#include <stdio.h>

struct chars {char a; char b; char c; char d; };
main()
{  int x;
   char * c1;
   struct chars * c2;

   x = 0x01234567;

   c1 = (char *)&x;

   printf("%x %x %x %x\n",c1[0],c1[1],c1[2],c1[3]);

   c2 = (struct chars *)&x;

   printf("%x %x %x %x\n",c2->a,c2->b,c2->c,c2->d);

}