C#编写的windows计算器的实例代码

2013-07-23 10:29:55 投稿：shangke
这篇文章介绍了C#编写windows计算器的代码，有需要的朋友可以参考一下
using System;

using System.Drawing;

using System.Windows;

using System.Windows.Forms;

using System.Collections;

using System.ComponentModel;

using System.Data;

namespace comput

{

    /// <summary>

    /// 这是一个计算器的简单实现。

    /// </summary>

    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;

        /// <summary>

        /// 必需的设计器变量。

        /// </summary>

        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

            //

        }

        /// <summary>

        /// 清理所有正在使用的资源。

        /// </summary>

        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

        /// <summary>

        /// 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。

        /// </summary>

        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

            // 

            this.btn_5.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

            this.btn_5.ForeColor = System.Drawing.Color.Blue;

            this.btn_5.Location = new System.Drawing.Point(58, 80);

            this.btn_5.Name = "btn_5";

            this.btn_5.Size = new System.Drawing.Size(36, 29);

            this.btn_5.TabIndex = 27;

            this.btn_5.Tag = "5";

            this.btn_5.Text = "5";

            this.btn_5.Click += new System.EventHandler(this.btn_0_Click);

            // 

            // btn_4

            // 

            this.btn_4.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

            this.btn_4.ForeColor = System.Drawing.Color.Blue;

            this.btn_4.Location = new System.Drawing.Point(18, 80);

            this.btn_4.Name = "btn_4";

            this.btn_4.Size = new System.Drawing.Size(36, 29);

            this.btn_4.TabIndex = 26;

            this.btn_4.Tag = "4";

            this.btn_4.Text = "4";

            this.btn_4.Click += new System.EventHandler(this.btn_0_Click);

            // 

            // btn_sqrt

            // 

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

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

            this.btn_sqrt.Location = new System.Drawing.Point(18, 16);

            this.btn_sqrt.Name = "btn_sqrt";

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

            this.btn_sqrt.TabIndex = 25;

            this.btn_sqrt.Text = "sqrt";

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

            // 

            // btn_div

            // 

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

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

            this.btn_div.Location = new System.Drawing.Point(138, 48);

            this.btn_div.Name = "btn_div";

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

            this.btn_div.TabIndex = 24;

            this.btn_div.Text = "/";

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

            // 

            // btn_7

            // 

            this.btn_7.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

            this.btn_7.ForeColor = System.Drawing.Color.Blue;

            this.btn_7.Location = new System.Drawing.Point(18, 48);

            this.btn_7.Name = "btn_7";

            this.btn_7.Size = new System.Drawing.Size(36, 29);

            this.btn_7.TabIndex = 23;

            this.btn_7.Tag = "7";

            this.btn_7.Text = "7";

            this.btn_7.Click += new System.EventHandler(this.btn_0_Click);

            // 

            // btn_8

            // 

            this.btn_8.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

            this.btn_8.ForeColor = System.Drawing.Color.Blue;

            this.btn_8.Location = new System.Drawing.Point(58, 48);

            this.btn_8.Name = "btn_8";

            this.btn_8.Size = new System.Drawing.Size(36, 29);

            this.btn_8.TabIndex = 22;

            this.btn_8.Tag = "8";

            this.btn_8.Text = "8";

            this.btn_8.Click += new System.EventHandler(this.btn_0_Click);

            // 

            // btn_9

            // 

            this.btn_9.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

            this.btn_9.ForeColor = System.Drawing.Color.Blue;

            this.btn_9.Location = new System.Drawing.Point(98, 48);

            this.btn_9.Name = "btn_9";

            this.btn_9.Size = new System.Drawing.Size(36, 29);

            this.btn_9.TabIndex = 21;

            this.btn_9.Tag = "9";

            this.btn_9.Text = "9";

            this.btn_9.Click += new System.EventHandler(this.btn_0_Click);

            // 

            // btn_sqr

            // 

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

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

            this.btn_sqr.Location = new System.Drawing.Point(98, 16);

            this.btn_sqr.Name = "btn_sqr";

