1 extern void abort (void); foo(int i)2 int foo (int i) 3 { 4 return -2 * __builtin_abs(i - 2); 5 } main()6 int main() 7 { 8 if (foo(1) != -2 9 || foo(3) != -2) 10 abort (); 11 return 0; 12 } 13