//BinaryTree.h -an interface file for a binary tree.#ifndef _BINARY_TREE_H#define _BINARY_TREE_H	#include "item.h"	typedef struct tree *Tree;	typedef void (*PerItemFunc)(Item *pItem);	Tree CreateTree();	void add(Tree tree, Key key, Item item);	void traversePreOrder(Tree tree, PerItemFunc pFunc);	void traverseInOrder(Tree tree, PerItemFunc pFunc);	void traversePostOrder(Tree tree,PerItemFunc pFunc);	Item *Find(Tree tree, Key key);	// --------------------------------------------	int deleteNode(Tree tree, Key key);	void deleteTree(Tree tree);#endif //__BINARY_TREE_H