用C#语言编一个能进行两个数加减乘除的计算器

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace A0
{
///

/// Form1 的摘要说明。
///

public class Form1 : System.Windows.Forms.Form
{
private double a=0;
private double b=0;
private string stroper="=";
bool blclear=true,blopen=true;

private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.Button button4;
private System.Windows.Forms.Button button5;
private System.Windows.Forms.Button button6;
private System.Windows.Forms.Button button7;
private System.Windows.Forms.Button button8;
private System.Windows.Forms.Button button9;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button10;
private System.Windows.Forms.Button button11;
private System.Windows.Forms.Button button12;
private System.Windows.Forms.Button button13;
private System.Windows.Forms.Button button14;
private System.Windows.Forms.Button button15;
private System.Windows.Forms.Button button16;
private System.Windows.Forms.Button button17;
private System.Windows.Forms.Button button19;
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.PictureBox pictureBox1;
///

/// 必需的设计器变量。
///

private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

///

/// 清理所有正在使用的资源。
///

protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
///

/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///

private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.button4 = new System.Windows.Forms.Button();
this.button5 = new System.Windows.Forms.Button();
this.button6 = new System.Windows.Forms.Button();
this.button7 = new System.Windows.Forms.Button();
this.button8 = new System.Windows.Forms.Button();
this.button9 = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.button10 = new System.Windows.Forms.Button();
this.button11 = new System.Windows.Forms.Button();
this.button12 = new System.Windows.Forms.Button();
this.button13 = new System.Windows.Forms.Button();
this.button14 = new System.Windows.Forms.Button();
this.button15 = new System.Windows.Forms.Button();
this.button16 = new System.Windows.Forms.Button();
this.button17 = new System.Windows.Forms.Button();
this.button19 = new System.Windows.Forms.Button();
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.pictureBox1 = new System.Windows.Forms.PictureBox();
this.groupBox1.SuspendLayout();
this.SuspendLayout();
//
// button1
//
this.button1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button1.Location = new System.Drawing.Point(40, 144);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(31, 31);
this.button1.TabIndex = 0;
this.button1.Text = "1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button2.Location = new System.Drawing.Point(80, 144);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(31, 31);
this.button2.TabIndex = 1;
this.button2.Text = "2";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// button3
//
this.button3.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button3.Location = new System.Drawing.Point(120, 144);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(31, 31);
this.button3.TabIndex = 2;
this.button3.Text = "3";
this.button3.Click += new System.EventHandler(this.button3_Click);
//
// button4
//
this.button4.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button4.Location = new System.Drawing.Point(40, 104);
this.button4.Name = "button4";
this.button4.Size = new System.Drawing.Size(31, 31);
this.button4.TabIndex = 3;
this.button4.Text = "4";
this.button4.Click += new System.EventHandler(this.button4_Click);
//
// button5
//
this.button5.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button5.Location = new System.Drawing.Point(80, 104);
this.button5.Name = "button5";
this.button5.Size = new System.Drawing.Size(31, 31);
this.button5.TabIndex = 4;
this.button5.Text = "5";
this.button5.Click += new System.EventHandler(this.button5_Click);
//
// button6
//
this.button6.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button6.Location = new System.Drawing.Point(120, 104);
this.button6.Name = "button6";
this.button6.Size = new System.Drawing.Size(31, 31);
this.button6.TabIndex = 5;
this.button6.Text = "6";
this.button6.Click += new System.EventHandler(this.button6_Click);
//
// button7
//
this.button7.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button7.Location = new System.Drawing.Point(40, 64);
this.button7.Name = "button7";
this.button7.Size = new System.Drawing.Size(31, 31);
this.button7.TabIndex = 6;
this.button7.Text = "7";
this.button7.Click += new System.EventHandler(this.button7_Click);
//
// button8
//
this.button8.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button8.Location = new System.Drawing.Point(80, 64);
this.button8.Name = "button8";
this.button8.Size = new System.Drawing.Size(31, 31);
this.button8.TabIndex = 7;
this.button8.Text = "8";
this.button8.Click += new System.EventHandler(this.button8_Click);
//
// button9
//
this.button9.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button9.Location = new System.Drawing.Point(120, 64);
this.button9.Name = "button9";
this.button9.Size = new System.Drawing.Size(31, 31);
this.button9.TabIndex = 8;
this.button9.Text = "9";
this.button9.Click += new System.EventHandler(this.button9_Click);
