C语言库offsetof()函数

#include <stddef.h>
#include <stdio.h>

struct address {
   char name[50];
   char street[50];
   int phone;
};

int main () {
   printf("name offset = %d byte in address structure./n",
   offsetof(struct address, name));

   printf("street offset = %d byte in address structure./n",
   offsetof(struct address, street));

   printf("phone offset = %d byte in address structure./n",
   offsetof(struct address, phone));

   return(0);
}