Compiler Error C2019

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The latest version of this topic can be found at Compiler Error C2019.

expected preprocessor directive, found 'character'

The character followed a # sign but it is not the first letter of a preprocessor directive.

The following sample generates C2019:

// C2019.cpp  
#!define TRUE 1   // C2019  

Possible resolution:

// C2019b.cpp  
// compile with: /c  
#define TRUE 1