用C#写计算器程序（二）

    
  源程序
  
  //基本的计算器
  //蚕蛹 2001.11.26
  //Using C#
  //E-mail:sillnet@hotmail.com
  using System;
  using System.Drawing;
  using System.Collections;
  using System.ComponentModel;
  using System.Windows.Forms;
  
  namespace wincalc
  {
  ///
  /// Summary description for calcForm.
  ///
  public class calcForm : System.Windows.Forms.Form
  {
  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.Button button10;
  private System.Windows.Forms.Button bClr;
  private System.Windows.Forms.Button bDot;
  private System.Windows.Forms.Button bPlus;
  private System.Windows.Forms.Button bSub;
  private System.Windows.Forms.Button bMul;
  private System.Windows.Forms.Button bDiv;
  private System.Windows.Forms.Button bEqu;
  private System.Windows.Forms.TextBox txtCalc;
  
  //以下是要添加的代码
  //定义变量
  Double dblAcc;
  Double dblSec;
  bool blnClear,blnFrstOpen;
  String strOper;
  //以上是添加的代码
  ///
  /// Required designer variable.
  ///
  private System.ComponentModel.Container components = null;
  
  public calcForm()
  {
  //
  // Required for Windows Form Designer support
  //
  InitializeComponent();
  
  //
  // TODO: Add any constructor code after InitializeComponent call
  //
  
  //以下是要添加的代码
  //初始化设量
  dblAcc=0;
  dblSec=0;
  blnFrstOpen=true;
  blnClear=true;
  strOper=new string('=',1);
  //以上是添加的代码
  }
  
  ///
  /// Clean up any resources being used.
  ///
  protected override void Dispose( bool disposing )
  {
  if( disposing )
  {
  if(components != null)
  {
  components.Dispose();
  }
  }
  base.Dispose( disposing );
  }
  
  #region Windows Form Designer generated code
  ///
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  ///
  private void InitializeComponent()
  {
  this.bPlus = new System.Windows.Forms.Button();
  this.bMul = new System.Windows.Forms.Button();
  this.bDot = new System.Windows.Forms.Button();
  this.txtCalc = new System.Windows.Forms.TextBox();
  this.bClr = new System.Windows.Forms.Button();
  this.bDiv = new System.Windows.Forms.Button();
  this.bSub = new System.Windows.Forms.Button();
  this.button8 = new System.Windows.Forms.Button();
  this.button9 = new System.Windows.Forms.Button();
  this.bEqu = new System.Windows.Forms.Button();
  this.button10 = 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.button1 = new System.Windows.Forms.Button();
  this.button2 = new System.Windows.Forms.Button();
  this.button3 = new System.Windows.Forms.Button();
  this.SuspendLayout();
  //
  // bPlus
  //
  this.bPlus.BackColor = System.Drawing.SystemColors.Control;
  this.bPlus.ForeColor = System.Drawing.SystemColors.ControlText;
  this.bPlus.Location = new System.Drawing.Point(208, 112);
  this.bPlus.Name = "bPlus";
  this.bPlus.Size = new System.Drawing.Size(32, 80);
  this.bPlus.TabIndex = 1;
  this.bPlus.Text = "+";
  //以下是要添加的代码
  bPlus.Click += new System.EventHandler(this.btn_Oper);
  //以上是添加的代码
  //
  // bMul
  //
  this.bMul.Location = new System.Drawing.Point(160, 112);
  this.bMul.Name = "bMul";
  this.bMul.Size = new System.Drawing.Size(32, 32);
  this.bMul.TabIndex = 1;
  this.bMul.Text = "*";
  //以下是要添加的代码
  bMul.Click += new System.EventHandler(this.btn_Oper);
  //以上是添加的代码
  //
  // bDot
  //
  this.bDot.ForeColor = System.Drawing.Color.Black;
  this.bDot.Location = new System.Drawing.Point(112, 208);
  this.bDot.Name = "bDot";
  this.bDot.Size = new System.Drawing.Size(32, 32);
  this.bDot.TabIndex = 0;
  this.bDot.Text = ".";
  //以下是要添加的代码
  bDot.Click += new System.EventHandler(this.btn_clk);
  //以上是添加的代码
  //
  // txtCalc
  //
  this.txtCalc.Location = new System.Drawing.Point(16, 24);
  this.txtCalc.Name = "txtCalc";
  this.txtCalc.ReadOnly = true;
  this.txtCalc.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
  this.txtCalc.Size = new System.Drawing.Size(224, 21);
  this.txtCalc.TabIndex = 2;
  this.txtCalc.Text = "";
  //
  // bClr
  //
  this.bClr.BackColor = System.Drawing.SystemColors.Control;
  this.bClr.ForeColor = System.Drawing.SystemColors.ControlText;
  this.bClr.Location = new System.Drawing.Point(208, 64);
  this.bClr.Name = "bClr";
  this.bClr.Size = new System.Drawing.Size(32, 32);
  this.bClr.TabIndex = 0;
  this.bClr.Text = "AC";
  //以下是要添加的代码
  bClr.Click += new System.EventHandler(this.btn_clr);
  //以上是添加的代码
  //
  // bDiv
  //
  this.bDiv.Location = new System.Drawing.Point(160, 160);
  this.bDiv.Name = "bDiv";
  this.bDiv.Size = new System.Drawing.Size(32, 32);
  this.bDiv.TabIndex = 1;
  this.bDiv.Text = "/";
  //以下是要添加的代码
  bDiv.Click += new System.EventHandler(this.btn_Oper);
  //以上是添加的代码
  //
  // bSub
  //
  this.bSub.Location = new System.Drawing.Point(160, 64);
  this.bSub.Name = "bSub";
  this.bSub.Size = new System.Drawing.Size(32, 32);
  this.bSub.TabIndex = 1;
  this.bSub.Text