vc开发的二叉树实现程序，创建二叉树时，采用先序（node-left-right）的方式，每输入一个结点值（字符），敲一下回车键，再输入下一个节点值，空结点值用 * 表示，每个叶子节点必须后跟两个空指针，并输出了它的中序遍历形式和绘图的形式，有助于初学者加深对二叉树概念的理解-Vc development of binary tree realize the program, creating a binary tree, the first order (node-left-right) way, each input a node values (characters), knock the enter key, then enter the next node values, the empty node value using　*　says, each leaf node must heel two empty pointer, and the output of it in order to traverse form and drawing form, help beginners to deepen understanding of the concept of binary tree