960116-1.c

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

static inline
p (int *p)
{
  return !((long) p & 1);
}

int
f (int *q)
{
  if (p (q) && *q)
    return 1;
  return 0;
}

main ()
{
  if (f ((int*) 0xffffffff) != 0)
    abort ();
  exit (0);
}