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

            this.btn_sqr.TabIndex = 19;

            this.btn_sqr.Text = "sqr";

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

            // 

            // mainMenu1

            // 

            this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                      this.menuItem8,

                                                                                      this.menuItem1,

                                                                                      this.menuItem4});

            // 

            // menuItem1

            // 

            this.menuItem1.Index = 1;

            this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                      this.menuItem2,

                                                                                      this.menuItem3});

            this.menuItem1.Text = "编辑(&E)";

            // 

            // menuItem2

            // 

            this.menuItem2.Index = 0;

            this.menuItem2.Text = "复制(&C)";

            this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);

            // 

            // menuItem3

            // 

            this.menuItem3.Index = 1;

            this.menuItem3.Text = "粘贴(&P)";

            this.menuItem3.Click += new System.EventHandler(this.menuItem3_Click);

            // 

            // menuItem4

            // 

            this.menuItem4.Index = 2;

            this.menuItem4.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                      this.menuItem5,

                                                                                      this.menuItem6});

            this.menuItem4.Text = "帮助(&H)";

            // 

            // menuItem5

            // 

            this.menuItem5.Index = 0;

            this.menuItem5.Text = "帮助主题(&H)";

            this.menuItem5.Click += new System.EventHandler(this.menuItem5_Click);

            // 

            // menuItem6

            // 

            this.menuItem6.Index = 1;

            this.menuItem6.Text = "关于(&A)";

            this.menuItem6.Click += new System.EventHandler(this.menuItem6_Click);

            // 

            // menuItem8

            // 

            this.menuItem8.Index = 0;

            this.menuItem8.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                      this.menuItem9,

                                                                                      this.menuItem10});

            this.menuItem8.Text = "文件(&F)";

            // 

            // menuItem9

            // 

            this.menuItem9.Index = 0;

            this.menuItem9.Text = "打开windows计算器(&O)";

            this.menuItem9.Click += new System.EventHandler(this.menuItem9_Click);

            // 

            // menuItem10

            // 

            this.menuItem10.Index = 1;

            this.menuItem10.Text = "退出(&Q)";

            this.menuItem10.Click += new System.EventHandler(this.menuItem10_Click);

            // 

            // Form1

            // 

            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

            this.ClientSize = new System.Drawing.Size(278, 239);

            this.Controls.Add(this.groupBox1);

            this.Controls.Add(this.txtShow);

            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;

            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));

            this.MaximizeBox = false;

            this.Menu = this.mainMenu1;

            this.Name = "Form1";

            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;

            this.Text = "计算器";

            this.groupBox1.ResumeLayout(false);

            this.ResumeLayout(false);

        }

        #endregion

        #region 各变量和常数的声明

        public const int NULL = 0;      // 定义操作码

        public const int ADD = 1;     //表示加

        public const int SUB = 2;     //减

        public const int MUL = 3;     //乘

        public const int DIV = 4;    //除

        public const int SQR = 5;    //求平方

        public const int SQRT = 6;   //求平方根

        public const int NODOT  = 0;     // 定义是否点击了小数点,0 为没点

        public const int HASDOT = 1;

        private double res = 0;         // 记录结果数

        private double tmp = 0;         // 当前输入的操作数

        private int opt = NULL;         // 记录操作码

        private int dot = NODOT;    // 记录是否点击了小数点,0为没有点

        private int num = 0;        // 记录输入操作数的个数

        private int dotnum = 0;        // 记录小数点部分的个数        

        string strOper;            //获取操作符

        #endregion

        /// <summary>

        /// 应用程序的主入口点。

        /// </summary>

        [STAThread]

        static void Main() 

        {

            Application.Run(new Form1());

        }

        /// <summary>

        #region 获取操作数事件

        //获取操作数事件

        private void btn_0_Click(object sender, System.EventArgs e)

        {

            System.Windows.Forms.Button btnTmp;

            double i;

            btnTmp = sender as System.Windows.Forms.Button;            

            if (btnTmp != null)

            {

                if (dot == NODOT)

