用C#编写一个windows计算器

　　using System;

　　using System.Drawing;

　　using System.Windows;

　　using System.Windows.Forms;

　　using System.Collections;

　　using System.ComponentModel;

　　using System.Data;

　　namespace comput

　　{

　　///

　　/// 这是一个计算器的简单实现。

　　///

　　public class Form1 : System.Windows.Forms.Form

　　{

　　#region 控件声明

　　private System.Windows.Forms.TextBox txtShow;

　　private System.Windows.Forms.GroupBox groupBox1;

　　private System.Windows.Forms.Button btn_rev;

　　private System.Windows.Forms.Button btn_dot;

　　private System.Windows.Forms.Button btn_add;

　　private System.Windows.Forms.Button btn_equ;

　　private System.Windows.Forms.Button btn_sign;

　　private System.Windows.Forms.Button btn_sub;

　　private System.Windows.Forms.Button btn_mul;

　　private System.Windows.Forms.Button btn_0;

　　private System.Windows.Forms.Button btn_3;

　　private System.Windows.Forms.Button btn_2;

　　private System.Windows.Forms.Button btn_1;

　　private System.Windows.Forms.Button btn_6;

　　private System.Windows.Forms.Button btn_5;

　　private System.Windows.Forms.Button btn_4;

　　private System.Windows.Forms.Button btn_sqrt;

　　private System.Windows.Forms.Button btn_div;

　　private System.Windows.Forms.Button btn_7;

　　private System.Windows.Forms.Button btn_8;

　　private System.Windows.Forms.Button btn_9;

　　private System.Windows.Forms.MainMenu mainMenu1;

　　private System.Windows.Forms.MenuItem menuItem1;

　　private System.Windows.Forms.Button btn_sqr;

　　private System.Windows.Forms.MenuItem menuItem2;

　　private System.Windows.Forms.MenuItem menuItem3;

　　private System.Windows.Forms.MenuItem menuItem4;

　　private System.Windows.Forms.MenuItem menuItem5;

　　private System.Windows.Forms.MenuItem menuItem6;

　　private System.Windows.Forms.Button c;

　　private System.Windows.Forms.Button ce;

　　private System.Windows.Forms.MenuItem menuItem8;

　　private System.Windows.Forms.MenuItem menuItem9;

　　private System.Windows.Forms.MenuItem menuItem10;

　　///

　　/// 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 );

　　}

　　#endregion

　　#region 各控件的属性的方法Windows Form Designer generated code

　　///

　　/// 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()

　　{

　　System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));

　　this.txtShow = new System.Windows.Forms.TextBox();

　　this.groupBox1 = new System.Windows.Forms.GroupBox();

　　this.c = new System.Windows.Forms.Button();

　　this.ce = new System.Windows.Forms.Button();

　　this.btn_rev = new System.Windows.Forms.Button();

　　this.btn_dot = new System.Windows.Forms.Button();

　　this.btn_add = new System.Windows.Forms.Button();

　　this.btn_equ = new System.Windows.Forms.Button();

　　this.btn_sign = new System.Windows.Forms.Button();

　　this.btn_sub = new System.Windows.Forms.Button();

　　this.btn_mul = new System.Windows.Forms.Button();

　　this.btn_0 = new System.Windows.Forms.Button();

　　this.btn_3 = new System.Windows.Forms.Button();

　　this.btn_2 = new System.Windows.Forms.Button();

　　this.btn_1 = new System.Windows.Forms.Button();

　　this.btn_6 = new System.Windows.Forms.Button();

　　this.btn_5 = new System.Windows.Forms.Button();

　　this.btn_4 = new System.Windows.Forms.Button();

　　this.btn_sqrt = new System.Windows.Forms.Button();

　　this.btn_div = new System.Windows.Forms.Button();

　　this.btn_7 = new System.Windows.Forms.Button();

　　this.btn_8 = new System.Windows.Forms.Button();

　　this.btn_9 = new System.Windows.Forms.Button();

　　this.btn_sqr = new System.Windows.Forms.Button();

　　this.mainMenu1 = new System.Windows.Forms.MainMenu();

　　this.menuItem1 = new System.Windows.Forms.MenuItem();

　　this.menuItem2 = new System.Windows.Forms.MenuItem();

　　this.menuItem3 = new System.Windows.Forms.MenuItem();

　　this.menuItem4 = new System.Windows.Forms.MenuItem();

　　this.menuItem5 = new System.Windows.Forms.MenuItem();

　　this.menuItem6 = new System.Windows.Forms.MenuItem();

　　this.menuItem8 = new System.Windows.Forms.MenuItem();

　　this.menuItem9 = new System.Windows.Forms.MenuItem();

　　this.menuItem10 = new System.Windows.Forms.MenuItem();

　　this.groupBox1.SuspendLayout();

　　this.SuspendLayout();

