问题及代码
/*
ALL rights reserved.
*文件名称: 初学对象13
作者:李长鸿
*完成时间:2015.6.3
*问题描述: 输入输出符号重载问题
*/
#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
{
string name;
char sex;
public:
Mouse(string n,char s='f'):name(n),sex(s) {}
void cry()
{
cout<<"动物为:mouse"<<"; "<<"name="<<name<<"; "<<"sex="<<sex<<"; "<<"叫声为:吱"<<endl;
}
};
class Cat:public Animal
{
string name;
char sex;
public:
Cat(string n,char s='f'):name(n),sex(s) {}
void cry()
{
cout<<"动物为:cat"<<"; "<<"name="<<name<<"; "<<"sex="<<sex<<"; "<<"叫声为:喵"<<endl;
}
};
class Dog:public Animal
{
string name;
char sex;
public:
Dog(string n,char s='f'):name(n),sex(s) {}
void cry()
{
cout<<"动物为:dog"<<"; "<<"name="<<name<<"; "<<"sex="<<sex<<"; "<<"叫声为:汪"<<endl;
}
};
class Giraffe:public Animal
{
string name;
char sex;
public:
Giraffe(string n,char s='f'):name(n),sex(s) {}
void cry()
{
cout<<"动物为:giraffe"<<"; "<<"name="<<name<<"; "<<"sex="<<sex<<"; "<<"叫声为:sorry,我脖子太长,发不出叫声"<<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;
}
本文通过C++代码示例介绍了面向对象编程中继承与多态的概念。定义了一个Animal基类及其派生类Mouse、Cat、Dog和Giraffe,通过运行时多态展示不同动物的叫声。
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