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

  
 }
}