1.构建二叉树 2.编写递归算法，交换二叉树的左右子树； 3.输出按先序遍历得到的新二叉树结果。 -1 build a binary tree 2 write a recursive algorithm, exchange the left and right binary subtree 3 preorder traversal of the output obtained by a new binary tree results.

二叉树的操作，程序采用递归可进行树的遍历，求叶子节点的个数，交换左右子树等操作-Binary operation, the procedure can be carried out using recursive tree traversal, and the number of leaf nodes, exchange and other operations around subtree

二叉树的先序中序后序递归以及非递归遍历，二叉树的叶子节点等功能-Preorder in sequence after sequence of recursive and non-recursive traversal of a binary tree, the binary tree leaf nodes and other functions

二叉树的创建、插入、删除操作，计算二叉树的深度，获取二叉树的双亲结点、兄弟结点信息，计算二叉树的叶子数，二叉树的递归遍历、层次遍历-The basic function of binary Three implementation