本文实例讲述了C#实现简单的计算器功能。分享给大家供大家参考，具体如下：

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Threading;
using System.Diagnostics;
namespace CALCULATOR
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private string _sign;
    private double _first = 10241024;
    private double _second = 10241024;
    private string _number;
    private void button1_Click(object sender, EventArgs e)
    {
      _number += "1";
      this.textBox1.Text += "1";
    }
    private void button2_Click(object sender, EventArgs e)
    {
      _number += "2";
      this.textBox1.Text += "2";
    }
    private void button3_Click(object sender, EventArgs e)
    {
      _number += "3";
      this.textBox1.Text += "3";
    }
    private void button4_Click(object sender, EventArgs e)
    {
      _number += "4";
      this.textBox1.Text += "4";
    }
    private void button8_Click(object sender, EventArgs e)
    {
      _number += "5";
      this.textBox1.Text += "5";
    }
    private void button7_Click(object sender, EventArgs e)
    {
      _number += "6";
      this.textBox1.Text += "6";
    }
    private void button6_Click(object sender, EventArgs e)
    {
      _number += "7";
      this.textBox1.Text += "7";
    }
    private void button5_Click(object sender, EventArgs e)
    {
      _number += "8";
      this.textBox1.Text += "8";
    }
    private void button9_Click(object sender, EventArgs e)
    {
      _number += "9";
      this.textBox1.Text += "9";
    }
    private void button10_Click(object sender, EventArgs e)
    {
      _number += "0";
      this.textBox1.Text += "0";
    }
    private void button16_Click(object sender, EventArgs e)
    {
      //设置加号计算数
      SetNumber(Convert.ToDouble(_number));
      if (_sign == null || _second == 10241024)
      {
        _sign = "+";
        this.textBox1.Text += "+";
        return;
      }
      if (_second != 10241024)
      {
        //开始进行计算
        Computer ComPro = new Computer(_sign, _first, _second);
        this.textBox1.Text = ComPro.Comt(out _first).ToString();
        //验证除数为零的情况
        if (_first == 10241024.10241023)
        {
          this.textBox1.Text = "0";
          MessageBox.Show("除数不能为零！");
          _number = null;
          _first = 10241024;
          _second = 10241024;
          this.textBox1.Text = null;
          _sign = null;
          this.textBox1.Text = null;
        }
        //开始初始化数据
        _sign = "+";
        this.textBox1.Text += "+";
        _second = 10241024;
        _number = null;
        return;
      }
    }
    private void button15_Click(object sender, EventArgs e)
    {
      //设置减号计算数
      SetNumber(Convert.ToDouble(_number));
      if (_sign == null || _second == 10241024)
      {
        _sign = "-";
        this.textBox1.Text += "-";
        return;
      }
      if (_second != 10241024)
      {
        //开始进行计算
        Computer ComPro = new Computer(_sign, _first, _second);
        this.textBox1.Text = ComPro.Comt(out _first).ToString();
        //验证除数为零的情况
        if (_first == 10241024.10241023)
        {
          this.textBox1.Text = "0";
          MessageBox.Show("除数不能为零！");
          _number = null;
          _first = 10241024;
          _second = 10241024;
          this.textBox1.Text = null;
          _sign = null;
          this.textBox1.Text = null;
        }
        //开始初始化数据
        _sign = "-";
        this.textBox1.Text += "-";
        _second = 10241024;
        _number = null;
        return;
      }
    }
    private void button14_Click(object sender, EventArgs e)
    {
      //设置乘号计算数
      SetNumber(Convert.ToDouble(_number));
      if (_sign == null || _second == 10241024)
      {
        _sign = "*";
        this.textBox1.Text += "*";
        return;
      }
      if (_second != 10241024)
      {
        //开始进行计算
        Computer ComPro = new Computer(_sign, _first, _second);
        this.textBox1.Text = ComPro.Comt(out _first).ToString();
        //验证除数为零的情况
        if (_first == 10241024.10241023)
        {
          this.textBox1.Text = "0";
          MessageBox.Show("除数不能为零！");
          _number = null;
          _first = 10241024;
          _second = 10241024;
          this.textBox1.Text = null;
          _sign = null;
          this.textBox1.Text = null;
        }
        //开始初始化数据
        _sign = "*";
        this.textBox1.Text += "*";
        _second = 10241024;
        _number = null;
        return;
      }
    }
      /// 

