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：

新荣网站建设公司创新互联,新荣网站设计制作，有大型网站制作公司丰富经验。已为新荣上千提供企业网站建设服务。企业网站搭建\成都外贸网站建设公司要多少钱，请找那个售后服务好的新荣做网站的公司定做！

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";
    }
  }
}

另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

网站标题：C#实现的简单整数四则运算计算器功能示例-创新互联
本文URL：http://njwzjz.com/article/dsehsc.html