第十四周

#include <iostream>using namespace std;class Vehicle //交通工具{public:    void run() const    {        cout<<"run a vehicle"<<endl;   }};class Car:public Vehicle//汽车{public:    void run() const    {        cout<<"run a car."<<endl;    }};class Airplane:public Vehicle//飞机{public:    void run() const    {          cout<<"run a airplane."<<endl;    }};int main(){   cout<<"(a) 直接用对象访问成员函数："<<endl;     Vehicle v;   v.run();   Car car;   Airplane airplane;  car.run();  airplane.run();  cout<<"(b) 用指向基类的指针访问成员函数："<<endl;   Vehicle *vp;   vp=&car;  vp->run();   vp=&airplane;   vp->run();   return 0;}

运行结果