They used simple calculator written in C# code, entry-level

WindowsCalculator\AddOperator.cs
.................\Arithmetic.cs
.................\Backup\AddOperator.cs
.................\......\Arithmetic.cs
.................\......\CutOperator.cs
.................\......\DivideOperator.cs
.................\......\Form1.cs
.................\......\Form1.Designer.cs
.................\......\Form1.resx
.................\......\MultiplyOperator.cs
.................\......\Operator.cs
.................\......\OperatorManager.cs
.................\......\Program.cs
.................\......\...perties\AssemblyInfo.cs
.................\......\..........\Resources.Designer.cs
.................\......\..........\Resources.resx
.................\......\..........\Settings.Designer.cs
.................\......\..........\Settings.settings
.................\......\WindowsFormsApplication1.csproj
.................\......\WindowsFormsApplication1.csproj.user
.................\......\WindowsFormsApplication1.sln
.................\......\WindowsFormsApplication1.suo
.................\bin\Debug\WindowsFormsApplication1.exe
.................\...\.....\WindowsFormsApplication1.pdb
.................\...\.....\WindowsFormsApplication1.vshost.exe
.................\...\.....\WindowsFormsControlLibrary1.dll
.................\...\.....\WindowsFormsControlLibrary1.pdb
.................\countdownOperator.cs
.................\CutOperator.cs
.................\DivideOperator.cs
.................\FactorialOperator.cs
.................\Form1.cs
.................\Form1.Designer.cs
.................\Form1.resx
.................\MultiplyOperator.cs
.................\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
.................\...\.....\GenerateResource-ResGen.read.1.tlog
.................\...\.....\GenerateResource-ResGen.write.1.tlog
.................\...\.....\ResolveAssemblyReference.cache
.................\...\.....\TempPE\Properties.Resources.Designer.cs.dll
.................\...\.....\WindowsFormsApplication1.csproj.FileListAbsolute.txt
.................\...\.....\WindowsFormsApplication1.csproj.GenerateResource.Cache
.................\...\.....\WindowsFormsApplication1.exe
.................\...\.....\WindowsFormsApplication1.Form1.resources
.................\...\.....\WindowsFormsApplication1.pdb
.................\...\.....\WindowsFormsApplication1.Properties.Resources.resources
.................\Operator.cs
.................\OperatorManager.cs
.................\PowerOperate.cs
.................\Program.cs
.................\...perties\AssemblyInfo.cs
.................\..........\Resources.Designer.cs
.................\..........\Resources.resx
.................\..........\Settings.Designer.cs
.................\..........\Settings.settings
.................\SqrtOperator.cs
.................\UpgradeLog.XML
.................\WindowsFormsApplication1.csproj
.................\WindowsFormsApplication1.csproj.user
.................\WindowsFormsApplication1.sln
.................\WindowsFormsApplication1.suo
.................\_UpgradeReport_Files\UpgradeReport.css
.................\....................\UpgradeReport.xslt
.................\....................\UpgradeReport_Minus.gif
.................\....................\UpgradeReport_Plus.gif
.................\obj\Debug\TempPE
.................\Backup\Properties
.................\bin\Debug
.................\...\Release
.................\obj\Debug
.................\Backup
.................\bin
.................\obj
.................\Properties
.................\_UpgradeReport_Files
WindowsCalculator

• We are an exchange download platform that only provides communication channels. The downloaded content comes from the internet. Except for download issues, please Google on your own.
• The downloaded content is provided for members to upload. If it unintentionally infringes on your copyright, please contact us.
• Please use Winrar for decompression tools
• If download fail, Try it againg or Feedback to us.
• If downloaded content did not match the introduction, Feedback to us，Confirm and will be refund.
• Before downloading, you can inquire through the uploaded person information

Nothing．