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?Calc
{
????public?partial?class?Form1?:?Form
????{
????????//類字段變量聲明，數(shù)、數(shù)、運(yùn)算結(jié)果
????????private?double?_num1?=?0?_num2?=?0?_result?=?0;
????????//類字段：運(yùn)算符號(hào)
????????private?string?_operator?=?““;
????????//類字段：用來存儲(chǔ)運(yùn)算符號(hào)的數(shù)量
????????private?int?_operatorCount?=?0;
????????//類字段：首數(shù)字標(biāo)志位
????????private?bool?_firstNumberFlag?=?false;

????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}


????????//按鈕“0”的Click事件響應(yīng)方法
????????private?void?buttonNum0_Click（object?sender?EventArgs?e）
????????{
????????????//判斷是否為首數(shù)字。是，則替換；否，則追加
????????????if?（_firstNum

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件??????18944??2019-02-26?19:36??Calc\Calc\bin\Debug\Calc.exe

?????文件??????34304??2019-02-26?19:36??Calc\Calc\bin\Debug\Calc.pdb

?????文件??????14328??2019-03-04?10:57??Calc\Calc\bin\Debug\Calc.vshost.exe

?????文件???????1150??2019-03-03?13:05??Calc\Calc\cala.ico

?????文件???????6623??2019-03-03?13:04??Calc\Calc\cala.jpg

?????文件???????3915??2019-03-03?13:10??Calc\Calc\Calc.csproj

?????文件???????9264??2019-02-26?19:56??Calc\Calc\calc.ico.png

?????文件??????22540??2019-03-04?10:59??Calc\Calc\Form1.cs

?????文件??????20844??2019-03-04?10:59??Calc\Calc\Form1.Designer.cs

?????文件???????7846??2019-03-04?10:59??Calc\Calc\Form1.resx

?????文件????????487??2019-03-04?10:57??Calc\Calc\obj\Debug\Calc.csproj.FileListAbsolute.txt

?????文件????????847??2019-02-26?18:40??Calc\Calc\obj\Debug\Calc.csproj.GenerateResource.Cache

?????文件??????18944??2019-02-26?19:36??Calc\Calc\obj\Debug\Calc.exe

?????文件????????180??2019-02-26?18:40??Calc\Calc\obj\Debug\Calc.Form1.resources

?????文件??????34304??2019-02-26?19:36??Calc\Calc\obj\Debug\Calc.pdb

?????文件????????180??2019-02-25?19:23??Calc\Calc\obj\Debug\Calc.Properties.Resources.resources

?????文件????????511??2019-02-25?19:23??Calc\Calc\Program.cs

?????文件???????1420??2019-02-25?18:59??Calc\Calc\Properties\AssemblyInfo.cs

?????文件???????2837??2019-02-25?18:59??Calc\Calc\Properties\Resources.Designer.cs

?????文件???????5612??2019-02-25?18:59??Calc\Calc\Properties\Resources.resx

?????文件???????1089??2019-02-25?18:59??Calc\Calc\Properties\Settings.Designer.cs

?????文件????????249??2019-02-25?18:59??Calc\Calc\Properties\Settings.settings

?????文件????????902??2019-02-25?18:59??Calc\Calc.sln

????..A..H.?????15360??2019-03-04?11:00??Calc\Calc.suo

?????目錄??????????0??2019-02-26?14:13??Calc\Calc\obj\Debug\Refactor

?????目錄??????????0??2019-02-25?18:59??Calc\Calc\obj\Debug\TempPE

?????目錄??????????0??2019-02-26?19:58??Calc\Calc\bin\Debug

?????目錄??????????0??2019-02-26?19:36??Calc\Calc\obj\Debug

?????目錄??????????0??2019-02-25?18:59??Calc\Calc\bin

?????目錄??????????0??2019-02-25?18:59??Calc\Calc\obj

............此處省略6個(gè)文件信息