函数的联系

#include <iostream>using namespace std;class B{public:void f() {cout<<"bf";}virtual void vf() {cout<<"vbf";}void ff() {vf(); f();};virtual void vff() {vf();f();}};class D:public B{public:void f() {cout<<"df";}void ff() {f();vf();}void vf() {cout<<"dvf";}};void main(){D d;B *pB=&d;pB->f();pB->ff();pB->vf();pB->vff();}