1. 从people(人员)类派生出student(学生)类
添加属性：班号char classNO[7]；从people类派生出teacher(教师)类，
添加属性：职务char principalship[11]、部门char department[21]。
从student类中派生graduate(研究生)类，添加属性：专业char subject[21]、
导师char teacher_adviser[21]；从graduate类和teacher类派生出TA(助教生)类，
注意虚基类的使用。重载相应的成员函数，测试这些类。
2. 代码如下：
```
#include<iostream>
#include<string>
#include<cstring>
#include<cstdio>
#include<cstdlib>
using namespace std;
class Data {
public:
Data() {}
Data(int yy, int mm, int dd);
Data(Data &ap);
~Data();
int get_year();
int get_month();
int get_day();
void set_year(int y);
void set_month(int m);
void set_day(int d);
private:
int year;
int month;
int day;
};
Data::Data(int yy, int mm, int dd) {
year = yy;
month = mm;
day = dd;
}
Data::Data(Data &ap) {
year = ap.year;
month = ap.month;
day = ap.day;
}
Data::~Data() {
}
int Data::get_day() {
return day;
}
int Data::get_month() {
return month;
}
int Data::get_year() {
return year;
}
void Data::set_day(int d) {
day = d;
}
void Data::set_month(int m) {
month = m;
}
void Data::set_year(int y) {
year = y;
}
class People {
public:
People(int num, string se, Data birthd, string iid);
People(People &tp);
People() {}
People get_People();
~People() {
}
void set_number(int num) {
number = num;
}
void set_sex(string se) {
sex = se;
}
void set_birthday(Data birth) {
birthday = birth;
}
void set_id(string iidd) {
id = iidd;
}
int get_number();
string get_sex();
Data get_birthday();
string get_id();
void details();
private:
int number;
string sex;
Data birthday;
string id;
};
inline int People::get_number() {
return number;
}
inline string People::get_sex() {
return sex;
}
inline string People::get_id() {
return id;
}
Data People::get_birthday() {
return birthday;
}
void People::details() {
cout << "Number:" << number << endl;
cout << "Sex:" << sex << endl;
cout << "Birhtday:" << birthday.get_year() << "/" << birthday.get_month() << "/" << birthday.get_day() << endl;
cout << "ID:" << id << endl;
}
People::People(int num, string se, Data birth, string iid) :birthday(birth) {
number = num;
sex = se;
id = iid;
}
People People::get_People() {
int num, yy, mm, dd;
string ID, se;
cout << "Please enter the number of the people:";
cin >> num;
cout << "Please enter the sex of the people:(male or female)";
cin >> se;
cout << "Please enter the birthday of the people:" << endl
<< "(Warnning:The format is similar to 1998 8 3)" << endl;
cin >> yy >> mm >> dd;
cout << "Please enter the id of the people:";
cin >> ID;
Data birth(yy, mm, dd);
id = ID;
number = num;
sex = se;
birthday = birth;
return *this;
}
People::People(People &tp) {
number = tp.get_number();
sex = tp.get_sex();
id = tp.get_id();
birthday = tp.get_birthday();
}
class Student :virtual public People {
public:
char classNo[7];
Student(int num, string se, Data birthd, string iid, char a[7]) :People(num, se, birthd, iid) {
strcpy(classNo, a);
}
~Student() {
};
void Show_Student() {
cout << "This is student:" << endl;
cout << "ClassNo :" << classNo << endl;
}
};
class Teacher :virtual public People {
public:
char principalship[11];
char department[21];
Teacher(int num, string se, Data birthd, string iid, char a[11],char b[21]) :People(num, se, birthd, iid) {
strcpy(principalship, a);
strcpy(department, b);
}
Teacher() {
}
void Show_Teacher() {
cout << "This is teacher:" << endl;
cout << "Principalship :" << principalship << endl;
cout << "Department :" << department << endl;
}
};
class Graduate :virtual public Student {
public:
char subject[21];
Teacher adviser;
Graduate(int num, string se, Data birthd, string iid, char a[7], char c[21],Teacher vt) :People(num, se, birthd, iid), Student(num, se, birthd, iid, a) {
strcpy(subject, c);
adviser = vt;
}
~Graduate() {
}
void Show_Graduate() {
cout << "This is Graduate:" << endl;
cout << "The subject:" << subject << endl;
cout << "The adviser teacher:" << endl;
cout << "Principalship:" << adviser.principalship<< endl;
cout << "Department:" << adviser.department << endl;
cout << endl;
}
};
class TA :public Graduate, public Teacher {
public:
TA(int num, string se, Data birthd, string iid, char a[7], char c[21], Teacher vt) :People(num, se, birthd, iid), Student(num, se, birthd, iid, a), Graduate(num, se, birthd, iid, a, c, vt) {
}
~TA() {
}
void Show_TA() {
cout << "This is TA:" << endl;
cout << "The classNo:" << classNo << endl;
}
};
int main()
{
People asp;
asp.get_People();
asp.details();
Data a(1998, 8, 3);
Student b(18,"male",a,"110","001");
b.Show_Student();
Data a1(1987, 8, 3);
Teacher c(25, "female", a1,"1614","Advanced", "Promotion");
c.Show_Teacher();
Data a2(1990, 8, 3);
Graduate d(22, "female", a2, "1013", "111", "CS", c);
d.Show_Graduate();
return 0;
}
```
