It is a common function of Web browser to carry forward and backward in web pages recently accessed by users. One way to achieve this function is to use two stack (backward stack and forward stack) to store user access URLs.Back up backup: if the backward stack is empty, the command is ignored. Otherwise, press the current page into the forward stack and pop up a page from the backward stack as the current page. Forward forward: if the forward stack is empty, the command is ignored. Otherwise, press the current page into the backward stack and pop up a page from the forward stack as the current page. Access to a web site (VISIT <URL>): press the current page into the backward stack and use the web page as the current page to clear the forward stack.

Filename	Size	Update
chang's ջ\.vs\ConsoleApplication2\v14\.suo	22016	2018-03-07
chang's ջ\ConsoleApplication2\2.h	1413	2018-03-07
chang's ջ\ConsoleApplication2\ConsoleApplication2.vcxproj	7453	2018-03-07
chang's ջ\ConsoleApplication2\ConsoleApplication2.vcxproj.filters	1059	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleA.4A09BF85.tlog\CL.command.1.tlog	674	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleA.4A09BF85.tlog\CL.read.1.tlog	10024	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleA.4A09BF85.tlog\CL.write.1.tlog	516	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleA.4A09BF85.tlog\ConsoleApplication2.lastbuildstate	199	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleA.4A09BF85.tlog\link.command.1.tlog	1186	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleA.4A09BF85.tlog\link.read.1.tlog	2720	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleA.4A09BF85.tlog\link.write.1.tlog	494	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleApplication2.log	220	2018-03-07
chang's ջ\ConsoleApplication2\Debug\main.obj	205613	2018-03-07
chang's ջ\ConsoleApplication2\Debug\vc140.idb	330752	2018-03-07
chang's ջ\ConsoleApplication2\Debug\vc140.pdb	397312	2018-03-07
chang's ջ\ConsoleApplication2\main.cpp	2055	2018-03-07
chang's ջ\ConsoleApplication2.sln	1339	2018-03-07
chang's ջ\ConsoleApplication2.VC.db	8294400	2018-03-07
chang's ջ\Debug\ConsoleApplication2.exe	90112	2018-03-07
chang's ջ\Debug\ConsoleApplication2.ilk	465736	2018-03-07
chang's ջ\Debug\ConsoleApplication2.pdb	962560	2018-03-07
chang's ջ\.vs\ConsoleApplication2\v14	0	2018-03-07
chang's ջ\ConsoleApplication2\Debug\ConsoleA.4A09BF85.tlog	0	2018-03-07
chang's ջ\.vs\ConsoleApplication2	0	2018-03-07
chang's ջ\ConsoleApplication2\Debug	0	2018-03-07
chang's ջ\.vs	0	2018-03-07
chang's ջ\ConsoleApplication2	0	2018-03-07
chang's ջ\Debug	0	2018-03-07
chang's ջ	0	2018-03-07

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