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

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

????????double?num1?num2?result;
????????string?str?opp1?opp2;
????????bool?eq_flag=false?opp_flag=false;
????????private?void?btnSign_Click（object?sender?EventArgs?e）
????????{
????????????str?=?txtXs.Text;
????????????int?index?=?str.IndexOf（“-“）;
????????????if?（index?==?-1）
????????????{
????????????????str?=?str.Insert（0?“-“）;
????????????????txtXs.Text?=?str;
????????????}
????????????else
????????????{
????????????????str?=?str.Substring（1）;
????????????????txtXs.Text?=?str;
????????????}
????????}//z正負號

????????private?void?Number（object?sender?EventArgs?e）
????????{
????????????Button?b?=?（Button）（sender）;
????????????str?=?b.Text;
????????????if?（txtXs.Text?==?“0“）
????????????{
????????????????txtXs.Text?=?str;
????????????}
????????????else
????????????{
????????????????txtXs.Text?=?txtXs.Text?+?str;
????????????}
????????}//輸入數字事件

????????private?void?Operator1（object?sender?EventArgs?e）//運算事件
????????{
????????????Button?b?=?（Button）sender;

????????????if?（b.Text?!=?“=“）
????????????{
????????????????num1?=?double.Parse（txtXs.Text）;
????????????????opp1?=?b.Text;
????????????????opp2?=?““;
????????????????txtXs.Text?=?“0“;
????????????????opp_flag?=?true;
????????????}
????????????else?if?（!opp_flag）
????????????{
????????????????return;
????????????}
????????????else?if（opp_flag）
????????????{
????????????????if（opp2?!=?“=“）
????????????????{
????????????????????num2?=?double.Parse（txtXs.Text）;
????????????????}
????????????????switch（opp1）
????????????????{
????????????????????case?“+“:
????????????????????????num1?=?num1+?num2;
????????????????????????break;

????????????????????case?“-“:
????????????????????????num1?=?num1?-?num2;
????????????????????????break;

????????????????????case?“*“:
????????????????????????num1?=?num1?*?num2;
????????????????????????break;

????????????????????case?“/“:
????????????????????????if?（num2?==?0）?txtXs.Text?=?“除數不能為0“;
????????????????????????else?num1?=?num1?/?num2;
????????????????????????break;
????????????????}
????????????????txtXs.Text?=?num1.ToString（）;
????????????????opp2?=?“=“;
????????????}
????????}
????????private?void?Operator2（object?sender?EventArgs?e）
????????{
????????????Button?b?=?（Button）（sender）;
????????????if?（b.Text?==?“.“）
????????????{
????????????????str?=?txtXs.Text;
????????????????int?index?=?str.IndexOf（“.“）;
????????????????if?（index?==?-1）
????????????????{
????????????????????txtXs.Text?=?str?+?“.“;
????????????????}
????????????}
????????????else?if?（b.Text?==?“←“）
????????????{

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

????..A..H.?????37376??2019-03-21?22:38??WCalculator\.vs\WCalculator\v15\.suo

?????文件??????????0??2019-03-20?10:22??WCalculator\.vs\WCalculator\v15\Server\sqlite3\db.lock

?????文件?????585728??2019-03-20?19:24??WCalculator\.vs\WCalculator\v15\Server\sqlite3\storage.ide

?????文件??????32768??2019-03-21?19:29??WCalculator\.vs\WCalculator\v15\Server\sqlite3\storage.ide-shm

?????文件????4120032??2019-03-20?19:58??WCalculator\.vs\WCalculator\v15\Server\sqlite3\storage.ide-wal

?????文件????????189??2019-03-20?10:22??WCalculator\WCalculator\App.config

?????文件??????16896??2019-03-20?19:58??WCalculator\WCalculator\bin\Debug\WCalculator.exe

?????文件????????189??2019-03-20?10:22??WCalculator\WCalculator\bin\Debug\WCalculator.exe.config

?????文件??????34304??2019-03-20?19:58??WCalculator\WCalculator\bin\Debug\WCalculator.pdb

?????文件???????4357??2019-03-20?19:59??WCalculator\WCalculator\Form1.cs

?????文件???????4284??2019-03-20?19:24??WCalculator\WCalculator\Form1.cs~RF25a90e5.TMP

?????文件??????22692??2019-03-20?11:15??WCalculator\WCalculator\Form1.Designer.cs

?????文件???????6015??2019-03-20?11:12??WCalculator\WCalculator\Form1.resx

?????文件????????831??2019-03-20?10:22??WCalculator\WCalculator\obj\Debug\DesignTimeResolveAssemblyReferences.cache

?????文件???????7248??2019-03-20?10:22??WCalculator\WCalculator\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache

?????文件??????????0??2019-03-20?10:22??WCalculator\WCalculator\obj\Debug\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs

?????文件??????????0??2019-03-20?10:22??WCalculator\WCalculator\obj\Debug\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs

?????文件??????????0??2019-03-20?10:22??WCalculator\WCalculator\obj\Debug\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs

?????文件?????????42??2019-03-20?10:22??WCalculator\WCalculator\obj\Debug\WCalculator.csproj.CoreCompileInputs.cache

?????文件???????1025??2019-03-20?11:19??WCalculator\WCalculator\obj\Debug\WCalculator.csproj.FileListAbsolute.txt

?????文件???????1012??2019-03-20?11:12??WCalculator\WCalculator\obj\Debug\WCalculator.csproj.GenerateResource.cache

?????文件??????11490??2019-03-20?10:22??WCalculator\WCalculator\obj\Debug\WCalculator.csprojAssemblyReference.cache

?????文件??????16896??2019-03-20?19:58??WCalculator\WCalculator\obj\Debug\WCalculator.exe

?????文件????????180??2019-03-20?11:12??WCalculator\WCalculator\obj\Debug\WCalculator.Form1.resources

?????文件??????34304??2019-03-20?19:58??WCalculator\WCalculator\obj\Debug\WCalculator.pdb

?????文件????????180??2019-03-20?10:38??WCalculator\WCalculator\obj\Debug\WCalculator.Properties.Resources.resources

?????文件????????523??2019-03-20?10:22??WCalculator\WCalculator\Program.cs

?????文件???????1320??2019-03-20?10:22??WCalculator\WCalculator\Properties\AssemblyInfo.cs

?????文件???????2835??2019-03-20?10:22??WCalculator\WCalculator\Properties\Resources.Designer.cs

?????文件???????5612??2019-02-03?20:39??WCalculator\WCalculator\Properties\Resources.resx

............此處省略20個文件信息