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下面是一个给定的基类Animal声明和main()性能。
class Animal
{
public:
virtual void cry()
{
cout<<"不知哪种动物,让我怎样学叫?"<<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;
}/*
* Copyright (c) 2015,烟台大学计算机学院
* All right reserved.
* 作者:邵帅
* 文件:Demo.cpp
* 完毕时间:2015年06月07日
* 版本:v1.0
*/
#include <iostream>
using namespace std;
class Animal
{
public:
virtual void cry()
{
cout<<"不知哪种动物。让我怎样学叫?"<<endl;
}
};
class Mouse:public Animal
{
public:
Mouse(string n,char s):name(n),sex(s){}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅"<<((sex=='f')?"女":"男")<<"老鼠。我的叫声是:吱吱吱!"<<endl;
}
private:
string name;
char sex;
};
class Cat:public Animal
{
public:
Cat(string n):name(n){}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅猫,我的叫声是:喵喵喵!
"<<endl;
}
private:
string name;
};
class Dog:public Animal
{
public:
Dog(string n):name(n){}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅狗,我的叫声是:汪汪汪。"<<endl;
}
private:
string name;
};
class Giraffe:public Animal
{
public:
Giraffe(string n,char s):name(n),sex(s){}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅"<<((sex=='f')?"女":"男")<<"长颈鹿,我的脖子太长,可是发不出来声。"<<endl;
}
private:
string name;
char sex;
};
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;
}
/*
* Copyright (c) 2015,烟台大学计算机学院
* All right reserved.
* 作者:邵帅
* 文件:Demo.cpp
* 完毕时间:2015年06月07日
* 版本:v1.0
*/
#include <iostream>
#include <string>
using namespace std;
class Animal
{
public:
virtual void cry()=0;
};
class Mouse:public Animal
{
public:
Mouse(string n,char s):name(n),sex(s){}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅"<<((sex=='f')?"女":"男")<<"老鼠。我的叫声是:吱吱吱!"<<endl;
}
private:
string name;
char sex;
};
class Cat:public Animal
{
public:
Cat(string n):name(n){}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅猫,我的叫声是:喵喵喵!"<<endl;
}
private:
string name;
};
class Dog:public Animal
{
public:
Dog(string n):name(n){}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅狗,我的叫声是:汪汪汪!
"<<endl;
}
private:
string name;
};
class Giraffe:public Animal
{
public:
Giraffe(string n,char s):name(n),sex(s){}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅"<<((sex=='f')?"女":"男")<<"长颈鹿。我的脖子太长,可是发不出来声。"<<endl;
}
private:
string name;
char sex;
};
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;
}
改造上面的程序,将“名字”成员作为抽象类Animal数据成员被各派生类使用。
/*
* Copyright (c) 2015,烟台大学计算机学院
* All right reserved.
* 作者:邵帅
* 文件:Demo.cpp
* 完毕时间:2015年06月07日
* 版本:v1.0
*/
#include <iostream>
#include <string>
using namespace std;
class Animal
{
public:
Animal(string n):name(n){}
virtual void cry()=0;
protected:
string name;
};
class Mouse:public Animal
{
public:
Mouse(string n,char s):Animal(n),sex(s) {}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅"<<((sex=='f')?"女":"男")<<"老鼠,我的叫声是:吱吱吱!
"<<endl;
}
private:
char sex;
};
class Cat:public Animal
{
public:
Cat(string n):Animal(n) {}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅猫,我的叫声是:喵喵喵!
"<<endl;
}
};
class Dog:public Animal
{
public:
Dog(string n):Animal(n) {}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅狗,我的叫声是:汪汪汪!
"<<endl;
}
};
class Giraffe:public Animal
{
public:
Giraffe(string n,char s):Animal(n),sex(s) {}
virtual void cry()
{
cout<<"我叫"<<name<<",是一仅仅"<<((sex=='f')?"女":"男")<<"长颈鹿,我的脖子太长,可是发不出来声!"<<endl;
}
private:
char sex;
};
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;
}
@ Mayuko
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原文地址:http://www.cnblogs.com/bhlsheji/p/4821027.html