struct Perfect {
const static int crazy_bird = 2017;
void Print() { printf("crazy_bird= %d\n", crazy_bird); }
};
struct World {
Perfect perfect;
virtual void Print() { printf("crazy_bird= %d\n", perfect.crazy_bird); }
};
令Perfect* p= NULL，World* w= NULL，则p->Print() 和 w->Print()输出分别为：
