case5：继承和派生的作用举例_2.0版本（使用继承）

格局上一次的讨论：将继承和派生后的写如下：

（1）main.cpp

/************************************************************************
* Object-Oriented Programming C++        
* @title School 1.0
* @author Haoaowei
*Email:[email protected]
*
************************************************************************/

#include "teacher.h"
#include "student.h"

int main()
{
	Teacher ta("TA");   //调用Teacher类
	Teacher tb("TB");
	Student s1("S1",2005); //初始化类Student
	Student s2("S2",2006);

	ta.teach("C++");   //类Teacher中的成员函数
	tb.teach("英语");

	s1.learn("C++");   //学生学习
    s2.learn("英语");

	tb.talk(ta,"请你吃饭去啊");   //老师类之间的通信
	ta.talk(tb,"好啊");
	s2.talk(s1,"我想去");        //学生类之间的通信
	s1.talk(s2,"我也想去");

	ta.talk(s1,"一起去吧");    //通过函数的重载实现
	tb.talk(s2,"你先回家做作业");

	ta.eat("包子");   //类Teacher中的成员函数
	tb.eat("饺子");
	s1.eat("豆浆");//类Student中的成员函数

	s2.doHomework("英语");  //类Student的函数
	
	return 0;
}

(2.1)person.h

#ifndef PERSON_H_INCLUDED
#define  PERSON_H_INCLUDED

#include "string"
using std::string;
class Person
{
public:
	Person( string name); //构造函数
	virtual ~Person(){};//析构函数
	//成员函数
	string getName() const { return name;}  //类外获取私有成员
	void talk(Person S,string stm);
	void eat(string food);
private:
	string name;
	
};

#endif

(2.2) person.cpp

#include "person.h"
#include "iostream"
using namespace std;
using std::string;

Person::Person( string name="hao"):name(name){} //构造函数{}

void Person::talk(Person S,string stm)
{
	cout<<name<<"对 " << S.name << "说: "<< stm <<endl;
}

void Person::eat(string food)
{
	cout<<name<< "吃: "<< food <<endl;

}

(3.1) student.h

#ifndef STUDENT_H_INCLUDED
#define  STUDENT_H_INCLUDED

#include "person.h"
#include "string"
using std::string;
class Student: public Person
{
public:
	Student( string name="hao",int grade=2011); //构造函数
	~Student(){};//析构函数
	//成员函数

    void learn(string course);
	void doHomework(string course);
private:
	int grade;
};

#endif

(3.2) student.cpp

#include "student.h"
#include "iostream"
using namespace std;
Student::Student( string name,int grade):Person(name),grade(grade) {}//构造函数

void Student::learn(string course) //成员函数，老师教
{
	cout<<grade<<"级学生"<<getName()<<"学习"<<course <<endl;

}

void Student::doHomework(string course)
{
	cout <<"学生"<<Person::getName()<<"做"<<course <<endl;

}

(4.1) teacher.h

#ifndef TEACHER_H_INCLUDED
#define  TEACHER_H_INCLUDED

#include "person.h"
#include "string"
using std::string;
class Teacher:public Person
{
public:
	Teacher( string name); //构造函数
	~Teacher(){};//析构函数
	//成员函数
	void teach(string stm);
};

#endif

(4.2) teacher.cpp

#include "teacher.h"
#include "iostream"
using namespace std;

Teacher::Teacher( string name):Person(name) {} //构造函数

void Teacher::teach(string stm) //成员函数，老师教
{
	cout<<"教师"<<getName() <<"教"<<stm <<endl;

}

运行结果：