c# Realize calculator program can achieve the basic functions of addition, subtraction, etc.

计算器实例程序
..............\App.ico
..............\AssemblyInfo.cs
..............\BIN
..............\...\Debug
..............\...\.....\Calculator.exe
..............\...\.....\Calculator.pdb
..............\...\.....\Calculator.vshost.exe
..............\...\.....\Calculator.vshost.exe.manifest
..............\...\Release
..............\CALC.CS
..............\calc.resx
..............\Calculator.csproj
..............\Calculator.csproj.user
..............\Calculator.sln
..............\Calculator.suo
..............\OBJ
..............\...\Calculator.csproj.FileList.txt
..............\...\Calculator.csproj.FileListAbsolute.txt
..............\...\Debug
..............\...\.....\Calculator.csproj.FileListAbsolute.txt
..............\...\.....\Calculator.csproj.GenerateResource.Cache
..............\...\.....\Calculator.exe
..............\...\.....\Calculator.exe.incr
..............\...\.....\Calculator.Form1.resources
..............\...\.....\Calculator.pdb
..............\...\.....\Calculator.projdata
..............\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..............\...\.....\GenerateResource-ResGen.read.1.tlog
..............\...\.....\GenerateResource-ResGen.write.1.tlog
..............\...\.....\TEMP
..............\...\.....\TempPE
..............\...\.....\win.resources
..............\UpgradeLog.XML
..............\UpgradeLog2.XML
..............\_UpgradeReport_Files
..............\....................\UpgradeReport.css
..............\....................\UpgradeReport.xslt
..............\....................\UpgradeReport_Minus.gif
..............\....................\UpgradeReport_Plus.gif

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