二叉树的便先中后三中递归和非递归方式的实现-binary tree after they were first three recursive and non - recursive approach to achieve

二叉树的递归（先序，中序，后序）遍历，创建叶子结点数，二叉树深度-Recursive binary tree (first order, in sequence, after the order) traversal, create leaf nodes, tree depth

生成规则：以如图8-27n＝2所示二叉树为基础，以每个分支为主树干，按照比例递归出另一个二叉树，如图8-27n＝3所示。依此类推，便形成了疏密有致的分形树，称为Caley树-Generated rules: in Figure 8-27n = 2 as shown is based on binary tree to each branch of the main trunk, in accordance with the proportion of another recursive bina

二叉树的递归（先序，中序，后序）遍历，创建叶子结点数，二叉树深度-Recursive binary tree (first order, in sequence, after the order) traversal, create leaf nodes, tree depth