说明：  5.模拟实现磁盘调度算法 实现FCFS、SSTF、SCAN、CSCAN等磁盘算法。接收用户输入参数，包括程序访问的磁道号等，输出结果包括访问的磁道顺序，平均寻道时间等。
(5. Analog achieve disk scheduling algorithms Achieve FCFS, SSTF, SCAN, CSCAN disk and other algorithms. Receiving user input parameters, including the program to access the track number, etc., track output including sequential access, the average seek time and the like.)