二叉树生成及遍历。以某种形式建立二叉树逻辑结构信息，建立二叉链表，先作先序、中序、后序遍历，将二叉树中序线索化，中序遍历线索二叉树-Tree generation and traversal. Some form of information to establish the logical structure tree, the establishment of binary list, to make the first order, in sequence, after the traversal, binary tree in order to be clues, and clues in order binary tree traversal