该程序的功能是实现二叉树结点的类型定义和对二叉树的基本操作。该程序包括二叉树 结构类型以及每一种操作的具体的函数定义和主函数。 -Feature of the program is the type definition and basic operations on binary tree node binary tree. The program includes a binary tree structure and the specific type of function defi