Check if a macro has been defined : Macro Basic « Macro Preprocessor « C / ANSI-C

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Visual C++ .NET

C / ANSI-C » Macro Preprocessor » Macro Basic

Check if a macro has been defined



#include <stdio.h>



#define VAL 40;

#undef  VAL 



#define  VAL 40 



main()

{

  printf ("%d\n", VAL);

}

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2.	Macro in different file

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