animalの鳴き声

#include <iostream>
#include <string>
using namespace std;
class Animal
{
public:
    string nam;
  virtual void cry()
    {
      cout<<"不知哪种动物，让我如何学叫？"<<endl;
      }
    };

class Cat:public Animal
{
public:
    Cat(string nam):name(nam){};
    void cry()
    {
        cout<<"我叫"<<name<<","<<"是一只猫，我的叫声是：喵喵喵!"<<endl;
    }
    private: string name;
};
class Dog:public Animal
{
public:
    Dog(string nam):name(nam){}
    void cry()
    {


    cout<<"我叫"<<name<<","<<"是一条狗，我的叫声是：汪汪汪!"<<endl;
};
private: string name;
};
class Mouse:public Animal{
public:
    Mouse(string n,char s):name(n),sex(s){}
    void cry(){
    cout<<"我叫"<<name<<"，是一只"<<((sex=='m')?"男":"女")<<"老鼠，我的叫声是：吱吱吱"<<endl;
    }
private:
    string name;
    char sex;

};

class Giraffe:public Animal
{
public:
Giraffe(string n,char s):name(n),sex(s){}
    void cry()
{
  cout<<"我叫"<<name<<","<<"是一只"<<((sex='m')?"男":"女")<<"长颈鹿，我的脖子太长了叫不出声来!"<<endl;
};
private:
    string name;
    char sex;
};

int main()
{
    Animal *p;
    p=new Animal();
    p->cry();
    Mouse m1("Jerry",'m');
    p=&m1;
    p->cry();
    Mouse m2("Jemmy",'f');
    p=&m2;
    p->cry();
    Cat c1("Tom");
    p=&c1;
    p->cry();
    Dog d1("Droopy");
    p=&d1;
    p->cry();
    Giraffe g1("Gill",'m');
    p=&g1;
    p->cry();
    return 0;
}