这个程序采用先序建立二叉树，并分别使用递归和非递归算法实现了对该二叉树的先中后序的遍历输出，并给出了一定的使用说明-this procedure was used in order to establish a binary tree respectively, and the use of recursive and non- recursive algorithm of this binary tree after the first sequence which Ergodic output, and gives a certain degree of use