本程序的功能是：首先在二叉树的头文件中定义了二叉树的创建、插入、删除、三种遍历方式等，在主程序中则调用头文件来对创建的二叉树实现前序、中序、后续遍历，并打印最后遍历的结果。-The function of this program are: first define several operation of the binary treein the header file , including creating , inserting, deleting, and three trave