      /// 设置除号计算数
      /// 
      /// 
      /// 
    private void button11_Click(object sender, EventArgs e)
    {
      SetNumber(Convert.ToDouble(_number));
      if (_sign == null || _second == 10241024)
      {
        _sign = "/";
        this.textBox1.Text += "/";
        return;
      }
      if (_second != 10241024)
      {
        //开始进行计算
        Computer ComPro = new Computer(_sign, _first, _second);
        this.textBox1.Text = ComPro.Comt(out _first).ToString();
        //验证除数为零的情况
        if (_first == 10241024.10241023)
        {
          this.textBox1.Text = "0";
          this.textBox1.Text = "除数不能为零！";
          _number = null;
          _first = 10241024;
          _second = 10241024;
          this.textBox1.Text = null;
          _sign = null;
          this.textBox1.Text = null;
        }
        //开始初始化数据
        _sign = "/";
        this.textBox1.Text += "/";
        _second = 10241024;
        _number = null;
        return;
      }
    }
    /// 

    /// 清空输入框
    /// 
    /// 
    /// 
    private void button12_Click(object sender, EventArgs e)
    {
      _number = null;
      _first = 10241024;
      _second = 10241024;
      this.textBox1.Text = null;
      _sign = null;
      this.textBox1.Text = null;
    }
    private void button13_Click(object sender, EventArgs e)
    {
      SetNumber(Convert.ToDouble(_number));
      //判断是否设置了_second的值
      if (_second == 10241024)
      {
        _second = Convert.ToDouble(_number);
        _number = null;
      }
      //判断是否设置了_first的值
      if (_first == 10241024)
      {
        _first = Convert.ToDouble(_number);
        _number = null;
      }
      //判断是否有_sign的值
      if (_sign == null)
      {
        _sign = "+";
      }
      //开始进行计算
      Computer ComPro = new Computer(_sign, _first, _second);
      this.textBox1.Text = ComPro.Comt(out _first).ToString();
      //验证除数为零的情况
      if (_first == 10241024.10241023)
      {
        this.textBox1.Text = "0";
        MessageBox.Show("除数不能为零！");
        _number = null;
        _first = 10241024;
        _second = 10241024;
        this.textBox1.Text = null;
        _sign = null;
        this.textBox1.Text = null;
      }
      //开始初始化数据
      _sign = null;
      _second = 10241024;
      _number = null;
    }
    public class Computer
    {
      private string _sign;
      private double _first;
      private double _second;
      public Computer(string str, double first, double second)
      {
        _sign = str;
        _first = first;
        _second = second;
      }
      //选择相应的运算符进行运算
      public double Comt(out double first)
      {
        if (_sign == "+")
        {
          first = _first + _second;
          return _first + _second;
        }
        else if (_sign == "-")
        {
          first = _first - _second;
          return _first - _second;
        }
        else if (_sign == "*")
        {
          first = _first * _second;
          return _first * _second;
        }
        else if (_sign == "/")
        {
          if (_second == 0)
          {
            first = 10241024.10241023;
            return 10241024.10241023;
          }
          else
          {
            first = _first / _second;
            return _first / _second;
          }
        }
        else
        {
          first = 10241024.10241024;
          return 10241024.10241024;
        }
      }
    }
    //设置数字函数
    public void SetNumber(double number)
    {
      if (_first == 10241024 && _number != null)
      {
        _first = Convert.ToDouble(_number);
        _number = null;
      }
      else if (_second == 10241024 && _number != null)
      {
        _second = Convert.ToDouble(_number);
        _number = null;
      }
    }
    private void timer1_Tick(object sender, EventArgs e)
    {
      this.label2.Text = DateTime.Now.ToString();
    }
    private void button24_Click(object sender, EventArgs e)
    {
      if (this.textBox1.Text == " ")
      {
        MessageBox.Show("请输入数据");
        this.textBox1.Text = Convert.ToInt64(textBox1.Text.ToString(), 2).ToString();
      }
      else
      {
