C++练习

#include <iostream>

using namespace std;

class Animal
{
private:
    string name;
public:
    Animal()
    {}
    Animal(string name):name(name)
    {}
    virtual void perform()
    {
        cout << "" << endl;
    }

};
class Lion:public Animal
{
private:
    string progam;
public:
    Lion(){}
    Lion(string name,string n):Animal(name),progam(n)
    {}
    void perform()
    {
        cout << "狮子叫，" << endl;
    }

};

class Elephant:public Animal
{
private:
   string progam;
public:
   Elephant()
   {}
   Elephant(string name,string progam):Animal(name),progam(progam)
   {}
   void perform()
   {
       cout << "大象跳舞" << endl;
   }
};
int main()
{
    Lion a("狮子" ,"叫");
    Elephant b("大象" ,"跳舞");

    Animal *p;
    p = &a;
    p->perform();

    p = &b;
    p->perform();

    return 0;
}