1int foo (int, int, int); 2int bar (int, int, int); 3 4int 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 15int foo (int x, int y, int z) 16{ 17 return (x + y + z) / 3; 18} 19 20int bar (int x, int y, int z) 21{ 22 return foo (x * x, y * y, z * z); 23} 24