毒株的灭亡

#include <iostream>

using namespace std;

class Virus {

public:

Virus() {

cout << "I am the ancestor of the new virus!" << endl;

}

~Virus() {

cout << "I must disappear!" << endl;

}

virtual void eat()=0; //定义纯虚函数

};

class vOne : public Virus

{

public:

vOne() {

cout << "vOne is born." << endl;

}

~vOne() {

cout << "vOne is dead." << endl;

}

void eat() {

cout << "vOne is living in your body." << endl;

}

};

class vTwo : public Virus

{

public:

vTwo() {

cout << "vTwo is born." << endl;

}

~vTwo() {

cout << "vTwo is dead." << endl;

}

void eat() {

cout << "vTwo is living in your body." << endl;

}

};

int main() {

Virus *v; //定义父类指针v

vOne v1; //定义vOne对象v1

vTwo v2; //定义vTwo对象v2

v = &v1;

v->eat(); //通过父类指针调用eat()方法

v = &v2;

v->eat(); //通过父类指针调用eat()方法

cout << "Our immune system is kill v1 and v2..." << endl;

return 0;

}