1 extern void abort (void); 2 f(unsigned int x,int n)3 int f(unsigned int x, int n) 4 { 5 return ((int)x) / (1 << n); 6 } 7 main()8 int main() 9 { 10 if (f(-1, 1) != 0) 11 abort (); 12 return 0; 13 } 14