1  int foo (int, int, int);
       2  int bar (int, int, int);
       3  
       4  int main (void)
       5  {
       6    if (foo (5, 10, 21) != 12)
       7      abort ();
       8  
       9    if (bar (9, 12, 15) != 150)
      10      abort ();
      11  
      12    exit (0);
      13  }
      14  
      15  int foo (int x, int y, int z)
      16  {
      17    return (x + y + z) / 3;
      18  }
      19  
      20  int bar (int x, int y, int z)
      21  {
      22    return foo (x * x, y * y, z * z);
      23  }