1  int compare(x, y)
       2  unsigned int x;
       3  unsigned int y;
       4  {
       5     if (x==y)
       6       return 0;
       7     else
       8       return 1;
       9  }
      10   
      11  main()
      12  {
      13   unsigned int i, j, k, l;
      14   i = 5; j = 2; k=0; l=2;
      15   if (compare(5%(~(unsigned) 2), i%~j) 
      16       || compare(0, k%~l))
      17      abort();
      18   else
      19      exit(0);
      20  }