C语言作业，三类进程管理方法， 按优先数调度算法实现处理器调度， 可变分区管理方式下采用首次适应算法分配内存， 用位示图管理磁盘存储空间-C language operations, three types of process management methods, according to the number of priority scheduling algorithm processor scheduling, using the first-fit algorithm to all