黑马程序员之WinForm编程基础学习笔记：简单的四则运算器

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using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace Test9

{

public partial calss Form1 : Form

{

public Form1()

{

InitialzeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

//简单的四则运算器

string str1 = txtNumber1.Text;

string str2 = txtNumber2.Text;

int i1= Convert.ToInt32(str1);

int i2 = Convert.ToInt32(str2);

int result;

switch(cb操作符.SelectedIndex)

{

case 0://+

result = i1+ i2;

break;

case 1://-

result = i1- i2;

break;

case 2://*

result = i1* i2;

break;

case 3:// /

if(i2 == 0) //细节决定成败！

{

MessageBox.Show("0不能为除数!");

return;

}

result = i1 / i2;

break;

defualt://防患于未然!

throw new Exception("未知的运算符");

}

txtResult.Text = Convert.ToString(result);

}

}

}

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