#include <stdio.h>struct sss{  int i1:1;  int i2:21;  int i3:31;};static union u{  struct sss sss;  unsigned char a[sizeof (struct sss)];} u;int main (void) {  int i;  for (i = 0; i < sizeof (struct sss); i++)    u.a[i] = 0;  u.sss.i1 = 1.0;  for (i = 0; i < sizeof (struct sss); i++)    printf ("%x ", u.a[i]);  printf ("\n");  u.sss.i2 = 2097151.0;  for (i = 0; i < sizeof (struct sss); i++)    printf ("%x ", u.a[i]);  printf ("\n");  u.sss.i3 = 2147483647.0;  for (i = 0; i < sizeof (struct sss); i++)    printf ("%x ", u.a[i]);  printf ("\n");  return 0;}