说明：  进程调度模拟程序：假设有10个进程需要在CPU上执行，分别用：  先进先出调度算法；  基于优先级的调度算法；  最短执行时间调度算法 确定这10个进程在CPU上的执行过程。要求每次进程调度时在屏幕上显示：  当前执行进程；  就绪队列；  等待队列
(Process scheduling simulation program: Suppose there are 10 processes need to execute on the CPU, respectively:  FIFO scheduling algorithm  priority-based scheduling algorithm  shortest execution time scheduling algorithm to determine which 10 processes running on the CPU process. Every time process scheduling requirements displayed on the screen:  current implementation process  ready queue  waiting queue)