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利用WPF窗口程序设计简单计算器

这篇文章主要为大家详细介绍了利用WPF窗口程序设计简单计算器,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

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)。

 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。

 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)

 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

 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

 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 )

 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

 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" >      

.cs文件

 namespace 小小计算器 { ///  /// MainWindow.xaml 的交互逻辑 ///  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。

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