第十三周实验报告2

2.1）
#include "iostream"
#include<string>
using namespace std;
class Animal
{
public:
virtual void cry() {cout<<"不知哪种动物，让我如何学叫？"<<endl;}
};
class Mouse :public Animal
{
public:
void cry() {cout<<"我叫Jerry，是一只老鼠，我的叫声是：吱吱吱！"<<endl;}
Mouse(string Mouse_name);
private:
string Mouse_name;
};
class Cat :public Animal
{
public:
void cry() {cout<<"我叫Tom，是一只猫，我的叫声是：喵喵喵！"<<endl;}
Cat(string Cat_name);
private:
string Cat_name;
};
class Dog :public Animal
{
public:
void cry() {cout<<"我叫Droopy，是一条狗，我的叫声是：汪汪汪！"<<endl;}
Dog(string Dog_name);
private:
string Dog_name;
};
class Giraffe :public Animal
{
public:
void cry() {cout<<"我叫Gill，是长颈鹿，脖子太长，发不出声音来！"<<endl;}
Giraffe(string Giraffe_name);
private:
string Giraffe_name;
};

Mouse::Mouse(string Mouse_name)
{
this->Mouse_name=Mouse_name;
}
Cat::Cat(string Cat_name)
{
(*this).Cat_name=Cat_name;
}
Dog::Dog(string Dog_name)
{
this->Dog_name=Dog_name;
}
Giraffe::Giraffe(string Giraffe_name)
{
this->Giraffe_name=Giraffe_name;
}
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！
//delete p;
system("pause");
return 0;
}

2.2#include "iostream"
#include<string>
using namespace std;
class Animal
{
public:
virtual void cry() = 0;
};
class Mouse :public Animal
{
public:
void cry() {cout<<"我叫Jerry，是一只老鼠，我的叫声是：吱吱吱！"<<endl;}
Mouse(string Mouse_name);
private:
string Mouse_name;
};
class Cat :public Animal
{
public:
void cry() {cout<<"我叫Tom，是一只猫，我的叫声是：喵喵喵！"<<endl;}
Cat(string Cat_name);
private:
string Cat_name;
};
class Dog :public Animal
{
public:
void cry() {cout<<"我叫Droopy，是一条狗，我的叫声是：汪汪汪！"<<endl;}
Dog(string Dog_name);
private:
string Dog_name;
};
class Giraffe :public Animal
{
public:
void cry() {cout<<"我叫Gill，是长颈鹿，脖子太长，发不出声音来！"<<endl;}
Giraffe(string Giraffe_name);
private:
string Giraffe_name;
};

Mouse::Mouse(string Mouse_name)
{
this->Mouse_name=Mouse_name;
}
Cat::Cat(string Cat_name)
{
(*this).Cat_name=Cat_name;
}
Dog::Dog(string Dog_name)
{
this->Dog_name=Dog_name;
}
Giraffe::Giraffe(string Giraffe_name)
{
this->Giraffe_name=Giraffe_name;
}
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！
//delete p;
system("pause");
return 0;
}

#include "iostream"
#include<string>
using namespace std;
class Animal
{
public:
virtual void cry() = 0;
Animal(string Animal_name);
private:
string Animal_name;
};
class Mouse :public Animal
{
public:
void cry() {cout<<"我叫Jerry，是一只老鼠，我的叫声是：吱吱吱！"<<endl;}
Mouse(string Mouse_name);
};
class Cat :public Animal
{
public:
void cry() {cout<<"我叫Tom，是一只猫，我的叫声是：喵喵喵！"<<endl;}
Cat(string Cat_name);
};
class Dog :public Animal
{
public:
void cry() {cout<<"我叫Droopy，是一条狗，我的叫声是：汪汪汪！"<<endl;}
Dog(string Dog_name);
};
class Giraffe :public Animal
{
public:
void cry() {cout<<"我叫Gill，是长颈鹿，脖子太长，发不出声音来！"<<endl;}
Giraffe(string Giraffe_name);
};
Animal::Animal(string Animal_name)
{
this->Animal_name=Animal_name;
}
Mouse::Mouse(string Mouse_name):Animal(Mouse_name){}
Cat::Cat(string Cat_name):Animal(Cat_name){}
Dog::Dog(string Dog_name):Animal(Dog_name){}
Giraffe::Giraffe(string Giraffe_name):Animal(Giraffe_name){}
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！
//delete p;
system("pause");
return 0;
}