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

/// <summary> 
/// Form1 的摘要说明。 
/// </summary> 
public class Form1: System.Windows.Forms.Form 

private System.Windows.Forms.TextBox textBox1; 
private System.Windows.Forms.Button button2; 
private System.Windows.Forms.Button button3; 
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 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 button17; 
private System.Windows.Forms.Button button18; 
private System.Windows.Forms.Button button19; 
private System.Windows.Forms.Button button20; 
private System.Windows.Forms.Button button21; 
private System.Windows.Forms.Button button23; 
private System.Windows.Forms.Button button24; 
private System.Windows.Forms.Button button25; 
private System.Windows.Forms.Button button26; 
private System.Windows.Forms.Button button27; Double dblAcc; 
Double dblSec; 
bool blnClear,blnFrstOpen; 
String strOper; //操作符字符串 /// <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(); 
dblAcc=0; 
dblSec=0; 
blnClear=true; 
blnFrstOpen=true; 
//strOper=new string(""); 
// 
// 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 ); 
} #region 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() 

this.textBox1 = new System.Windows.Forms.TextBox(); 
this.button2 = new System.Windows.Forms.Button(); 
this.button3 = 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.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.button17 = new System.Windows.Forms.Button(); 
this.button18 = new System.Windows.Forms.Button(); 
this.button19 = new System.Windows.Forms.Button(); 
this.button20 = new System.Windows.Forms.Button(); 
this.button21 = new System.Windows.Forms.Button(); 
this.button23 = new System.Windows.Forms.Button(); 
this.button24 = new System.Windows.Forms.Button(); 
this.button25 = new System.Windows.Forms.Button(); 
this.button26 = new System.Windows.Forms.Button(); 
this.button27 = new System.Windows.Forms.Button(); 
this.SuspendLayout(); 
// 
// textBox1 
// 
this.textBox1.Location = new System.Drawing.Point(8, 16); 
this.textBox1.Name = "textBox1"; 
this.textBox1.ReadOnly = true; 
this.textBox1.RightToLeft = System.Windows.Forms.RightToLeft.Yes; 
this.textBox1.Size = new System.Drawing.Size(224, 21); 
this.textBox1.TabIndex = 0; 
this.textBox1.Text = ""; 
// 
// button2 
// 
this.button2.Location = new System.Drawing.Point(8, 48); 
this.button2.Name = "button2"; 
this.button2.Size = new System.Drawing.Size(104, 32); 
this.button2.TabIndex = 2; 
this.button2.Text = "CE"; 
// 
// button3 
// 
this.button3.Location = new System.Drawing.Point(128, 48); 
this.button3.Name = "button3"; 
this.button3.Size = new System.Drawing.Size(104, 32); 
this.button3.TabIndex = 3; 
this.button3.Text = "C"; 
this.button3.Click += new System.EventHandler(this.btn_clr); 
// 
// button5 
// 
this.button5.Location = new System.Drawing.Point(8, 88); 
this.button5.Name = "button5"; 
this.button5.Size = new System.Drawing.Size(32, 24); 
this.button5.TabIndex = 5; 
this.button5.Text = "7"; 
this.button5.Click += new System.EventHandler(this.btn_clk); 
// 
// button6 
// 
this.button6.Location = new System.Drawing.Point(56, 88); 
this.button6.Name = "button6"; 
this.button6.Size = new System.Drawing.Size(32, 24); 
this.button6.TabIndex = 6; 
this.button6.Text = "8"; 
this.button6.Click += new System.EventHandler(this.btn_clk); 
// 
// button7 
// 
this.button7.Location = new System.Drawing.Point(104, 88); 
this.button7.Name = "button7"; 
this.button7.Size = new System.Drawing.Size(32, 24); 
this.button7.TabIndex = 7; 
this.button7.Text = "9"; 
this.button7.Click += new System.EventHandler(this.btn_clk); 
// 
// button8 
// 
this.button8.Location = new System.Drawing.Point(152, 88); 
this.button8.Name = "button8"; 
this.button8.Size = new System.Drawing.Size(32, 23); 
this.button8.TabIndex = 8; 
this.button8.Text = "/"; 
this.button8.Click += new System.EventHandler(this.btn_Oper); 
// 
// button9 
// 
this.button9.Location = new System.Drawing.Point(200, 88); 
this.button9.Name = "button9"; 
this.button9.Size = new System.Drawing.Size(32, 24); 
this.button9.TabIndex = 9; 
this.button9.Text = "sqr"; 
this.button9.Click += new System.EventHandler(this.btn_Oper); 
// 
// button11 
// 
this.button11.Location = new System.Drawing.Point(8, 120); 
this.button11.Name = "button11"; 
this.button11.Size = new System.Drawing.Size(32, 24); 
this.button11.TabIndex = 11; 
this.button11.Text = "4"; 
this.button11.Click += new System.EventHandler(this.btn_clk); 
// 
// button12 
// 
this.button12.Location = new System.Drawing.Point(56, 120); 
this.button12.Name = "button12"; 
this.button12.Size = new System.Drawing.Size(32, 24); 
this.button12.TabIndex = 12; 
this.button12.Text = "5"; 
this.button12.Click += new System.EventHandler(this.btn_clk); 
// 
// button13 
// 
this.button13.Location = new System.Drawing.Point(104, 120); 
this.button13.Name = "button13"; 
this.button13.Size = new System.Drawing.Size(32, 23); 
this.button13.TabIndex = 13; 
this.button13.Text = "6"; 
this.button13.Click += new System.EventHandler(this.btn_clk); 
// 
// button14 
// 
this.button14.Location = new System.Drawing.Point(152, 120); 
this.button14.Name = "button14"; 
this.button14.Size = new System.Drawing.Size(32, 24); 
this.button14.TabIndex = 14; 
this.button14.Text = "*"; 
this.button14.Click += new System.EventHandler(this.btn_Oper); 
// 
// button15 
// 
this.button15.Location = new System.Drawing.Point(200, 120); 
this.button15.Name = "button15"; 
this.button15.Size = new System.Drawing.Size(32, 24); 
this.button15.TabIndex = 15; 
this.button15.Text = "%"; 
// 
// button17 
// 
this.button17.Location = new System.Drawing.Point(8, 152); 
this.button17.Name = "button17"; 
this.button17.Size = new System.Drawing.Size(32, 24); 
this.button17.TabIndex = 17; 
this.button17.Text = "1"; 
this.button17.Click += new System.EventHandler(this.btn_clk); 
// 
// button18 
// 
this.button18.Location = new System.Drawing.Point(56, 152); 
this.button18.Name = "button18"; 
this.button18.Size = new System.Drawing.Size(32, 24); 
this.button18.TabIndex = 18; 
this.button18.Text = "2"; 
this.button18.Click += new System.EventHandler(this.btn_clk); 
/// <summary> 
/// 应用程序的主入口点。 
/// </summary> 
[STAThread] 
//判断字符的输入 
private void btn_clk(object obj,EventArgs ea) 

