C# prepared a simple calculator, just a novice I made, some functions need perfect

jisuanqi\WinForm计算器\bin\Debug\WinForm计算器.exe
........\.............\...\.....\WinForm计算器.pdb
........\.............\...\.....\WinForm计算器.vshost.exe
........\.............\...\.....\WinForm计算器.vshost.exe.manifest
........\.............\Form1.cs
........\.............\Form1.Designer.cs
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........\.............\obj\Debug\WinForm计算器.csproj.FileListAbsolute.txt
........\.............\...\.....\WinForm计算器.csproj.GenerateResource.Cache
........\.............\...\.....\WinForm计算器.exe
........\.............\...\.....\WinForm计算器.Form1.resources
........\.............\...\.....\WinForm计算器.pdb
........\.............\...\.....\WinForm计算器.Properties.Resources.resources
........\.............\Program.cs
........\.............\...perties\AssemblyInfo.cs
........\.............\..........\Resources.Designer.cs
........\.............\..........\Resources.resx
........\.............\..........\Settings.Designer.cs
........\.............\..........\Settings.settings
........\.............\WinForm计算器.csproj
........\WinForm计算器.sln
........\.............\obj\Debug\Refactor
........\.............\...\.....\TempPE
........\.............\bin\Debug
........\.............\obj\Debug
........\.............\bin
........\.............\obj
........\.............\Properties
........\WinForm计算器
jisuanqi

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