实验7.2 定义一个车（vehicle）基类，使用虚函数实现动态多态性

题目

定义一个车（vehicle）基类，有Run、Stop等成员函数，由此派生出自行车（bicycle）类、汽车（motorcar）类，从bicycle和motorcar派生出摩托车（motorcycle）类，它们都有Run、Stop等成员函数。观察虚函数的作用。

C++代码如下：

#include<iostream>
using namespace std;

class vehicle
{
public:
	 void Run(){cout<<"Vehicle is running."<<endl;}
	 void Stop(){cout<<"Vehicle is stopping."<<endl;}
};
class bicycle: public vehicle
{
public:
	void Run(){cout<<"Bicycle is running."<<endl;}
	void Stop(){cout<<"Bicycle is stopping."<<endl;}
};
class motorcar: public vehicle
{
public:
	void Run(){cout<<"Motorcar is running."<<endl;}
	void Stop(){cout<<"Motorcar is stopping."<<endl;}
};
class motorcycle:public bicycle,public motorcar
{
public:
	void Run(){cout<<"Motorcycle is running."<<endl;}
	void Stop(){cout<<"Motorcycle is stopping."<<endl;}
};
int main()
{
	vehicle v;
	bicycle b;
	motorcar mcar;
	motorcycle mcycle;
	
	v.Run();
	v.Stop();
	b.Run();
	b.Stop();
	mcar.Run();
	mcar.Stop();
	mcycle.Run();
	mcycle.Stop(); 
	
	cout<<"指针调用"<<endl;
	vehicle* p;
	p=&v;
	p->Run() ;
	p->Stop() ; 
	p=&b;
	p->Run() ;
	p->Stop() ; 
	p=&mcar;
	p->Run() ;
	p->Stop() ; 
//	p=&mcycle;
//	p->Run() ;
//	p->Stop() ; 
	
	return 0;
}