animalclasspolymorphism.cpp

来自「C++ sample code, for the book: C++ blac」· C++ 代码 · 共 39 行

#include <iostream>
using namespace std;

class animal 
{                     
public:
    void eat();
    void sleep();
    //virtual void breathe(); 
    void breathe(); 
};

class fish : public animal 
{
public:
    void breathe();
};

void animal::breathe(){cout << "Breathing..." << endl;}
void animal::eat(){cout << "Eating..." << endl;}
void animal::sleep(){cout << "Sleeping..." << endl;}
void fish::breathe(){cout << "Bubbling..." << endl;}

int main()
{
    animal animal_object;
    fish the_fish;
    animal *obj_ptr;

    obj_ptr = &animal_object;  

    obj_ptr->breathe();

    obj_ptr = &the_fish;

    obj_ptr->breathe();

    return 0;
}