实验四：派生类和继承（一）

福建农林大学实验报告

实验4 派生类和继承（一） 一、实验目的和要求

（1）掌握派生类的声明与定义方法，进一步理解类的继承的概念，能够定义和使用类的继承关系。 （2）熟悉公有派生和私有派生的访问特性。

二、实验内容和原理

1、(1)定义一个基类Animal，该类具有私有整型成员变量age,weight，构造派生类Dog公有继承 Animal。Dog类新增私有成员变量color，新增成员函数SetAge（int n）中直接给age赋值，新增成员函数SetWeight（int m）中直接给weight赋值，查看编译结果，并分析结果。(2)将类Animal中的age和weight为公有成员，重做第一步，并分析结果。(3)将类Animal中的age和weight为保护成员，重做第一步，并分析结果。（4）将派生类Dog的继承方式改为私有继承方式和保护继承方式重做以上各小题，并分析结果。

2、程序分析题（写出程序的输出结果，并分析结果）。

三、实验环境

1. 硬件：PC机；

2. 软件：Windows操作系统、Visual C++ 6.0

四、算法描述及实验步骤

1、（1）：

#include class animal

{private:int age,weight;}; class dog:public animal {private:char color[10]; public: int SetAge(int n) {age=n;return n;}

int SetWeight (int m) {weight=m;return m; }

};

int main()

{ int x,y; dog a;

cout<<\： \cin>>x;cout<

cout<<\ weight：\cin>>y;cout<

cout<<\

cout<<\ weight is\return 0; } （2）： #include class animal

{public:int age,weight;}; class dog:public animal {private:char color[10]; public: int SetAge(int n)

{age=n;return n;} int SetWeight (int m) {weight=m;return m; }

};

int main()

{ int x,y; dog a;

cout<<\：\cin>>x;cout<

cout<<\ weight：\cin>>y;cout<

cout<<\

cout<<\ weight is \return 0; } （3）：

#include class animal

{private:int age,weight;}; class dog:public animal {private:char color[10]; public: int SetAge(int n) {age=n;return n;}

int SetWeight (int m) {weight=m;return m; }

};

int main()

{ int x,y; dog a;

cout<<\：\cin>>x;cout<

cout<<\ weight：\

cin>>y;cout<

cout<<\

cout<<\ weight is \return 0; } （4）： #include class animal

{private:int age,weight;}; class dog:public animal {private:char color[10]; public: int SetAge(int n)

{age=n;return n;} int SetWeight (int m) {weight=m;return m; }

};

int main()

{ int x,y; dog a;

cout<<\：\cin>>x;cout<

cout<<\ weight：\cin>>y;cout<

cout<<\

cout<<\ weight is \return 0; } （5）：

#include class animal

{private:int age,weight;}; class dog:public animal {private:char color[10]; public: int SetAge(int n) {age=n;return n;}

int SetWeight (int m) {weight=m;return m; }

};

int main()

{ int x,y; dog a;

cout<<\：\cin>>x;cout<

cout<<\ weight：\

cin>>y;cout<

cout<<\cout<<\ weight is \return 0; } （6）： #include class animal

{private:int age,weight;}; class dog:public animal {private:char color[10]; public: int SetAge(int n)

{age=n;return n;} int SetWeight (int m) {weight=m;return m; }

};

int main()

{ int x,y; dog a;

cout<<\：\cin>>x;cout<

cout<<\ weight：\cin>>y;cout<

cout<<\

cout<<\ weight is \return 0; } （7）：

#include class animal

{private:int age,weight;}; class dog:public animal {private:char color[10]; public: int SetAge(int n) {age=n;return n;}

int SetWeight (int m) {weight=m;return m; }

};

int main()

{ int x,y; dog a;

cout<<\：\cin>>x;cout<

cout<<\ weight：\

cin>>y;cout<

cout<<\

cout<<\ weight is \return 0; } （8）： #include class animal

{private:int age,weight;}; class dog:public animal {private:char color[10]; public: int SetAge(int n)

{age=n;return n;} int SetWeight (int m) {weight=m;return m; }

};

int main()

{ int x,y; dog a;

cout<<\：\cin>>x;cout<

cout<<\ weight：\cin>>y;cout<