C++学习013多态

#include <iostream>
#include <stdio.h>
using namespace std;
class Animal
{
public:
    virtual void Cry()=0;
};
/*
void Animal::Cry()
{
    cout<<"base class"<<endl;
}
*/
class Dog:public Animal
{
public:
    virtual void Cry()
    {
        cout<<"wang,wang"<<endl;
    }
};
class Cat:public Animal
{
public:
    virtual void Cry()
    {
        cout<<"miao miao"<<endl;
    }
};
int main()
{
    Animal* animalone = new Dog;
    animalone->Cry();
    delete animalone;
    animalone = new Cat;
    animalone->Cry();
    Dog dog;
    dog.Cry();
    Cat cat;
    cat.Cry();
    return 0;
}