编写一个工资管理程序，雇员类作为所有类的基类，其派生类包括经理类，销售员类，计件工类和小时工类。激励享有固定的周薪，销售员的收入是一小部分的基本工资加上销售额的提成。计件工的收入完全取决于其生产的工件数量；小时工的收入以小时计算，再加上加班费。,Management procedures to prepare a wage, the employee category for all types of base class, the derived class, including category managers, sales category, type of piece workers and hourly workers category. Incentive to enjoy a fixed week, sales revenue is a small part of the basic salary plus sales commission. Piece-rate workers in the production of income depends entirely on the number of the workpiece　hourly workers with an hourly rate of income, plus overtime.