标准四则计算器（C#编写）

G:\calc\calc\obj\Debug\calc.exe G:\calc\calc\obj\Debug\calc.pdb G:\calc\calc\bin\Debug\calc.exe G:\calc\calc\bin\Debug\calc.pdb G:\calc\calc\obj\Debug\ResolveAssemblyReference.cache G:\calc\calc\obj\Debug\calc.About.resources G:\calc\calc\obj\Debug\calc.Form1.resources G:\calc\calc\obj\Debug\calc.Properties.Resources.resources G:\calc\calc\obj\Debug\calc.csproj.GenerateResource.Cache F:\Lenovo\calc\calc\obj\Debug\calc.exe F:\Lenovo\calc\calc\obj\Debug\calc.pdb F:\Lenovo\calc\calc\bin\Debug\calc.exe F:\Lenovo\calc\calc\bin\Debug\calc.pdb F:\Lenovo\calc\calc\obj\Debug\ResolveAssemblyReference.cache F:\Lenovo\calc\calc\obj\Debug\calc.About.resources F:\Lenovo\calc\calc\obj\Debug\calc.Form1.resources F:\Lenovo\calc\calc\obj\Debug\calc.Properties.Resources.resources F:\Lenovo\calc\calc\obj\Debug\calc.csproj.GenerateResource.Cache