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Description: 功能介绍：
l 输入进程P总共有的页面数，l 并输入系统已经在内存中分配的页面数。当所分配的页面数大于进程P的页面数时，l 则不l 需要进行页面调度工作。
l 由进程P的页面数目，l 程序随机生成一些访问内存的页面号，l 为简化程序，l 这些页面号的数目同l 进程P的进程数目一致（这个缺陷也有待改进）。
l 由用户选择FIFO算法还是LRU算法对进程P的页面访问内存分配的页面进行分配，l 并输出具体的页面访问过程。
原理介绍：
请求页式管理中的置换算法：置换算法在内存中没有空闲页面时调用。它的目的是选出一个被淘汰的页面。如果内存中有足够的空闲页面存放所调入的页，则不必使用置换算法。
先进先出算法FIFO：该算法总是选择在内存驻留时间最长的一页将其淘汰。其认为先调入内存的页不再被访问的可能性要比其他页大，因而选择最先调入内存的页换出。
最近最久没使用页面淘汰算法LRU-functional presentations : 1 P process imported a total of some pages. l and enter the system has been allocated in memory of a few pages. When the distribution of more than a few pages of the process P pages, l l not need pages scheduling work. L P process by the number of pages, l procedures for random number generation to the memory pages, l To simplify procedures, l these pages, with the number of P l process consistent number of processes (the defect has yet to be improved). L chosen by the user FIFO or LRU algorithm algorithm to process P pages allocated to the memory pages for distribution, l and output specific pages course of the visit. Principle introduced : request for the page-style management of replacement algorithm : Replacement Algorithms in memory when no spare pages call.
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Description: 这是一个页面置换算法的实现，功能描述：输入可用内存页面数和一个作业访问逻辑页号的序列 *给出FIFO、LRU、OPT算法的缺页中断率 *本程序中设初始页框里的页号与实际页号都不同-This is a page replacement algorithm to achieve functional description : Importation of a few pages available memory and a logic operation visit, the page is given sequence* FIFO, the LRU, OPT algorithm vacancy rate* Page interrupted the proceedings set up the initial page listing page, and the actual page numbers are different
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Description: 基本算法思想 OPT：该算法的基本思想是用二维数组page2[40][2] 的第一列存储装入内存的页面，而第二列用作标记位计数器。每当发生缺页时，就从内存中调出一页，首先将内存中的页面一一与要调入内存中的页面之后的页面比较，如果两个页面不相等，则内存中相应的页面的标记位计数器加一，直至到有相等的页面，则该页面的比较停止，再重复以上操作，直至内存中的页面全部比较完。然后找出内存中页面的标记位最大的页面，而该页就是要置换出来的页。 FIFO: 该算法的基本思想是用队列queue存储内存中的页面，队列的特点是先进先出，与该算法是一致的，所以每当发生缺页时，就从队头删除一页，即队头指针加一，而从队尾加入缺页，队尾指针加一。 LRU: 该算法的基本思想是用二维数组page2[40][2] 的第一列存储装入内存的页面，而第二列用作标记位计数器。每当使用页面时，该页面的标记位计数器加一。发生缺页时，就从内存中页面标记最小的一页，调出该页，并且该页后面的页面在数组中的位置前移，而缺页就放在数组后面。-basic algorithm thinking OPT : The basic idea of the algorithm is a two-dimensional array page2 [40] [2], the first storage pages loaded into memory, and the second for the markers out counter. Whenever there are missing pages, from memory a redeployment, the first memory pages on January 1 and transferred to the memory page after page, two pages, if not equal, then the corresponding memory pages marked increase a bit counter, until the equivalent of a page, the page more stop and then to repeat the operation, until the memory of all the pages compared End. Then find memory pages marking the largest-page, the page is to the replacement page. FIFO : The basic idea of the algorithm is used queue queue storage memory pages, and the queue is FIFO features, and the algorithm is the same, so whe
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