第十三周实验报告（一）

1.1

#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;

}

 

(a) 直接用对象访问成员函数:

run a vehicle.

run a car.

run a airplane.

(b) 用指向基类的指针访问成员函数:

run a vehicle.

run a vehicle.

请按任意键继续. . .

 1.2

 

 

#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;

}

 

(a) 直接用对象访问成员函数:

run a vehicle.

run a car.

run a airplane.

(b) 用指向基类的指针访问成员函数:

run a car.

run a airplane.

请按任意键继续. . .

 

 

1.3

#include <iostream>

using namespace std;

class Vehicle

{public:

 virtual void run() const = 0; //(3) run()为纯虚函数

};

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;

 

(a) 直接用对象访问成员函数:

run a car.

run a airplane.

(b) 用指向基类的指针访问成员函数:

run a car.

run a airplane.

请按任意键继续. . .