                {

                    // 没有点击小数点

                    i = double.Parse(btnTmp.Tag.ToString()); //取用户自定义的控件关联数,并转换成double型

                    tmp = tmp * 10 + i;

                    txtShow.Text = tmp.ToString();   //将其放入文本显示屏啊

                }

                else   // 点击了小数点

                {                    

                    dotnum++;    //记录小数点部分的个数

                                                       // 生成小数部分的新的数值

                    i = double.Parse(btnTmp.Tag.ToString()) / System.Math.Pow(10,dotnum);

                    tmp = tmp + i;  //将小数点后的值加到当前操做数

                    txtShow.Text = tmp.ToString();

                }

            }

        }

        #endregion

        #region 等于事件和等于运算方法

        //等于事件

        private void btn_equ_Click(object sender, System.EventArgs e)

        {

            calc();

        }

        //等于运算方法

        private void calc()

        {

            // 生成结果

            if (num == 0 )    //是否有操作数,没有就返回0

            {

                res = 0;

                tmp = 0;

                txtShow.Text = res.ToString();

                return;

            }

            switch (opt)  //找到对应的运算符进行计算

            {

                    // 加法

                case ADD:

                    res = res + tmp;                    

                    break;

                    // 减法

                case SUB:

                    res = res - tmp;                    

                    break;

                    // 乘法

                case MUL:

                    res = res * tmp;                    

                    break;

                    // 除法

                case DIV:

                    res = res / tmp;                    

                    break;

                    // 平方

                case SQR:

                    res = tmp * tmp;                    

                    break;

                    // 平方根

                case SQRT:

                    res = System.Math.Sqrt(tmp);                    

                    break;

                default:

                    return;

            }

            txtShow.Text = res.ToString();   //结果输出到文本显示屏

            opt = NULL;  //运算符清空

            tmp=0;    

            dot = NODOT;

                    //res = 0;

                    //num = 0;

        }

        #endregion

        #region 获取操作符运事件

        //获取操作符运事件

        private void btn_Oper(object obj,EventArgs ea)

        {

            Button tmp1=(Button)obj;

            strOper=tmp1.Text;

            switch (strOper)

            {

                case "/":       //除法运算

                    if(opt!=NULL&&opt!=DIV)

                    {

                        calc();

                    }

                    opt = DIV;

                    if (num != 0)  //判断操作数的个数,如果两个就做二元运算

                    {

                        if (tmp != 0)

                            res = res / tmp;

                    }

                    else

                        res = tmp;

                    num++;                      

                    tmp = 0;

                    txtShow.Text = res.ToString();

                    dot = NODOT;

                    break;

                case "*":

                    // 乘法运算

                    if(opt!=NULL&&opt!=MUL)

                    {

                        calc();

                    }

                    opt = MUL;

                    if (num!= 0 )     //判断操作数的个数,如果两个就做二元运算    

                    {

                            if(tmp!=0)

                         res = res * tmp;

                    }

                    else

                        res = tmp;

                    num++;                                      

                    tmp = 0;

                    txtShow.Text = res.ToString();

                    dot = NODOT;

                    break;

                case "+":            //加法运算

                    if(opt!=NULL&&opt!=ADD)

                    {

                        calc();

                    }

                    opt = ADD;

                    if (num != 0)    //判断操作数的个数,如果两个就做二元运算

                        res = res + tmp;

                    else

                        res = tmp;

                    num++;                    

                    tmp = 0;

                    txtShow.Text = res.ToString();

                    dot = NODOT;

                    break;

                case "-":        //减法运算

                    if(opt!=NULL&&opt!=SUB)

                    {

                        calc();

                    }

                    /*if(opt==ADD)

                    {

                        res=res+tmp;

                        tmp=0;

                    }*/

                    opt = SUB;

                    if (num != 0)    //判断操作数的个数,如果两个就做二元运算

                        res = res - tmp;

                    else

                        res = tmp;

                    num++;                     

                    tmp = 0;

                    txtShow.Text = res.ToString();

                    dot = NODOT;

                    break;

                case "sqrt":     //平方根运算

                    if(opt!=NULL)

