运行下列程序结果为_________________。 #include
class one { public: virtual void f(){cout<<"1";} }; class two:public one { public: two(){cout<<"2";} }; class three:public two { public: virtual void f(){two::f();cout<<"3"; } }; int main() { one aa,*p; two bb; three cc; p=&cc; p->f(); return 0; }