this is a gcc file, you can download it and learn its usetility, for further detail please look at t

源代码在线查看: s-char-s-pointer.c

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相关代码

				#include 								static struct sss{				  char f;				  struct {char * m;} snd;				} sss;								#define _offsetof(st,f) ((char *)&((st *) 16)->f - (char *) 16)								int main (void) {				  printf ("+++Struct pointer inside struct starting with char:\n");				  printf ("size=%d,align=%d\n", sizeof (sss), __alignof__ (sss));				  printf ("offset-char=%d,offset-sss-pointer=%d,\nalign-char=%d,align-sss-pointer=%d\n",				          _offsetof (struct sss, f), _offsetof (struct sss, snd),				          __alignof__ (sss.f), __alignof__ (sss.snd));				  return 0;				}							

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