        this.textBox1.Text = Convert.ToInt64(textBox1.Text.ToString(), 2).ToString();
      }
    }
    private void button22_Click(object sender, EventArgs e)
    {
      if (this.textBox1.Text == " ")
      {
        MessageBox.Show("请输入数据");
        Int64 int64 = Convert.ToInt64(textBox1.Text.ToString(), 2);
        this.textBox1.Text = Convert.ToString(int64,16);
      }
      else
      {
        Int64 int64 = Convert.ToInt64(textBox1.Text.ToString(), 2);
        this.textBox1.Text = Convert.ToString(int64, 16);
      }
    }
    private void button23_Click(object sender, EventArgs e)
    {
      if (this.textBox1.Text == " ")
      {
        MessageBox.Show("请输入数据");
        Int64 int64 = Convert.ToInt64(textBox1.Text.ToString(), 2);
        this.textBox1.Text = Convert.ToString(int64, 8);
      }
      else
      {
        Int64 int64 = Convert.ToInt64(textBox1.Text.ToString(), 2);
        this.textBox1.Text = Convert.ToString(int64, 8);
      }
    }
    private void button21_Click(object sender, EventArgs e)
    {
      if (this.textBox1.Text == " ")
      {
        MessageBox.Show("请输入数据");
        Int64 int64 = Convert.ToInt64(textBox1.Text);
        this.textBox1.Text = Convert.ToString(int64, 2);
      }
      else
      {
        Int64 int64 = Convert.ToInt64(textBox1.Text);
        this.textBox1.Text = Convert.ToString(int64, 2);
      }
    }
    private void button27_Click(object sender, EventArgs e)
    {
      double buffer1= Convert.ToDouble(textBox1.Text);
        buffer1 = 1 / buffer1;
      this.textBox1.Text = buffer1.ToString();
    }
    private void button17_Click(object sender, EventArgs e)
    {
      _number += ".";
      this.textBox1.Text += ".";
    }
    private void button25_Click(object sender, EventArgs e)
    {
      double buffer1 = Convert.ToDouble(textBox1.Text);
      buffer1 = buffer1 * buffer1;
      this.textBox1.Text = buffer1.ToString();
    }
    private void button26_Click(object sender, EventArgs e)
    {
      if (this.textBox1.Text == " ")
      {
        MessageBox.Show("请输入数据");
        Int64 int64 = Convert.ToInt64(this.textBox1.Text);
        Int64 temp1 = 1;
        while (int64 > 1)
        {
          temp1 = temp1*int64 ;
          int64--;
        }
        this.textBox1.Text = temp1.ToString();
      }
      else
      {
        Int64 int64 = Convert.ToInt64(this.textBox1.Text);
        Int64 temp1 = 1;
        while (int64 > 1)
        {
          temp1 = temp1 * int64;
          int64--;
        }
        this.textBox1.Text = temp1.ToString();
      }
    }
    private void button28_Click(object sender, EventArgs e)
    {
      //Int64 int64 = Convert.ToInt64(this.textBox1.Text);
      //double temp=Math.Log10(int64);
      //this.textBox1.Text = temp.ToString();
      Double temp1, temp2;
      string[] STRarry = new string[2];
      STRarry = this.textBox1.Text.Split('.');
      temp1 = Convert.ToDouble(STRarry[0]);
      temp2 = Convert.ToDouble(STRarry[1]);
      // double temp1 = Convert.ToDouble(this.textBox1.Text);
      temp2 = Math.Log(temp2,temp1 );
      this.textBox1.Text = temp2.ToString();
    }
    private void button18_Click(object sender, EventArgs e)
    {
      double temp1 = Convert.ToDouble(this.textBox1.Text);
      double temp2 = Math.Sin(temp1);
      this.textBox1.Text = temp2.ToString();
    }
    private void button19_Click(object sender, EventArgs e)
    {
      double temp1 = Convert.ToDouble(this.textBox1.Text);
      double temp2 = Math.Cos(temp1);
      this.textBox1.Text = temp2.ToString();
    }
    private void button20_Click(object sender, EventArgs e)
    {
      double temp1 = Convert.ToDouble(this.textBox1.Text);
      double temp2 = Math.Tan(temp1);
      this.textBox1.Text = temp2.ToString();
    }
    private void button33_Click(object sender, EventArgs e)
    {
      Double temp1, temp2;
      string[] STRarry=new string[2];
      STRarry=this.textBox1.Text.Split('.');
      temp1 = Convert.ToDouble(STRarry[0]);
      temp2 = Convert.ToDouble(STRarry[1]);
      // double temp1 = Convert.ToDouble(this.textBox1.Text);
      temp2 = Math.Pow(temp1,temp2);
      this.textBox1.Text = temp2.ToString();
    }
    /// 

