二叉树的实现，三种遍历方法。比较简单，是数据结构的基本知识-The realization of a binary tree, the three traversal methods. Relatively simple, basic knowledge of the data structure

C语言二叉树遍历，数据结构C语言描述，很简单的算法和代码-C language binary tree traversal

编写一个程序，通过前缀表达式来构造一个与之对应的算术表达式并存入二叉树中，通过中序遍历二叉树输出表达式及对其进行变量赋值，通过后序遍历二叉树计算表达式的值。(A program is written by prefix expression to construct an arithmetic expression corresponding to it and store it into two binary tree. Through traversing two fork tree out