实现公司人员管理的系统.某小型公司，主要有四类人员：经理、兼职技术人员、销售经理和兼职推销员。现在，需要存储这些人员的姓名、编号、级别、当月薪水，计算月薪总额并显示全部信息。 -The achievement of company personnel management system. A small business, there are four categories of personnel: managers, part-time technical staff, sales manager and part-time salesman. Now, the need to store the names of the officers, number, grade, month salary to calculate the total monthly salary and display all of the information.