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(16, 16);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(200, 21);
this.textBox1.TabIndex = 9;
this.textBox1.Text = "";
this.textBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
//
// button10
//
this.button10.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button10.Location = new System.Drawing.Point(40, 184);
this.button10.Name = "button10";
this.button10.Size = new System.Drawing.Size(31, 31);
this.button10.TabIndex = 10;
this.button10.Text = "0";
this.button10.Click += new System.EventHandler(this.button10_Click);
//
// button11
//
this.button11.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button11.ForeColor = System.Drawing.SystemColors.HotTrack;
this.button11.Location = new System.Drawing.Point(80, 184);
this.button11.Name = "button11";
this.button11.Size = new System.Drawing.Size(31, 31);
this.button11.TabIndex = 11;
this.button11.Text = ".";
this.button11.Click += new System.EventHandler(this.button11_Click);
//
// button12
//
this.button12.ForeColor = System.Drawing.Color.Red;
this.button12.Location = new System.Drawing.Point(144, 136);
this.button12.Name = "button12";
this.button12.Size = new System.Drawing.Size(31, 31);
this.button12.TabIndex = 12;
this.button12.Text = "+";
this.button12.Click += new System.EventHandler(this.button12_Click);
//
// button13
//
this.button13.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button13.ForeColor = System.Drawing.Color.Red;
this.button13.Location = new System.Drawing.Point(160, 144);
this.button13.Name = "button13";
this.button13.Size = new System.Drawing.Size(31, 31);
this.button13.TabIndex = 13;
this.button13.Text = "-";
this.button13.Click += new System.EventHandler(this.button13_Click);
//
// button14
//
this.button14.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button14.ForeColor = System.Drawing.Color.Red;
this.button14.Location = new System.Drawing.Point(160, 104);
this.button14.Name = "button14";
this.button14.Size = new System.Drawing.Size(31, 31);
this.button14.TabIndex = 14;
this.button14.Text = "*";
this.button14.Click += new System.EventHandler(this.button14_Click);
//
// button15
//
this.button15.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button15.ForeColor = System.Drawing.Color.Red;
this.button15.Location = new System.Drawing.Point(160, 64);
this.button15.Name = "button15";
this.button15.Size = new System.Drawing.Size(31, 31);
this.button15.TabIndex = 15;
this.button15.Text = "/";
this.button15.Click += new System.EventHandler(this.button15_Click);
//
// button16
//
this.button16.ForeColor = System.Drawing.Color.FromArgb(((System.Byte)(0)), ((System.Byte)(192)), ((System.Byte)(0)));
this.button16.Location = new System.Drawing.Point(144, 176);
this.button16.Name = "button16";
this.button16.Size = new System.Drawing.Size(31, 31);
this.button16.TabIndex = 16;
this.button16.Text = "=";
this.button16.Click += new System.EventHandler(this.button16_Click);
//
// button17
//
this.button17.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button17.ForeColor = System.Drawing.Color.Magenta;
this.button17.Location = new System.Drawing.Point(40, 224);
this.button17.Name = "button17";
this.button17.Size = new System.Drawing.Size(112, 31);
this.button17.TabIndex = 17;
this.button17.Text = "Backspace";
this.button17.Click += new System.EventHandler(this.button17_Click);
//
// button19
//
this.button19.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button19.ForeColor = System.Drawing.Color.Magenta;
this.button19.Location = new System.Drawing.Point(104, 136);
this.button19.Name = "button19";
this.button19.Size = new System.Drawing.Size(31, 31);
this.button19.TabIndex = 19;
this.button19.Text = "C";
this.button19.Click += new System.EventHandler(this.button19_Click);
//
// groupBox1
//
this.groupBox1.Controls.Add(this.button12);
this.groupBox1.Controls.Add(this.button19);
this.groupBox1.Controls.Add(this.button16);
this.groupBox1.Location = new System.Drawing.Point(16, 48);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(200, 216);
this.groupBox1.TabIndex = 20;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "计算机区";
//
// pictureBox1
//
this.pictureBox1.Location = new System.Drawing.Point(0, -64);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(376, 376);
this.pictureBox1.TabIndex = 21;
this.pictureBox1.TabStop = false;
this.pictureBox1.Click += new System.EventHandler(this.pictureBox1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(232, 309);
this.Controls.Add(this.button17);
this.Controls.Add(this.button15);
this.Controls.Add(this.button14);
this.Controls.Add(this.button13);
this.Controls.Add(this.button11);
this.Controls.Add(this.button10);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.button9);
this.Controls.Add(this.button8);
this.Controls.Add(this.button7);
this.Controls.Add(this.button6);
this.Controls.Add(this.button5);
this.Controls.Add(this.button4);
this.Controls.Add(this.button3);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.groupBox1);
this.Controls.Add(this.pictureBox1);
this.Name = "Form1";
this.Text = "计算器";
this.Load += new System.EventHandler(this.Form1_Load);
this.groupBox1.ResumeLayout(false);
this.ResumeLayout(false);

