数据结构二叉树的建立与遍历，实验内容是以二叉链表作为存储结构，对建立的二叉树进行遍历（先序，中序，后序），采用递归方法实现。-Binary tree data structure and traversal of the establishment of the experimental binary content is stored as a linked list structure for the establishment of the binary tree traversal (f