C++ Fatal Error LNK1120: 1 unresolved externals

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From msdn

When you created the project, you made the wrong choice of application
type. When asked whether your project was a console application or a
windows application or a DLL or a static library, you made the wrong
chose windows application (wrong choice).

Go back, start over again, go to File -> New -> Project -> Win32
Console Application -> name your app -> click next -> click
application settings.

For the application type, make sure Console Application is selected
(this step is the vital step).

The main for a windows application is called WinMain, for a DLL is
called DllMain, for a .NET application is called
Main(cli::array ^), and a static library doesn’t have a
main. Only in a console app is main called main

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