小编Jac*_*ack的帖子

我有这个代码示例,我想了解它为什么会这样做.这是一篇介绍C++课程中过去的试卷的问题.我现在正在为考试而学习,并试图巩固我对班级继承的理解.

#include <iostream>
using namespace std;

class Bird {
  public:
    virtual void noise() { cout << "mumble" << endl; }
    void move() { noise(); cout << "fly" << endl; }
};

class Canary: public Bird {
  public:
    void noise() { cout << "chirp" << endl; }
    void move() { noise(); cout << "flap" << endl; }
};

class Tweety: public Canary {
  public:
    void noise() { cout << "tweet" << endl; }
    void move() { noise(); cout << "run" << …