C#实现的简单整数四则运算计算器功能示例

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.componentmodel;
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