foo(int i)1 int foo(int i) 2 { 3 if (((unsigned)(i + 1)) * 4 == 0) 4 return 1; 5 return 0; 6 } 7 8 extern void abort(void); main()9 int main() 10 { 11 if (foo(0x3fffffff) == 0) 12 abort (); 13 return 0; 14 } 15