C++语言的函数重载、重写、覆盖的示例，及C++多态的两种方法

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如下面代码段：

（1）本代码段包括了函数的重载、重写、覆盖。

（2）本代码段示例了实现多态的两种方法：基类的指针和基类的引用。

#include <iostream>using namespace std;class Base{public:    //fun是函数重写，实现多态，    virtual void fun(int num=10)    {        cout<<"i'm base fun with "<<num<<endl;    }    //fun1是函数覆盖    void fun1()    {        cout<<"i'm base fun with "<<0<<endl;    }};class Derived :public Base{public:    virtual void fun(int num=20)    {        cout<<"i'm derived fun with "<<num<<endl;    }    void fun1()    {        cout<<"i'm derived fun with "<<1<<endl;    }    //本fun1是函数重载    void fun1(int num)    {        cout<<"i'm derived fun with "<<num<<endl;    }};int main(int argc, char **argv){    Derived d;    Base &b = d;    b.fun1();    d.fun1();    Base *pb = &d;    pb->fun1();    ((Derived*)pb)->fun1();    d.fun1(10);    system("pause");    return 0;}

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