　　//

　　// txtShow

　　//

　　this.txtShow.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(192)), ((System.Byte)(192)), ((System.Byte)(255)));

　　this.txtShow.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.txtShow.ForeColor = System.Drawing.Color.Purple;

　　this.txtShow.Location = new System.Drawing.Point(25, 8);

　　this.txtShow.Name = "txtShow";

　　this.txtShow.Size = new System.Drawing.Size(228, 23);

　　this.txtShow.TabIndex = 1;

　　this.txtShow.Text = "0.";

　　this.txtShow.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;

　　//

　　// groupBox1

　　//

　　this.groupBox1.Controls.Add(this.c);

　　this.groupBox1.Controls.Add(this.ce);

　　this.groupBox1.Controls.Add(this.btn_rev);

　　this.groupBox1.Controls.Add(this.btn_dot);

　　this.groupBox1.Controls.Add(this.btn_add);

　　this.groupBox1.Controls.Add(this.btn_equ);

　　this.groupBox1.Controls.Add(this.btn_sign);

　　this.groupBox1.Controls.Add(this.btn_sub);

　　this.groupBox1.Controls.Add(this.btn_mul);

　　this.groupBox1.Controls.Add(this.btn_0);

　　this.groupBox1.Controls.Add(this.btn_3);

　　this.groupBox1.Controls.Add(this.btn_2);

　　this.groupBox1.Controls.Add(this.btn_1);

　　this.groupBox1.Controls.Add(this.btn_6);

　　this.groupBox1.Controls.Add(this.btn_5);

　　this.groupBox1.Controls.Add(this.btn_4);

　　this.groupBox1.Controls.Add(this.btn_sqrt);

　　this.groupBox1.Controls.Add(this.btn_div);

　　this.groupBox1.Controls.Add(this.btn_7);

　　this.groupBox1.Controls.Add(this.btn_8);

　　this.groupBox1.Controls.Add(this.btn_9);

　　this.groupBox1.Controls.Add(this.btn_sqr);

　　this.groupBox1.Location = new System.Drawing.Point(24, 40);

　　this.groupBox1.Name = "groupBox1";

　　this.groupBox1.Size = new System.Drawing.Size(232, 184);

　　this.groupBox1.TabIndex = 21;

　　this.groupBox1.TabStop = false;

　　this.groupBox1.Text = "计算机区";

　　//

　　// c

　　//

　　this.c.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.c.ForeColor = System.Drawing.Color.Red;

　　this.c.Location = new System.Drawing.Point(178, 48);

　　this.c.Name = "c";

　　this.c.Size = new System.Drawing.Size(36, 61);

　　this.c.TabIndex = 41;

　　this.c.Text = "C";

　　this.c.Click += new System.EventHandler(this.btn_Oper);

　　//

　　// ce

　　//

　　this.ce.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.ce.ForeColor = System.Drawing.Color.Red;

　　this.ce.Location = new System.Drawing.Point(138, 16);

　　this.ce.Name = "ce";

　　this.ce.Size = new System.Drawing.Size(76, 29);

　　this.ce.TabIndex = 40;

　　this.ce.Text = "CE";

　　this.ce.Click += new System.EventHandler(this.btn_Oper);

　　//

　　// btn_rev

　　//

　　this.btn_rev.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_rev.ForeColor = System.Drawing.Color.Blue;

　　this.btn_rev.Location = new System.Drawing.Point(178, 112);

　　this.btn_rev.Name = "btn_rev";

　　this.btn_rev.Size = new System.Drawing.Size(36, 29);

　　this.btn_rev.TabIndex = 39;

　　this.btn_rev.Text = "1/x";

　　this.btn_rev.Click += new System.EventHandler(this.btn_Oper);

　　//

　　// btn_dot

　　//

　　this.btn_dot.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_dot.Location = new System.Drawing.Point(98, 144);

　　this.btn_dot.Name = "btn_dot";

　　this.btn_dot.Size = new System.Drawing.Size(36, 29);

　　this.btn_dot.TabIndex = 38;

　　this.btn_dot.Tag = "0";

　　this.btn_dot.Text = ".";

　　this.btn_dot.Click += new System.EventHandler(this.btn_Oper);

　　//

　　// btn_add

　　//

　　this.btn_add.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_add.ForeColor = System.Drawing.Color.Red;

　　this.btn_add.Location = new System.Drawing.Point(138, 144);

　　this.btn_add.Name = "btn_add";

　　this.btn_add.Size = new System.Drawing.Size(36, 29);

　　this.btn_add.TabIndex = 37;

　　this.btn_add.Text = "+";

　　this.btn_add.Click += new System.EventHandler(this.btn_Oper);

