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