1  void foo (unsigned int n)
       2  {
       3    int i, j = -1;
       4  
       5    for (i = 0; i < 10 && j < 0; i++)
       6      {
       7        if ((1UL << i) == n)
       8  	j = i;
       9      }
      10  
      11    if (j < 0)
      12      abort ();
      13  }
      14  
      15  main()
      16  {
      17    foo (64);
      18    exit (0);
      19  }