用数组和指针实现公司职员的信息管理程序，用于VC练习-Array and pointer with staff to achieve the information management procedures for the VC practice

某小型公司有四类人员：总经理、技术人员、销售经理、推销员。设计一个基类Person，并派生出Employee（职员）-A small company has four categories of personnel: general manager, technical staff, sales manager, salesman