950503-1.c

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

main ()
{
  int tmp;
  unsigned long long utmp1, utmp2;

  tmp = 16;

  utmp1 = (~((unsigned long long) 0)) >> tmp;
  utmp2 = (~((unsigned long long) 0)) >> 16;

  if (utmp1 != utmp2)
    abort ();
  exit (0);
}