本文实例讲述了c#实现的简单整数四则运算计算器功能。分享给大家供大家参考，具体如下：
运行效果图如下：
具体代码如下：
using system;
using system.collections.generic;
using system测试数据ponentmodel;
using system.data;
using system.drawing;
using system.text;
using system.windows.forms;
namespace 计算器
{
public partial class form1 : form
{
public form1()
{
initializecomponent();
}
public string num;
public int flag; //用于判断输入的操作符
public double num1, num2;
private void num0_button_click( object sender, eventargs e)
{
num = num + "0" ;
num2 = convert.todouble(num);
textbox.text = num;
}
private void num1_button_click( object sender, eventargs e) //重点算法1
{
if (textbox.text == "0" )
{
num = "1" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "1" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void num2_button_click( object sender, eventargs e)
{
if (textbox.text == "0" )
{
num = "2" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "2" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void num3_button_click( object sender, eventargs e)
{
if (textbox.text == "0" )
{
num = "3" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "3" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void num4_button_click( object sender, eventargs e)
{
if (textbox.text == "0" )
{
num = "4" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "4" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void num5_button_click( object sender, eventargs e)
{
if (textbox.text == "0" )
{
num = "5" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "5" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void num6_button_click( object sender, eventargs e)
{
if (textbox.text == "0" )
{
num = "6" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "6" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void num7_button_click( object sender, eventargs e)
{
if (textbox.text == "0" )
{
num = "7" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "7" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void num8_button_click( object sender, eventargs e)
{
if (textbox.text == "0" )
{
num = "8" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "8" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void num9_button_click( object sender, eventargs e)
{
if (textbox.text == "0" )
{
num = "9" ;
textbox.text = convert.tostring(num);
}
else
{
num = num + "9" ;
num2 = convert.todouble(num);
textbox.text = num;
}
}
private void add_button_click( object sender, eventargs e) //重点算法2
{
if (textbox.text.length > 0)
{
num1 = convert.todouble(textbox .text);
num = "" ;
flag = 1;
textbox.text = "" ;
textbox.focus();
}
}
private void dev_button_click( object sender, eventargs e)
{
if (textbox.text.length > 0)
{
num1 = convert.todouble(textbox.text);
num = "" ;
flag = 2;
textbox.text = "" ;
textbox.focus();
}
}
private void mul_button_click( object sender, eventargs e)
{
if (textbox.text.length > 0)
{
num1 = convert.todouble(textbox.text);
num = "" ;
flag = 3;
textbox.text = "" ;
textbox.focus();
}
}
private void chu_button_click( object sender, eventargs e)
{
if (textbox.text.length > 0)
{
num1 = convert.todouble(textbox.text);
num = "" ;
flag = 4;
// textbox.text = "";
textbox.focus();
}
}
private void equ_button_click( object sender, eventargs e)
{
switch (flag)
{
case 1:
textbox.text = convert.tostring(num1+convert .todouble(num)); //重点算法3
num2 = convert.todouble(textbox .text);
break ;
case 2:
textbox.text = convert.tostring(num1 - convert.todouble(num));
num2 = convert.todouble(textbox.text);
break ;
case 3:
textbox.text = convert.tostring(num1 * convert.todouble(num));
num2 = convert.todouble(textbox.text);
break ;
case 4:
textbox.text = convert.tostring(num1 / convert.todouble(num));
num2 = convert.todouble(textbox.text);
break ;
}
}
private void re_button_click( object sender, eventargs e)
{
num = "" ;
textbox.text = "0" ;
}
}
}
希望本文所述对大家c#程序设计有所帮助。
原文链接：http://blog.csdn.net/lovequanxin/article/details/5527694
dy("nrwz");
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