实验7.2 定义一个车（vehicle）基类，使用虚函数实现动态多态性

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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:virtual void Run(){cout<<"Vehicle is running."<<endl;}virtual void Stop(){cout<<"Vehicle is stopping."<<endl;}
};
class bicycle: public vehicle
{
public:virtual void Run(){cout<<"Bicycle is running."<<endl;}virtual void Stop(){cout<<"Bicycle is stopping."<<endl;}
};
class motorcar: public vehicle
{
public:virtual void Run(){cout<<"Motorcar is running."<<endl;}virtual void Stop(){cout<<"Motorcar is stopping."<<endl;}
};
class motorcycle:public bicycle,public motorcar
{
public:virtual void Run(){cout<<"Motorcycle is running."<<endl;}virtual 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() ; return 0;
}