                    {

                        calc();

                    }

                    //opt=SQRT;

                    if (tmp > 0)  //要求操作数大于0

                    {

                        res = Math.Sqrt(tmp);

                        //res=tmp;

                    }

                    else if(res>0)

                        res= Math.Sqrt(res);

                        txtShow.Text =res.ToString();

                    num++;    

                    tmp=0;

                    dot = NODOT;

                    break;

                case "sqr":

                    // 平方运算

                    if(opt!=NULL)

                    {

                        calc();

                    }

                    //opt=SQR;

                    if (tmp != 0)

                    {

                        res = tmp * tmp;

                        //res=tmp;

                    }

                    else

                        res=res*res;

                    txtShow.Text = res.ToString();

                    num++;    

                    tmp=0;

                    dot = NODOT;

                    break;

                case "1/x":  //倒数运算

                    if(opt!=NULL)

                    {

                        calc();

                    }

                    if (tmp != 0)

                    {

                        res = 1 / tmp;

                        //res=tmp;

                    }

                    else                    

                    res=1/res;

                    txtShow.Text = res.ToString();

                    tmp=0;

                    dot = NODOT;

                    break;

                case ".":

                            // 点击了小数点

                    if(dot==HASDOT)

                        return;

                    else

                    {

                        dot = HASDOT;

                        dotnum = 0;

                    }                    

                    break;

                case "+/-":

                                // 点击了符号运算

                    if(tmp!=0)

                    {

                        tmp = -tmp;

                        txtShow.Text = tmp.ToString();

                    }

                    else

                    {

                        res=-res;

                        //res=tmp;

                        txtShow.Text = res.ToString();    

                    }

                    dot = NODOT;

                    break;    

                case "CE":     //清除运算

                    res = 0;         // 记录结果数

                    tmp = 0;         // 当前输入的操作数

                    opt = NULL;         // 记录操作码

                    dot = NODOT;    // 记录是否点击了小数点

                    num = 0;        // 记录输入操作数的个数

                    dotnum = 0;        // 记录小数点部分的个数

                    txtShow.Text="";                    

                    break;

                case "C":         //清除运算

                    res = 0;         // 记录结果数

                    tmp = 0;         // 当前输入的操作数

                    opt = NULL;         // 记录操作码

                    dot = NODOT;    // 记录是否点击了小数点

                    num = 0;        // 记录输入操作数的个数

                    dotnum = 0;        // 记录小数点部分的个数

                    txtShow.Text="";

                    break;

            }

        }

        #endregion

        #region     主菜单事件

        //打开关于主题---调用windows xp中计算器的帮助

        private void menuItem5_Click(object sender, System.EventArgs e)

        {

            Help.ShowHelp(this,"C:\\WINDOWS\\Help\\calc.chm");        

        }

        //打开于我们

        private void menuItem6_Click(object sender, System.EventArgs e)

        {

            Form2 fm=new Form2();

            fm.Show();

        }

        //复制

        private void menuItem2_Click(object sender, System.EventArgs e)

        {

            if(txtShow.SelectionLength>0)

            {

                txtShow.Copy();

            }

        }

        //

       //粘贴

        private void menuItem3_Click(object sender, System.EventArgs e)

        {

            txtShow.Paste();

        }

          //调用windows xp中的计算器

        private void menuItem9_Click(object sender, System.EventArgs e)

        {

             Help.ShowHelp(this,"C:\\WINDOWS\\system32\\calc.exe");

        }

        //退出

        private void menuItem10_Click(object sender, System.EventArgs e)

        {

            Application.Exit();

        }

        #endregion

    }

}
PS：这里再为大家推荐两款本站的在线计算器，都是采用js实现，相信对大家有一定借鉴作用：
在线标准计算器：http://tools.jb51.net/jisuanqi/jsq
在线科学计算器：http://tools.jb51.net/jisuanqi/jsqkexue
C#编写的windows计算器的实例代码

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