if(blnClear)textBox1.Text=""; 
Button b1=(Button)obj; 
textBox1.Text+=b1.Text; 
if(textBox1.Text==".")textBox1.Text="0."; 
dblSec=Convert.ToDouble(textBox1.Text); 
blnClear=false; 

static void Main() 

Application.Run(new Form1()); 

private void btn_Oper(object obj,EventArgs ea) 

Button b2=(Button)obj; 
strOper=b2.Text; 
if(blnFrstOpen)dblAcc=dblSec; 
else calc(); 
blnFrstOpen=false; 
blnClear=true; 

//等号运算 
private void btn_equ(object obj,EventArgs ea) 

calc(); 

//所有运算操作 
private void calc() 

switch(strOper) 

case "+": 
dblAcc+=dblSec; //加号运算 
break; 
case "-": 
dblAcc-=dblSec; //减号运算 
break; 
case "*": 
dblAcc*=dblSec; //乘号运算 
break; 
case "/": 
dblAcc/=dblSec; //除号运算 
break; 
case "sqr": 
dblAcc=Math.Sqrt(dblAcc); //开方运算 
break; 
case "%": 
dblAcc%=dblSec; //余数运算 
break; 
case "+/-": 
dblAcc=(-1)*dblAcc; //取负数运算 
break; 
case "1/x": 
dblAcc=1/dblAcc; //余数运算 
break; 

strOper="="; //等号运算 
blnFrstOpen=true; 
textBox1.Text=Convert.ToString(dblAcc);//将运算结果转换成字符类型,并输出 
dblSec=dblAcc;//将运算数A的值放入运算数B中,以便后面运算 

//清除按钮 
private void btn_clr(object obj,EventArgs ea) 

clear(); 

//清除按钮的操作 
private void clear() 

dblAcc=0; 
dblSec=0; 
blnFrstOpen=true; 
textBox1.Text=""; 
textBox1.Focus(); //设置焦点为txtCalc 


}

解决方案 »

  1.   

