二叉排序树BST+求树深度算法

#include "stdio.h"
#include "malloc.h"
typedef struct node
{
	int key;
	struct node *lchild, *rchild;

}BSTNode, *BSTree;

void InsertBST(BSTree *bst, int key)
{
	BSTree s;
	if (*bst == NULL)
	{
		s = (BSTree)malloc(sizeof(BSTNode));
		s->key = key;
		s->lchild = NULL;
		s->rchild = NULL;
		*bst = s;
	}
	else if (key<(*bst)->key)	InsertBST(&((*bst)->lchild), key);
	else if (key > (*bst)->key)		InsertBST(&((*bst)->rchild), key);
}

void CreateBST(BSTree *bst)
{
	int key;
	*bst = NULL;
	scanf("%d",&key);
	while (key != 0)
	{
		InsertBST(bst, key);
		scanf("%d",&key);
	}
}

void inorder(BSTree bt)
{
	if (bt != NULL)
	{
		inorder(bt->lchild);
		printf("%3d",bt->key);
		inorder(bt->rchild);
	}
}

int FindTreeDeep(BSTree BT){
     int deep=0;
     if(BT){
         int lchilddeep=FindTreeDeep(BT->lchild);
         int rchilddeep=FindTreeDeep(BT->rchild);
         deep=lchilddeep>=rchilddeep?lchilddeep+1:rchilddeep+1;
     }
     return deep;
}

int main()
{
	BSTree bt;
	CreateBST(&bt);
	inorder(bt);
	printf("\n");
	printf("%d\n",FindTreeDeep(bt));
	getchar();
	return 0;
}