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

1. C / ANSI-C
2. Macro Preprocessor
3. 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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