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Write a small company payroll system. The company has four main categories of staff: manager, part-time technicians, salespeople and sales managers. Requirements for storage and display of each type of number ( 100 starting number), name and salary, and gives staff when creating each type of object constructor execution order (monthly salary is calculated as: a fixed monthly salary of 8,000 yuan manager, part-time technical staff 100 yuan/hour, the salesman of the month for 4 of sales, sales manager, Paul bottom wages 5000 yuan plus 5 of their control department of sales), require virtual function implementation.