C#實現(xiàn)的簡單整數(shù)四則運算計算器功能示例

更新時間：2017年09月29日 11:29:26 作者：lovequanxin

這篇文章主要介紹了C#實現(xiàn)的簡單整數(shù)四則運算計算器功能,涉及C#界面布局、事件響應及數(shù)值運算等相關操作技巧,需要的朋友可以參考下

本文實例講述了C#實現(xiàn)的簡單整數(shù)四則運算計算器功能。分享給大家供大家參考，具體如下：

運行效果圖如下：

具體代碼如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace 計算器
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    public　string　num;
    public int flag;//用于判斷輸入的操作符
    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)//重點算法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)//重點算法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));//重點算法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";
    }
  }
}

PS：這里再為大家推薦幾款計算工具供大家進一步參考借鑒：

在線一元函數(shù)（方程）求解計算工具：
http://tools.jb51.net/jisuanqi/equ_jisuanqi

科學計算器在線使用_高級計算器在線計算：
http://tools.jb51.net/jisuanqi/jsqkexue

在線計算器_標準計算器：
http://tools.jb51.net/jisuanqi/jsq

更多關于C#相關內(nèi)容感興趣的讀者可查看本站專題：《C#數(shù)據(jù)結構與算法教程》、《C#程序設計之線程使用技巧總結》、《C#常見控件用法教程》、《WinForm控件用法總結》、《C#數(shù)組操作技巧總結》及《C#面向對象程序設計入門教程》

希望本文所述對大家C#程序設計有所幫助。

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