第十三周 任务二 (2-1)

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#include<string>       using namespace std;        class Animal    {    public:        virtual void cry() const = 0;  //声明纯虚函数,供派生类定义使用   protected:        string name;    };        class Mouse: public Animal    {    public:        Mouse(string name){this->name = name;}           class Cat: public Animal    {    public:        Cat(string name){this->name = name;}        virtual void cry() const {cout << "我叫" << name << ",是一只猫,我的叫声是:喵喵喵!" << endl;}    };        class Dog: public Animal    {    public:        Dog(string name){this->name = name;}        virtual void cry() const {cout << "我叫" << name << ",是一条狗,我的叫声是:汪汪汪!" << endl;}    };       class Giraffe: public Animal    {    public:        Giraffe(string name){this->name = name;}        virtual void cry() const {cout << "我叫" << name << ", 是长颈鹿,脖子太长,发不出声音来!" << endl;}    };        int main( )    {        Animal *p;                     Mouse m("Jerry"); p = &m; p->cry(); //输出: 我叫Jerry,是一只老鼠,我的叫声是:吱吱吱!         Cat c("Tom");  p = &c; p->cry(); //输出: 我叫Tom,是一只猫,我的叫声是:喵喵喵!          Dog d("Droopy");  p = &d; p->cry(); //输出: 我叫Droopy,是一条狗,我的叫声是:汪汪汪!          Giraffe g("Gill");  p = &g; p->cry(); //输出: 我叫Gill,是长颈鹿,脖子太长,发不出声音来!              system("pause");            return 0;    }    


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