第十三周实验报告二

<span style="font-size:16px;">#include <iostream>

#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;}
virtual void cry() const {cout << "我叫" << name << "，是一只老鼠，我的叫声是：吱吱吱！" << endl;}
};

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;

//p = new Animal(); p->cry(); //输出: 不知哪种动物，让我如何学叫？(问题出自此处)
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;
}
</span>