第十三周实验报告一

#include <iostream> 
using namespace std;

class Vehicle 
{
public: 
	void run() const { cout << "run a vehicle. "<<endl; } //(2) run()为虚函数
}; 

class Car: public Vehicle 
{
public: 
	void run() const {cout << "run a car. "<<endl; 	} 
}; 

class Airplane: public Vehicle 
{
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();
	system("pause");
	return 0;
} 

#include <iostream> 
using namespace std;

class Vehicle 
{
public: 
	virtual void run() const { cout << "run a vehicle. "<<endl; } //(2) run()为虚函数
}; 

class Car: public Vehicle 
{
public: 
	void run() const {cout << "run a car. "<<endl; 	} 
}; 

class Airplane: public Vehicle 
{
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();
	system("pause");
	return 0;
} 

#include <iostream> 
using namespace std;

class Vehicle 
{
public: 
	virtual void run() const =0; //(2) run()为虚函数
}; 

class Car: public Vehicle 
{
public: 
	void run() const {cout << "run a car. "<<endl; 	} 
}; 

class Airplane: public Vehicle 
{
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;
	
	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();
	system("pause");
	return 0;
}