ifdef preprocessor : Preprocessor IF « Macro Preprocessor « C / ANSI-C

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C / ANSI-C » Macro Preprocessor » Preprocessor IF

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ifdef preprocessor



#include <stdio.h>



#define DOG



int main(void)

{

#ifdef DOG

  printf("DOG is defined.\n");

#endif



#undef DOG



#ifdef DOG

  printf("This line is not compiled.\n");

#endif



  return 0;

}

Related examples in the same category

1.	#IF #ELSE #ENDIF
2.	IF and endif preprocessor

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