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@ririn_yume

null

Posted at 

#include <stdio.h>
#include <stdlib.h>

#define nullnull ((void*)0)
#define nullconst (0)

int main(int argc, char** argv)
{
  int x = nullnull; /* 警告 */
  int y = nullconst;

  if(x == y) puts("same");

  return 0;
}
/*
  GNU C++(__GNUG__)の場合 … __null
  GNU C++でなく、Cの場合 … ((void *)0)
  GNU C++でなく、C++の場合 … 0
*/
0

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