    /// 计算e的temp1次幂
    /// 
    /// 
    /// 
    private void button31_Click(object sender, EventArgs e)
    {
      double temp1 = Convert.ToDouble(this.textBox1.Text);
      double temp2 = Math.Exp(temp1);
      this.textBox1.Text = temp2.ToString();
    }
    private void button34_Click(object sender, EventArgs e)
    {
       double temp1 = Convert.ToDouble(this.textBox1.Text);
      double temp2 = Math.Sqrt(temp1);
      this.textBox1.Text = temp2.ToString();
    }
    private void button32_Click(object sender, EventArgs e)
    {
      Double temp1, temp2;
      string[] STRarry = new string[2];
      STRarry = this.textBox1.Text.Split('.');
      temp1 = Convert.ToDouble(STRarry[0]);
      temp2 = Convert.ToDouble(STRarry[1]);
      // double temp1 = Convert.ToDouble(this.textBox1.Text);
      temp2 = Math.IEEERemainder(temp1, temp2);
      this.textBox1.Text = temp2.ToString();
    }
    /// 

    /// 圆的面积
    /// 
    /// 
    /// 
    private void button30_Click(object sender, EventArgs e)
    {
      double buffer1 = Convert.ToDouble(textBox1.Text);
      buffer1 =3.1415926*buffer1*buffer1;
      this.textBox1.Text = buffer1.ToString();
    }
    /// 

    /// 三角形面积
    /// 
    /// 
    /// 
    private void button29_Click(object sender, EventArgs e)
    {
      Double temp1, temp2,temp3,p,area;
      string[] STRarry = new string[3];
      STRarry = this.textBox1.Text.Split('.');
      temp1 = Convert.ToDouble(STRarry[0]);
      temp2 = Convert.ToDouble(STRarry[1]);
      temp3 = Convert.ToDouble(STRarry[2]);
      // double temp1 = Convert.ToDouble(this.textBox1.Text);
      p = (temp1 + temp2 + temp3) / 2;
      area= p * (p - temp1) * (p - temp2) * (p - temp3);
      area = Math.Sqrt(area);
      this.textBox1.Text = area.ToString();
    }
    private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
    {
      string str = e.Link.ToString();
      Process.Start(str);
    }
    private void Form1_Load(object sender, EventArgs e)
    {
    }
  }
}

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分享名称：C#实现简单的计算器功能完整实例-创新互联
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