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Write a small company payroll system. The company has four categories of persons: manager, part-time technical staff, sales staff and sales manager. Required to store and display the number of each type of personnel (from 100 cases of number), name and salary, and gives each type of object is created the constructor execution order (monthly salary is calculated as: manager of fixed monthly salary of 8,000 yuan, part-time technical staff 100 yuan/hour, the salesman for the month of 4 of sales, sales manager for security at the end of their wages plus 5,000 control department sales 5 ), require virtual function implementation.