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。
京公网安备 11010802041100号 | 京ICP备19059560号-4 | PHP1.CN 第一PHP社区 版权所有