设计一个用于人事管理的People（人员）类。考虑到通用性，这里只抽象出所有类型人员都具有的属性：number（编号），sex（性别），birthday（出生日期），id（身份证号）等等。其中“出生日期”定义为一个“日期”类内嵌子对象。用成员函数实现对人员信息的录人和显示。要求包括：构造函数和析构函数、拷贝构造函数、内联成员函数、聚集。-Design a personnel management for the People (staff) category. Taking into account the general nature, where only the abstract type of personnel have all the attributes: number (number), sex (gender), birthday (date of birth), id (ID number) and so on. The " birth date"　is defined as a " date"　class embedded child objects. With members of the personnel function to realize the information recorded and displayed. Requirements include: the constructor and destructor, copy constructor, inline member functions, together.