20000314-2.c

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

typedef unsigned long long uint64;
const uint64 bigconst = 1ULL << 34;

int a = 1;

static
uint64 getmask(void)
{
    if (a)
      return bigconst;
    else
      return 0;
}

main()
{
    uint64 f = getmask();
    if (sizeof (long long) == 8
	&& f != bigconst) abort ();
    exit (0);
}