}
#endregion

///

/// 应用程序的主入口点。
///

[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void clear()
{
a=0;
b=0;
blopen=true;
textBox1.Text="";
textBox1.Focus();//设置焦点
}
private void opter()
{
if(blopen)
a=b;
else
calc();
blopen=false;
blclear=true;
}
private void number(string num)
{
if(blclear) textBox1.Text ="";
textBox1.Text +=num;
b=double.Parse (textBox1.Text );
blclear=false;
}
private void calc()
{
switch(stroper)
{
case "+":
a+=b;
break;
case "-":
a-=b;
break;
case "*":
a*=b;
break;
case "/":
a/=b;
break;
}

blopen=true;
textBox1.Text=Convert.ToString(a);
b=a;
}

private void Form1_Load(object sender, System.EventArgs e)
{

}

private void textBox1_TextChanged(object sender, System.EventArgs e)
{

}

private void button16_Click(object sender, System.EventArgs e)
{
calc();
}

private void pictureBox1_Click(object sender, System.EventArgs e)
{

}

private void button15_Click(object sender, System.EventArgs e)
{
stroper="/";
opter();

}

private void button14_Click(object sender, System.EventArgs e)
{
stroper="*";
opter();

}

private void button7_Click(object sender, System.EventArgs e)
{
number("7");
}

private void button13_Click(object sender, System.EventArgs e)
{
stroper="-";
opter();
}

private void button12_Click(object sender, System.EventArgs e)
{
stroper="+";
opter();
}

private void button8_Click(object sender, System.EventArgs e)
{
number("8");
}

private void button9_Click(object sender, System.EventArgs e)
{
number("9");
}

private void button4_Click(object sender, System.EventArgs e)
{
number("4");
}

private void button5_Click(object sender, System.EventArgs e)
{
number("5");
}

private void button6_Click(object sender, System.EventArgs e)
{
number("6");
}

private void button1_Click(object sender, System.EventArgs e)
{
number("1");
}

private void button2_Click(object sender, System.EventArgs e)
{
number("2");
}

private void button3_Click(object sender, System.EventArgs e)
{
number("3");
}

private void button10_Click(object sender, System.EventArgs e)
{
number("0");
}

private void button19_Click(object sender, System.EventArgs e)
{
textBox1.Text ="";a=0;b=0;
}

private void button11_Click(object sender, System.EventArgs e)
{
number(".");
}

private void button17_Click(object sender, System.EventArgs e)
{
if(textBox1.Text .Trim ().Length >0)
textBox1.Text =textBox1.Text.Trim().Substring (0,textBox1.Text.Trim().Length -1);

}
}
}