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

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

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;
}


           
       

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