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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