Description: 4 can be computing, but there is little input problems, not be negative
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计算器
......\计算器
......\......\bin
......\......\...\Debug
......\......\...\.....\计算器.exe
......\......\...\.....\计算器.pdb
......\......\...\.....\计算器.vshost.exe
......\......\...\.....\计算器.vshost.exe.manifest
......\......\Form1.cs
......\......\Form1.Designer.cs
......\......\Form1.resx
......\......\obj
......\......\...\Debug
......\......\...\.....\Refactor
......\......\...\.....\TempPE
......\......\...\.....\计算器.calcForm.resources
......\......\...\.....\计算器.csproj.FileListAbsolute.txt
......\......\...\.....\计算器.csproj.GenerateResource.Cache
......\......\...\.....\计算器.exe
......\......\...\.....\计算器.pdb
......\......\...\.....\计算器.Properties.Resources.resources
......\......\Program.cs
......\......\Properties
......\......\..........\AssemblyInfo.cs
......\......\..........\Resources.Designer.cs
......\......\..........\Resources.resx
......\......\..........\Settings.Designer.cs
......\......\..........\Settings.settings
......\......\计算器.csproj
......\计算器.sln