Make their own calculator, function is more general. 4 can be general computing, will be zero divisor error. But not more than two consecutive operations.

200530670104 崔银江 计算器
..........................\200530670104 崔银江 计算器.doc
..........................\WindowsApplication10
..........................\....................\bin
..........................\....................\...\Debug
..........................\....................\Form1.cs
..........................\....................\Form1.Designer.cs
..........................\....................\Form1.resx
..........................\....................\obj
..........................\....................\...\Debug
..........................\....................\...\WindowsApplication10.csproj.FileList.txt
..........................\....................\Program.cs
..........................\....................\Properties
..........................\....................\..........\AssemblyInfo.cs
..........................\....................\..........\Resources.Designer.cs
..........................\....................\..........\Resources.resx
..........................\....................\..........\Settings.Designer.cs
..........................\....................\..........\Settings.settings
..........................\....................\WindowsApplication10.csproj
..........................\....................\WindowsApplication10.csproj.user
..........................\WindowsApplication10.sln

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