using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Linq;
using?System.Text;
using?System.Windows.Forms;

namespace?Calculator
{
????public?partial?class?Form1?:?Form
????{
????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}

????????#region?數字按鈕事件（所有的數字一個事件）
????????///?

????????///?數字按鈕事件（所有的數字一個事件）
????????///?

????????///?
????????///?
????????private?void?btnNum_Click（object?sender?EventArgs?e）
????????{
????????????//用戶輸入數字
????????????string?btnText?=?（sender?as?Button）.Text;
????????????//如果用戶重復點擊0?不做任何操作
????????????if?（（this.labNum.Text.Replace（“-“?““）?==?“0“?&&?btnText?==?“0“））?{?return;?}
????????????//如果用戶重復點擊小數點?不做任何操作
????????????if?（this.labNum.Text.IndexOf（“.“）?>=?0?&&?btnText?==?“.“）?{?return;?}
????????????//判斷步驟
????????????switch?（this.labNum.Tag.ToString（））
????????????{
????????????????//如果是第一步驟（0代表第一步用戶沒有按下任何符號）
????????????????case?“0“:
????????????????????break;
????????????????//如果是第二步驟用戶已經按下了運算符
????????????????case?“1“:
????????????????????//如果用戶按下小數點將數字改為0.
????????????????????if?（btnText?==?“.“）
????????????????????????this.labNum.Text?=?“0.“;
????????????????????//否則將顯示框變為用戶輸入的數字
????????????????????else?
????????????????????????this.labNum.Text?=?btnText;
????????????????????//步驟變為第一步.允許用戶輸入
????????????????????this.labNum.Tag?=?“0“;
????????????????????return;
????????????????default:
????????????????????break;
????????????}
????????????//如果顯示框為0并且用戶不是重復輸入0
????????????if?（this.labNum.Text?==?“0“?&&?btnText?!=?“0“）
????????????{
????????????????//如果用戶輸入的不是是小數點清除的0將用戶輸入的數字加進去（數字前面的0會被省略掉）
????????????????if?（btnText?!=?“.“）
????????????????????this.labNum.Text?=?btnText;
????????????????else
????????????????????//將小數點加在0后面
????????????????????this.labNum.Text?+=?btnText;
????????????}
????????????//如果顯示框不是0?將用戶輸入的數字加載顯示框末尾
????????????else?{?
????????????????if（this.labNum.Text.Length<=17）
????????????????????this.labNum.Text?+=?btnText;
????????????}
????????}
????????#endregion

????????#region?用戶點擊按鈕
????????///?

????????///?用戶點擊按鈕
????????///?

????????///?
????????///?
????????private?void?ComBut_Click（object?sender?EventArgs?e）
????????{
????????????//得到用戶點擊的算法
????????????string?comText?=?（sender?as?Button）.Text;
????????????//如果用戶更換運算符
????????????if?（this.labNum.Tag.ToString（）?==?“1“?&&?this.labCom.Text?!=?““）
????????????{

????????????????//更換最后一位運算符
????????????????this.labCom.Text?=?this.labCom.Text.Substring（0?this.labCom.Text.Length?-?1）?+?comText;
????????????????//跳出
????????????????return;
????????????}
????????????//如果算式為空
????????????if?（this.labCom.Text?==?““）
????????????{
????????????????//加上當前算式
????????????????this.labCom.Text?=?labNum.Text?+?comTe

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????24576??2011-10-21?17:03??Calculator\Calculator\Calculator\bin\Debug\Calculator.exe

?????文件??????34304??2011-10-21?17:03??Calculator\Calculator\Calculator\bin\Debug\Calculator.pdb

?????文件??????11600??2011-10-21?17:02??Calculator\Calculator\Calculator\bin\Debug\Calculator.vshost.exe

?????文件????????490??2010-03-17?22:39??Calculator\Calculator\Calculator\bin\Debug\Calculator.vshost.exe.manifest

?????文件???????3791??2011-10-21?15:14??Calculator\Calculator\Calculator\Calculator.csproj

?????文件??????20245??2011-10-21?17:03??Calculator\Calculator\Calculator\Form1.cs

?????文件??????30461??2011-10-21?16:11??Calculator\Calculator\Calculator\Form1.Designer.cs

?????文件???????6015??2011-10-21?16:11??Calculator\Calculator\Calculator\Form1.resx

?????文件???????1619??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug\Calculator.csproj.FileListAbsolute.txt

?????文件??????24576??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug\Calculator.exe

?????文件????????180??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug\Calculator.Form1.resources

?????文件??????34304??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug\Calculator.pdb

?????文件???????2202??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug\Calculator.Properties.Resources.resources

?????文件???????2152??2011-10-20?21:07??Calculator\Calculator\Calculator\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache

?????文件???????6318??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

?????文件????????706??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug\GenerateResource.read.1.tlog

?????文件????????606??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug\GenerateResource.write.1.tlog

?????文件???????4608??2011-10-20?21:22??Calculator\Calculator\Calculator\obj\x86\Debug\TempPE\Properties.Resources.Designer.cs.dll

?????文件????????491??2011-10-20?21:07??Calculator\Calculator\Calculator\Program.cs

?????文件???????1352??2011-10-20?21:07??Calculator\Calculator\Calculator\Properties\AssemblyInfo.cs

?????文件???????3107??2011-10-20?21:22??Calculator\Calculator\Calculator\Properties\Resources.Designer.cs

?????文件???????6197??2011-10-20?21:22??Calculator\Calculator\Calculator\Properties\Resources.resx

?????文件???????1095??2011-10-20?21:07??Calculator\Calculator\Calculator\Properties\Settings.Designer.cs

?????文件????????249??2011-10-20?21:07??Calculator\Calculator\Calculator\Properties\Settings.settings

?????文件???????1732??2011-10-20?21:21??Calculator\Calculator\Calculator\Resources\txtBj.jpg

?????文件????????872??2011-10-20?21:07??Calculator\Calculator\Calculator.sln

????..A..H.?????20992??2011-10-21?14:28??Calculator\Calculator\Calculator.suo

?????目錄??????????0??2011-10-20?22:56??Calculator\Calculator\Calculator\obj\x86\Debug\TempPE

?????目錄??????????0??2011-10-21?17:03??Calculator\Calculator\Calculator\obj\x86\Debug

?????目錄??????????0??2011-10-21?17:03??Calculator\Calculator\Calculator\bin\Debug

............此處省略11個文件信息