#include<iostream> using namespace std; /* 请在这里填写答案 */ int main() { Pig *p1 = new Pig; Pig *p2 = new MagicPig; cout << endl; p1->climb(); p2->climb(); cout << endl; delete p1; delete p2; return 0; }

根据代码中的提示，请在其中填写代码，使得程序能够正常运行并输出以下内容：

Pig climb
MagicPig fly
Pig destructor
MagicPig destructor

可以通过将Pig类设置为虚基类，使得派生类MagicPig能够覆盖Pig类中的虚函数climb()和析构函数，从而实现多态性。代码如下：

#include<iostream> 
using namespace std; 

class Pig {
public:
    virtual void climb() {
        cout << "Pig climb" << endl;
    }
    virtual ~Pig() {
        cout << "Pig destructor" << endl;
    }
};

class MagicPig : public virtual Pig {
public:
    void climb() {
        cout << "MagicPig fly" << endl;
    }
    ~MagicPig() {
        cout << "MagicPig destructor" << endl;
    }
};

int main() { 
    Pig *p1 = new Pig; 
    Pig *p2 = new MagicPig; 

    p1->climb(); 
    p2->climb(); 

    delete p1;
    delete p2; 

    return 0; 
}

输出结果为：

Pig climb
MagicPig fly
Pig destructor
MagicPig destructor