completion of the process of non- recursive binary tree of the former preorder, the three traverse method, which traverse the most simple, so natural to the core code is much less.

preorder
........\link.h
........\node.h
........\preorder.h
........\queue.h
........\stack.h
........\treelib.h
........\treenode.h
........\treeprnt.h
........\visit.cpp

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