自考新教材-p262

多态与非多态的比较

源程序：

#include <iostream>

using namespace std;

class A{

public:

void func1(){

cout<<"A::func1"<<endl;

}

virtual void func2(){

cout<<"A::func2"<<endl;

}

};

class B:public A{

public:

virtual void func1(){

cout<<"B::func1"<<endl;

}

void func2(){

cout<<"B::func2"<<endl;

}

};

class C:public B{

public:

void func1(){

cout<<"C::func1"<<endl;

}

void func2(){

cout<<"C::func2"<<endl;

}

};

int main(){

C obj;

A *pa = &obj;

B *pb = &obj;

pa->func2();

pa->func1();

pb->func1();

return 0;

}

运行结果：