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;
}
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