#include＜iostream.h＞
class A
{public:
virtual～A 1{}
virtual void f 2
{cout＜＜"A::f 3"＜＜endl;}
virtual void g 4
{cout＜＜"A::g 5"＜＜endl;}
};
class B:public A
{public:
virtual void g 6
{cout＜＜"B::g 7"＜＜endl;}
virtual void k 8
{cout＜＜"B::k 9"＜＜endl;}
};
void main 10
{A*p=new B;
p-＞f 11;
p-＞g 12;
p-＞k 13;
delete p;
}