1  unsigned long
       2  sub (int a)
       3  {
       4    return ((0 > a - 2) ? 0 : a - 2) * sizeof (long);
       5  }
       6  
       7  main ()
       8  {
       9    if (sub (0) != 0)
      10      abort ();
      11  
      12    exit (0);
      13  }