    // 
    // button19 
    // 
    this.button19.Location = new System.Drawing.Point(104, 152); 
    this.button19.Name = "button19"; 
    this.button19.Size = new System.Drawing.Size(32, 24); 
    this.button19.TabIndex = 19; 
    this.button19.Text = "3"; 
    this.button19.Click += new System.EventHandler(this.btn_clk); 
    // 
    // button20 
    // 
    this.button20.Location = new System.Drawing.Point(152, 152); 
    this.button20.Name = "button20"; 
    this.button20.Size = new System.Drawing.Size(32, 24); 
    this.button20.TabIndex = 20; 
    this.button20.Text = "-"; 
    this.button20.Click += new System.EventHandler(this.btn_Oper); 
    // 
    // button21 
    // 
    this.button21.Location = new System.Drawing.Point(200, 152); 
    this.button21.Name = "button21"; 
    this.button21.Size = new System.Drawing.Size(32, 24); 
    this.button21.TabIndex = 21; 
    this.button21.Text = "1/x"; 
    this.button21.Click += new System.EventHandler(this.btn_Oper); 
    // 
    // button23 
    // 
    this.button23.Location = new System.Drawing.Point(8, 184); 
    this.button23.Name = "button23"; 
    this.button23.Size = new System.Drawing.Size(32, 24); 
    this.button23.TabIndex = 23; 
    this.button23.Text = "0"; 
    this.button23.Click += new System.EventHandler(this.btn_clk); 
    // 
    // button24 
    // 
    this.button24.Location = new System.Drawing.Point(56, 184); 
    this.button24.Name = "button24"; 
    this.button24.Size = new System.Drawing.Size(32, 24); 
    this.button24.TabIndex = 24; 
    this.button24.Text = "+/-"; 
    this.button24.Click += new System.EventHandler(this.btn_Oper); 
    // 
    // button25 
    // 
    this.button25.Location = new System.Drawing.Point(104, 184); 
    this.button25.Name = "button25"; 
    this.button25.Size = new System.Drawing.Size(32, 24); 
    this.button25.TabIndex = 25; 
    this.button25.Text = "."; 
    // 
    // button26 
    // 
    this.button26.Location = new System.Drawing.Point(152, 184); 
    this.button26.Name = "button26"; 
    this.button26.Size = new System.Drawing.Size(32, 24); 
    this.button26.TabIndex = 26; 
    this.button26.Text = "+"; 
    this.button26.Click += new System.EventHandler(this.btn_Oper); 
    // 
    // button27 
    // 
    this.button27.Location = new System.Drawing.Point(200, 184); 
    this.button27.Name = "button27"; 
    this.button27.Size = new System.Drawing.Size(32, 24); 
    this.button27.TabIndex = 27; 
    this.button27.Text = "="; 
    this.button27.Click += new System.EventHandler(this.btn_equ); 
    // 
    // Form1 
    // 
    this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); 
    this.ClientSize = new System.Drawing.Size(248, 213); 
    this.Controls.AddRange(new System.Windows.Forms.Control[] { 
    this.button27, 
    this.button26, 
    this.button25, 
    this.button24, 
    this.button23, 
    this.button21, 
    this.button20, 
    this.button19, 
    this.button18, 
    this.button17, 
    this.button15, 
    this.button14, 
    this.button13, 
    this.button12, 
    this.button11, 
    this.button9, 
    this.button8, 
    this.button7, 
    this.button6, 
    this.button5, 
    this.button3, 
    this.button2, 
    this.textBox1}); 
    this.Name = "Form1"; 
    this.Text = "计算器"; 
    this.ResumeLayout(false); } 
    #endregion 这个接在 button18  那里....
    百度上的..
    http://zhidao.baidu.com/question/93382678.html