编写并调试一个单道处理系统的作业等待模拟程序。

　　作业等待算法：分别采用先来先服务（FCFS），最短作业优先（SJF）、响应比高者优先（HRN）的调度算法。

　　对每种调度算法都要求打印每个作业开始运行时刻、完成时刻、周转时间、带权周转时间，以及这组作业的平均周转时间及带权平均周转时间，以比较各种算法的优缺点。

-Write and debug a single-channel processing system operating to wait for simulation program.

Operation waiting algorithm: respectively, a first-come first-served (FCFS), shortest job first (SJF), respond to than high preferred (HRN) scheduling algorithm.

Scheduling algorithms are required for each print job starts running each time, the completion of time, turnaround time, with the right turnaround time, and this group of operations, the average turnaround time and the weighted average turnaround time to compare the advantages and disadvantages of various algorithms