2、设计职员类它继承了Person类并组合了Date类。编写主程序显示职员数据如下：姓名：杨萍出生日期： 1988106性别：女工作部门：团委职务：团委书记工资：6000要求：画出类之间的继承关系图；写出类的设计思路；完整c++代码。

类的继承关系图如下：

   +--------+
   | Person |
   +--------+
       |
       |
       v
   +--------+
   |  Date  |
   +--------+
       |
       |
       v
+---------------+
|   Employee    |
+---------------+
| -department   |
| -position     |
| -salary       |
+---------------+

类的设计思路：

1. Person类：包含姓名、出生日期、性别三个基本属性。其中出生日期通过组合Date类来实现。
2. Date类：包含年、月、日三个属性，通过构造函数初始化。
3. Employee类：继承了Person类，并添加了工作部门、职务、工资三个属性，使用private修饰，避免直接访问。对应的set和get函数用public修饰，方便外界操作。

完整c++代码如下：

#include <iostream>
using namespace std;

class Date {
private:
    int year;
    int month;
    int day;
public:
    Date(int y, int m, int d) {
        year = y;
        month = m;
        day = d;
    }
    void setDate(int y, int m, int d) {
        year = y;
        month = m;
        day = d;
    }
    void showDate() {
        cout << year << "." << month << "." << day << endl;
    }
};

class Person {
private:
    string name;
    Date birthdate;
    char sex;
public:
    Person(string n, Date b, char s) {
        name = n;
        birthdate = b;
        sex = s;
    }
    void setName(string n) {
        name = n;
    }
    void setBirthdate(Date b) {
        birthdate = b;
    }
    void setSex(char s) {
        sex = s;
    }
    string getName() {
        return name;
    }
    Date getBirthdate() {
        return birthdate;
    }
    char getSex() {
        return sex;
    }
};

class Employee : public Person {
private:
    string department;
    string position;
    double salary;
public:
    Employee(string n, Date b, char s, string d, string p, double sal) : Person(n, b, s) {
        department = d;
        position = p;
        salary = sal;
    }
    void setDepartment(string d) {
        department = d;
    }
    void setPosition(string p) {
        position = p;
    }
    void setSalary(double sal) {
        salary = sal;
    }
    string getDepartment() {
        return department;
    }
    string getPosition() {
        return position;
    }
    double getSalary() {
        return salary;
    }
    void showEmployee() {
        cout << "姓名：" << getName() << endl;
        cout << "出生日期：";
        getBirthdate().showDate();
        cout << "性别：" << getSex() << endl;
        cout << "工作部门：" << department << endl;
        cout << "职务：" << position << endl;
        cout << "工资：" << salary << endl;
    }
};

int main() {
    Date birth(1988, 10, 6);
    Employee emp("杨萍", birth, '女', "团委", "团委书记", 6000);
    emp.showEmployee();
    return 0;
}
``