/************************************************************************/#include#include /************************************************************************//* 定义一个CLOCK类 *//************************************************************************/class CLOCK{ private: int hour, minute, second; public: CLOCK(); CLOCK(int, int, int); void update(); void display(); };/************************************************************************//* 定义CLOCK函数 *//************************************************************************/CLOCK::CLOCK(){ hour = minute = second = 0; cout << "\t One object initialalized." << endl;}/************************************************************************//* 定义CLOCK重载函数 *//************************************************************************/CLOCK::CLOCK(int h, int m, int s){ hour = h; minute = m; second = s; cout << "\t An object initialalized." << endl;}/************************************************************************//* *//************************************************************************/void CLOCK::update(){ second++; if(second == 60) { second = 0; minute ++; } if (minute == 60) { minute = 0; hour++; } if (hour == 24) { hour = 0; }}/************************************************************************//* *//************************************************************************/void CLOCK::display(){ cout << hour << ":" << minute << ":" << second <
上面的是函数的重载，
下面是函数的隐藏和覆盖
#includeint a = 5;int &b = a;/************************************************************************//* Base *//************************************************************************/class Base{public: virtual void fn();};/*Derived类的fn(int)函数隐藏了Base类的fn函数*/class Derived:public Base{public: /*派生类的函数与基类的函数同名，但参数列表不同 在这种情况下，不管基类的函数声明是否有virtual 关键字，基类的函数都将被隐藏。*/ void fn(int);};/*Derived2类的fn()函数隐藏了Derived类的fn(int)*/class Derived2:public Derived{public: void fn();};class animal{public: void eat() { cout << "animal eat" << endl; } void sleep() { cout << "animal sleep" << endl; } void breathe() { cout << "animal breathe" << endl; }};class fish:public animal{public: void breathe() { cout << "fish bubble" << endl; }};void fn(animal *pAn){ pAn->breathe();}void main(){ animal *pAn; fish fh; pAn = &fh; fn(pAn);}