This is with VC to prepare a code on the calculator, it can be downloaded for reference, there are four computing

ProgramCalculator
.................\ProgramCalculator
.................\.................\bin
.................\.................\...\Debug
.................\.................\CompilerUnit.cs
.................\.................\FancyText.cs
.................\.................\Form1.cs
.................\.................\Form1.Designer.cs
.................\.................\Form1.resx
.................\.................\FormAbout.cs
.................\.................\FormAbout.Designer.cs
.................\.................\FormAbout.resx
.................\.................\FormAddFunctionGuide.cs
.................\.................\FormAddFunctionGuide.Designer.cs
.................\.................\FormAddFunctionGuide.resx
.................\.................\FormAddUsing.cs
.................\.................\FormAddUsing.Designer.cs
.................\.................\FormAddUsing.resx
.................\.................\FormFunctionCoding.cs
.................\.................\FormFunctionCoding.Designer.cs
.................\.................\FormFunctionCoding.resx
.................\.................\Function.cs
.................\.................\FunctionInfo.cs
.................\.................\FunctionInfoCollection.cs
.................\.................\Globals.cs
.................\.................\obj
.................\.................\...\Debug
.................\.................\...\ProgramCalculator.csproj.FileList.txt
.................\.................\PanelLayoutButtons.cs
.................\.................\Program.cs
.................\.................\ProgramCalculator.csproj
.................\.................\Properties
.................\.................\..........\AssemblyInfo.cs
.................\.................\..........\Resources.Designer.cs
.................\.................\..........\Resources.resx
.................\.................\..........\Settings.Designer.cs
.................\.................\..........\Settings.settings
.................\.................\TranslateUnit.cs
.................\ProgramCalculator.sln

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