Realize calculator main class, the entrance is a string class variable representing mathematical expressions. Output a double variable.

MyCASIO
.......\MyCASIO
.......\MyCASIO.sln
.......\MyCASIO.suo
.......\.......\bin
.......\.......\...\Debug
.......\.......\...\.....\MyCASIO.exe
.......\.......\...\.....\MyCASIO.pdb
.......\.......\...\.....\MyCASIO.vshost.exe
.......\.......\...\.....\MyCASIO.vshost.exe.manifest
.......\.......\Calculator.cs
.......\.......\ClassDiagram1.cd
.......\.......\Form1.cs
.......\.......\Form1.Designer.cs
.......\.......\Form1.resx
.......\.......\Form2.cs
.......\.......\Form2.Designer.cs
.......\.......\Form2.resx
.......\.......\MyCASIO.csproj
.......\.......\obj
.......\.......\...\x86
.......\.......\...\...\Debug
.......\.......\...\...\.....\DesignTimeResolveAssemblyReferences.cache
.......\.......\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
.......\.......\...\...\.....\GenerateResource.read.1.tlog
.......\.......\...\...\.....\GenerateResource.write.1.tlog
.......\.......\...\...\.....\MyCASIO.csproj.FileListAbsolute.txt
.......\.......\...\...\.....\MyCASIO.exe
.......\.......\...\...\.....\MyCASIO.Form1.resources
.......\.......\...\...\.....\MyCASIO.Form2.resources
.......\.......\...\...\.....\MyCASIO.pdb
.......\.......\...\...\.....\MyCASIO.Properties.Resources.resources
.......\.......\...\...\.....\TempPE
.......\.......\Program.cs
.......\.......\Properties
.......\.......\..........\AssemblyInfo.cs
.......\.......\..........\Resources.Designer.cs
.......\.......\..........\Resources.resx
.......\.......\..........\Settings.Designer.cs
.......\.......\..........\Settings.settings
.......\.......\unary.cs

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