Introduction - If you have any usage issues, please Google them yourself
Design a People (personnel) class for personnel management. In view of generality, only the properties of all types of people are abstracted: number (numbering), sex (sex), birthday (date of birth), ID (ID number) and so on. The "birth date" is defined as a "date" class embedded child object. Member function is used to input and display personnel information. The requirements include: constructor and destructor, copy constructor, inline member function, and aggregate