1  f (int b, int c)
       2  {
       3    if (b != 0 && b != 1 && c != 0)
       4      b = 0;
       5    return b;
       6  }
       7  
       8  main ()
       9  {
      10    if (!f (1, 2))
      11      abort();
      12    exit(0);
      13  }