此程序的功能是建立二叉树，并且对二叉树进行前序中序后序的遍历以及二叉树的显示等功能，主要是数据结构的小实验，对二叉树的理解很有帮助，程序采用C++编程，简单易懂。-Feature of this program is to build a binary tree, and on the binary tree in order to pre-order traversal and postorder binary tree display and other functions, the mai