1  unsigned int
       2  f1 (int diff)
       3  {
       4    return ((unsigned int) (diff < 0 ? -diff : diff));
       5  }
       6  
       7  unsigned int
       8  f2 (unsigned int diff)
       9  {
      10    return ((unsigned int) ((signed int) diff < 0 ? -diff : diff));
      11  }
      12  
      13  unsigned long long
      14  f3 (long long diff)
      15  {
      16    return ((unsigned long long) (diff < 0 ? -diff : diff));
      17  }
      18  
      19  unsigned long long
      20  f4 (unsigned long long diff)
      21  {
      22    return ((unsigned long long) ((signed long long) diff < 0 ? -diff : diff));
      23  }
      24  
      25  main ()
      26  {
      27    int i;
      28    for (i = 0; i <= 10; i++)
      29      {
      30        if (f1 (i) != i)
      31  	abort ();
      32        if (f1 (-i) != i)
      33  	abort ();
      34        if (f2 (i) != i)
      35  	abort ();
      36        if (f2 (-i) != i)
      37  	abort ();
      38        if (f3 ((long long) i) != i)
      39  	abort ();
      40        if (f3 ((long long) -i) != i)
      41  	abort ();
      42        if (f4 ((long long) i) != i)
      43  	abort ();
      44        if (f4 ((long long) -i) != i)
      45  	abort ();
      46      }
      47    exit (0);
      48  }