第十三周项目一：动物这样叫（一）


下面是给出的基类Animal声明和main()函数。

class Animal
{
public:
virtual void cry()
{
cout<<"不知哪种动物，让我如何学叫？"<<endl;
}
};
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;
}

程序的运行结果将是：



1、根据给出的main()函数和运行结果的提示，设计出相关的各个类，注意观察运行结果，提取出每个类中需要的数据成员，并匹配上需要的成员函数。

解决代码：

#include <iostream>
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:
Mouse(string nam,char s):name(nam),sex(s){}
virtual void cry();
protected:
string name;
char sex;
};
void Mouse::cry()
{
cout<<"我叫"<<name<<",";
if(sex=='m')
cout<<"我是一只男老鼠,";
else cout<<"我是一只女老鼠,";
cout<<"我的叫声是：吱吱吱！"<<endl;
}
class Cat: public Animal
{
public:
Cat(string nam):name(nam){};
virtual void cry();
protected:
string name;
};
void Cat::cry()
{
cout<<"我叫："<<name<<",是一只猫，我的叫声是：喵喵喵！"<<endl;
}
class Dog: public Animal
{
public:
Dog(string nam):name(nam){};
virtual void cry();
protected:
string name;
};
void Dog::cry()
{
cout<<"我叫："<<name<<",是一只狗，我的叫声是：汪汪汪！"<<endl;
}
class Giraffe :public Animal
{
public:
Giraffe(string nam,char s):name(nam),sex(s){};
virtual void cry();
protected:
string name;
char sex;
};
void Giraffe::cry()
{
cout<<"我叫："<<name<<",是"<<((sex=='m')?"男":"女")<<"长颈鹿，我的脖子太长，发不出声音来！"<<endl;
}
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;
}

运行结果：