说明：  操作系统课程设计： 编写并调试一个单道批处理系统的作业调度程序。要求： (1)至少有四种的作业调度算法。 (2)能根据不同的调度算法算出每个作业的周转时间和带权周转时间，并通过一组作业算出系统的平均周转时间和平均带权周转时间，比较各种算法的优缺点。 (3)设计一个实用的用户界面，以便选择不同的作业调度算法。
(courses on operating system design : the preparation and debugging a single channel system of batch job scheduling procedures. : (1) there are at least four operations scheduling algorithm. (2) according to the scheduling algorithm calculated for each operation and the turnaround time with the right turnaround time, and through a group of operating system calculated the average turnaround time and the average turnaround time with the right to compare the advantages and disadvantages of the various algorithms. (3) the design of a practical user interface, in order to choose a different job-scheduling algorithms.)