新的继承与派生.doc

实验四继承与派生（二）（多重继承与虚基类）班级：计算机1101 姓名：* 学号：2011*【实验目的】1. 了解多重继承的概念。2. 理解为了避免同一基类出现多个重复的副本而采用的虚基类概念和虚拟继承。3. 学习利用虚基类解决二义性问题。【实验内容】 设计一个用于人事管理的people（人员类）基类。考虑到通用性，仅只抽象出所有类型人员都具有的属性：编号、姓名、性别、出生日期、身份证号等；从people累类派生出student（学生类），并添加属性：班号classno；从people类派生出teacher（教师类），并添加属性：职务pricipalship、部门department；从student类在派生出graduate（研究生类），添加属性：专业subject、导师adviser（teacher类）；最后从教师类和研究生类一起派生出TA（助教类）。设计师应注意虚基类的使用，注意重载相应的成员函数，然后测试这些类。【UML图】【实验程序】#include#includeusing namespace std;class Dateprivate:int d_year;int d_month;int d_day;public:Date(int y=0,int m=0,int d=0):d_year(y),d_month(m),d_day(d)void set(int y,int m,int d)d_year=y;d_month=m;d_day=d;void show()cout出生日期：d_year-d_month-d_dayendl;class peopleprotected:Date m_date;long m_no;string m_ident_no;string m_name;string m_sex;public:people(long no,string name,string sex,string ident_no,Date date);people(people &p);void set(long no,string name,string sex,string ident_no,Date date);void set(people &p);void show();people:people(long no,string name,string sex,string ident_no,Date date):m_date(date)m_no=no;m_name=name;m_sex=sex;m_ident_no=ident_no;people:people(people &p)m_no=p.m_no;m_name=p.m_name;m_sex=p.m_sex;m_ident_no=p.m_ident_no;m_date=p.m_date;void people:set(long no,string name,string sex,string ident_no,Date date)m_no=no;m_name=name;m_sex=sex;m_ident_no=ident_no;m_date=date;void people:set(people &p)m_no=p.m_no;m_name=p.m_name;m_sex=p.m_sex;m_ident_no=p.m_ident_no;m_date=p.m_date;void people:show()cout序号：m_noendl;cout姓名：m_nameendl;cout性别：m_sexendl;cout系统编号：m_ident_noendl;m_date.show();class student:virtual public peopleprotected: string s_classno;public:student(people &p,string classno);/student(long no,string name,string sex,string ident_no,Date date,string classno):people(no,name,sex,ident_no,date)s_classno=classno;student(student &s);void show();student:student(people &p,string classno):people(p)s_classno=classno;student:student(student &s):people(s)s_classno=s.s_classno; void student:show()people:show();cout班号：s_classnoendl;class teacher:virtual public peopleprotected:string t_pricipleship;string t_department;public:friend class graduate;teacher(people &p,string pricipleship,string department);/teacher(long no,string name,string sex,string ident_no,Date date,string pricipleship,string department):people(no,name,sex,ident_no,date)t_pricipleship=pricipleship;t_department=department;teacher(teacher &t);void show();teacher:teacher(people &p,string pricipleship,string department):people(p)t_pricipleship=pricipleship;t_department=department;teacher:teacher(teacher &t):people(t)t_pricipleship=t.t_pricipleship;t_department=t.t_department;void teacher: show()people:show();cout职务：t_pricipleshipendl;cout部门：t_departmentendl;class graduate:public studentprotected:string g_subject;teacher g_adviser;public:graduate(student &s1,string subject,teacher & t1);/graduate(long no,string name,string sex,string ident_no,Date date,string classno,string subject,teacher adviser):people(no,name,sex,ident_no,date),student(no,name,sex,ident_no,date,classno),g_adviser(adviser)g_subject=subject;graduate(graduate &g);void show();graduate:graduate(student &s1,string subject,teacher &t1):people(s1),student(s1),g_adviser(t1)g_subject=subject;graduate:graduate(graduate &g):people(g),student(g),g_adviser(g.g_adviser)g_subject=g.g_subject;void graduate:show()student:show();cout项目：g_subjectendl;cout导师信息：endl-endl;g_adviser.show();class TA:public graduate,public teacherpublic:TA(graduate &g,teacher &t);/TA(long no,string name,string sex,string ident_no,Date date,string classno,string subject,teacher adviser,string pricipleship,string department):people(no,name,sex,ident_no,date),graduate(no,name,sex,ident_no,date,classno,subject,adviser),teacher(no,name,sex,ident_no,date,pricipleship,department)TA(TA &T);void show();TA:TA(graduate &g,teacher &t):people(g),graduate(g),teacher(t)/此处不需要给中间类赋值TA:TA(TA &T):people(T),graduate(T),teacher(T)void TA:show()graduate:show();cout职务：t_pricipleshipendl;cout部门：t_departmentendl;void main()Date d(2012,4,20);people p(2011,xiaozi,Man,42032219920227,d);student s(p,1104);/student s(2011,xiaozi,Man,42032219920227,d,1104);/teacher t(1101,Mr Li,Man,1908147679,d,讲师,research);teacher t(p,讲师,research);graduate g(s,computer,t);/TA T(2011,xiaozi,Man,42032219920227,d,1104,computer,t,assistant,teaching);TA T(g,t);cout 欢迎进入信息统计中心，以下将是您所需的全部信息，请查收：endlendlendl;cout*endl;cout基类信息表：endl;T.people:show();cout*endl学生类信息表：endl;T.student:show();cout*endl老师类信息表：endl;T.teacher:show();cout*endl研究生类信息表：endl;T.graduate:show();cout*endl助教类信息表：endl;T.show();coutendl*endl;【实验小结】 一个类可以在一个类族中既被用作虚基类，也被用作非虚基类。 在派生类的对象中，同名的虚基类只产生一个虚基类子对象，而某个非虚基类产生各自的子对象 虚基类子对象是由最派生类的构造函数通过调用虚基类的构造函数进行初始化的。 派生类的构造函数的成