用C#设计一个四则运算器
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication21
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnequal_Click(object sender, EventArgs e)
{
string s1 = txt1.Text.Trim();
string s2 = txt2.Text.Trim();
int i1, i2,sum=0;
if (int.TryParse(s1, out i1) == false)
{
MessageBox.Show("第一个输入的不是合法的字符");
txt1.Focus();
txt1.BackColor = Color.Blue;
return;
}
else
{
txt1.BackColor = Color.White;
}
if (int.TryParse(s2, out i2) == false)
{
MessageBox.Show("第二个输入的不是合法的字符");
txt2.Focus();
txt2.BackColor = Color.Red;
}
else
{
txt1.BackColor = Color.White;
}
switch(comboBox1.SelectedIndex)
{
case 0:
sum = i1 + i2;
txt3.Text=sum.ToString();
break;
case 1:
sum = i1 - i2;
break;
case 2:
sum = i1 * i2;
break;
case 3:
sum = i1 / i2;
break;
case -1:
MessageBox.Show("你没有选择运算符");
break;
default:
break;
}
txt3.Text = sum.ToString();
}
}
}
本文转自gauyanm 51CTO博客，原文链接：http://blog.51cto.com/gauyanm/292206，如需转载请自行联系原作者