　　//

　　// btn_equ

　　//

　　this.btn_equ.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_equ.ForeColor = System.Drawing.Color.Red;

　　this.btn_equ.Location = new System.Drawing.Point(178, 144);

　　this.btn_equ.Name = "btn_equ";

　　this.btn_equ.Size = new System.Drawing.Size(36, 29);

　　this.btn_equ.TabIndex = 36;

　　this.btn_equ.Text = "=";

　　this.btn_equ.Click += new System.EventHandler(this.btn_equ_Click);

　　//

　　// btn_sign

　　//

　　this.btn_sign.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_sign.ForeColor = System.Drawing.Color.Blue;

　　this.btn_sign.Location = new System.Drawing.Point(58, 144);

　　this.btn_sign.Name = "btn_sign";

　　this.btn_sign.Size = new System.Drawing.Size(36, 29);

　　this.btn_sign.TabIndex = 35;

　　this.btn_sign.Text = "+/-";

　　this.btn_sign.Click += new System.EventHandler(this.btn_Oper);

　　//

　　// btn_sub

　　//

　　this.btn_sub.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_sub.ForeColor = System.Drawing.Color.Red;

　　this.btn_sub.Location = new System.Drawing.Point(138, 112);

　　this.btn_sub.Name = "btn_sub";

　　this.btn_sub.Size = new System.Drawing.Size(36, 29);

　　this.btn_sub.TabIndex = 34;

　　this.btn_sub.Text = "-";

　　this.btn_sub.Click += new System.EventHandler(this.btn_Oper);

　　//

　　// btn_mul

　　//

　　this.btn_mul.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_mul.ForeColor = System.Drawing.Color.Red;

　　this.btn_mul.Location = new System.Drawing.Point(138, 80);

　　this.btn_mul.Name = "btn_mul";

　　this.btn_mul.Size = new System.Drawing.Size(36, 29);

　　this.btn_mul.TabIndex = 33;

　　this.btn_mul.Text = "*";

　　this.btn_mul.Click += new System.EventHandler(this.btn_Oper);

　　//

　　// btn_0

　　//

　　this.btn_0.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_0.ForeColor = System.Drawing.Color.Blue;

　　this.btn_0.Location = new System.Drawing.Point(18, 144);

　　this.btn_0.Name = "btn_0";

　　this.btn_0.Size = new System.Drawing.Size(36, 29);

　　this.btn_0.TabIndex = 32;

　　this.btn_0.Tag = "0";

　　this.btn_0.Text = "0";

　　this.btn_0.Click += new System.EventHandler(this.btn_0_Click);

　　//

　　// btn_3

　　//

　　this.btn_3.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_3.ForeColor = System.Drawing.Color.Blue;

　　this.btn_3.Location = new System.Drawing.Point(98, 112);

　　this.btn_3.Name = "btn_3";

　　this.btn_3.Size = new System.Drawing.Size(36, 29);

　　this.btn_3.TabIndex = 31;

　　this.btn_3.Tag = "3";

　　this.btn_3.Text = "3";

　　this.btn_3.Click += new System.EventHandler(this.btn_0_Click);

　　//

　　// btn_2

　　//

　　this.btn_2.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_2.ForeColor = System.Drawing.Color.Blue;

　　this.btn_2.Location = new System.Drawing.Point(58, 112);

　　this.btn_2.Name = "btn_2";

　　this.btn_2.Size = new System.Drawing.Size(36, 29);

　　this.btn_2.TabIndex = 30;

　　this.btn_2.Tag = "2";

　　this.btn_2.Text = "2";

　　this.btn_2.Click += new System.EventHandler(this.btn_0_Click);

　　//

　　// btn_1

　　//

　　this.btn_1.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_1.ForeColor = System.Drawing.Color.Blue;

　　this.btn_1.Location = new System.Drawing.Point(18, 112);

　　this.btn_1.Name = "btn_1";

　　this.btn_1.Size = new System.Drawing.Size(36, 29);

　　this.btn_1.TabIndex = 29;

　　this.btn_1.Tag = "1";

　　this.btn_1.Text = "1";

　　this.btn_1.Click += new System.EventHandler(this.btn_0_Click);

　　//

　　// btn_6

　　//

　　this.btn_6.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

　　this.btn_6.ForeColor = System.Drawing.Color.Blue;

　　this.btn_6.Location = new System.Drawing.Point(98, 80);

　　this.btn_6.Name = "btn_6";

　　this.btn_6.Size = new System.Drawing.Size(36, 29);

　　this.btn_6.TabIndex = 28;

　　this.btn_6.Tag = "6";

　　this.btn_6.Text = "6";

　　this.btn_6.Click += new System.EventHandler(this.btn_0_Click);

　　//

　　// btn_5

　　//