "Top" Width = "45" Click = "button5_Click" /> < Button Content = "6" Height = "30" HorizontalAlignment = "Left" Margin = "185,186,0,0" Name = "button6" VerticalAlignment = "Top" Width = "46" Click = "button6_Click" /> < Button Content = "*" Height = "30" HorizontalAlignment = "Left" Margin = "7,186,0,0" Name = "buttonMUP" VerticalAlignment = "Top" Width = "47" Click = "buttonMUP_Click" Grid.Column = "1" /> < Button Content = "7" Height = "30" HorizontalAlignment = "Left" Margin = "62,231,0,0" Name = "button7" VerticalAlignment = "Top" Width = "40" Click = "button7_Click" /> < Button Content = "8" Height = "30" HorizontalAlignment = "Left" Margin = "118,231,0,0" Name = "button8" VerticalAlignment = "Top" Width = "45" Click = "button8_Click" /> < Button Content = "9" Height = "30" HorizontalAlignment = "Left" Margin = "185,231,0,0" Name = "button9" VerticalAlignment = "Top" Width = "46" Click = "button9_Click" /> < Button Content = "/" Height = "30" HorizontalAlignment = "Left" Margin = "7,231,0,0" Name = "buttonDIV" VerticalAlignment = "Top" Width = "47" Click = "buttonDIV_Click" Grid.Column = "1" /> < Button Content = "0" Height = "25" HorizontalAlignment = "Left" Margin = "62,281,0,0" Name = "button0" VerticalAlignment = "Top" Width = "101" Click = "button0_Click" /> < Button Content = "=" Height = "25" HorizontalAlignment = "Right" Margin = "0,281,59.2,0" Name = "buttonEQ" VerticalAlignment = "Top" Width = "111" Grid.ColumnSpan = "2" Click = "buttonEQ_Click" RenderTransformOrigin = "-0.085,0.493" /> < TextBox Grid.ColumnSpan = "2" Height = "32" HorizontalAlignment = "Left" Margin = "88,30,0,0" Name = "textBox" VerticalAlignment = "Top" Width = "173" /> </ Grid > </ Window > |
.cs文件
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namespace 小小计算器 { /// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> public partial class MainWindow : Window { string num1 = null ; //运算符之前的数 string num2 = null ; //运算符之后的数 string ope = null ; //运算符 public MainWindow() { InitializeComponent(); } private void button1_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button1.Content; textBox.Text = num1; } else { num2 += button1.Content; textBox.Text = num2; } } private void button2_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button2.Content; textBox.Text = num1; } else { num2 += button2.Content; textBox.Text = num2; } } private void button3_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button3.Content; textBox.Text = num1; } else { num2 += button3.Content; textBox.Text = num2; } } private void button4_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button4.Content; textBox.Text = num1; } else { num2 += button4.Content; textBox.Text = num2; } } private void button5_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button5.Content; textBox.Text = num1; } else { num2 += button5.Content; textBox.Text = num2; } } private void button6_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button6.Content; textBox.Text = num1; } else { num2 += button6.Content; textBox.Text = num2; } } private void button7_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button7.Content; textBox.Text = num1; } else { num2 += button7.Content; textBox.Text = num2; } } private void button8_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button8.Content; textBox.Text = num1; } else { num2 += button8.Content; textBox.Text = num2; } } private void button9_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button9.Content; textBox.Text = num1; } else { num2 += button9.Content; textBox.Text = num2; } } private void button0_Click( object sender, RoutedEventArgs e) { if (ope == null ) { num1 += button0.Content; textBox.Text = num1; } else { num2 += button0.Content; textBox.Text = num2; } } private void buttonADD_Click( object sender, RoutedEventArgs e) { ope = "+" ; } private void buttonSUB_Click( object sender, RoutedEventArgs e) { ope = "-" ; } private void buttonMUP_Click( object sender, RoutedEventArgs e) { ope = "*" ; } private void buttonDIV_Click( object sender, RoutedEventArgs e) { ope = "/" ; } private void buttonDOT_Click( object sender, RoutedEventArgs e) { if (ope == null &&!num1.Contains( "." )) //如果num中已有小数点,则不允许再输入. { num1 += buttonDOT.Content; textBox.Text = num1; } if (ope!= null &&!num2.Contains( "." )) { num2 += buttonDOT.Content; textBox.Text = num2; } } private void buttonCE_Click( object sender, RoutedEventArgs e) { //if (ope == null) //{ // num1 = textBox.Text; //} //else //{ // num2 = textBox.Text; //} this .textBox.Text = "" ; num1 = null ; num2 = null ; ope = null ; } private void buttonBK_Click( object sender, RoutedEventArgs e) { string s = textBox.Text; int len = s.Length; if (textBox.Text != null && len >= 1) textBox.Text = s.Remove(len - 1); if (ope == null ) { num1 = textBox.Text; } else { num2 = textBox.Text; } } private void buttonEQ_Click( object sender, RoutedEventArgs e) { switch (ope) { case "+" : textBox.Text = Convert.ToString(Convert.ToDouble(num1) + Convert.ToDouble(num2)); break ; case "-" : textBox.Text = Convert.ToString(Convert.ToDouble(num1) - Convert.ToDouble(num2)); break ; case "*" : textBox.Text = Convert.ToString(Convert.ToDouble(num1) * Convert.ToDouble(num2)); break ; case "/" : textBox.Text = Convert.ToString(Convert.ToDouble(num1) / Convert.ToDouble(num2)); break ; } num1 = textBox.Text; num2 = null ; ope = null ; } } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/ninini12386/article/details/109540691