xuhanshu.cpp

vc++虚函数实验

#include<iostream.h>

class car{

public:
	float distance;
    car(float x)
	{
		distance=x;
	}
    virtual travel_time()
	{
    	float t;
    	t=distance/80;
    	cout<<"The time is "<<t<<endl;
	}
};
class kilometre:public car
{
public:
	kilometre(float y):car(y)
	{;}
    virtual travel_time()
	{
		float t;
		t=distance/120;
		cout<<"2The time is "<<t<<endl;
	}
};

main()
{
    float ch=0;
	cout<<"please input :"<<endl;
	cin>>ch;
	car p(ch),*q;
	kilometre m(ch);
	q=&p;
	q->travel_time();
	q=&m;
    q->travel_time();
	return 0;
}