学步园

思考了一下午啊，看来自己太水了。

#include <stdio.h>
#include <stdlib.h>

typedef int elemtype;		//整形为树的数据类型
typedef struct node
{
	elemtype data;
	struct node *lchild,*rchild;
}btree,*ptree;

void (*visit)(elemtype e);

//树的创建
ptree CreatTree()
{
	ptree root;
	elemtype data;
	scanf("%d",&data);

	if(data == 0)root = NULL;		//0 代表空子树
	else
	{
		root = (ptree)malloc(sizeof(btree));
		if(!root)exit(1);

		root->data = data;
		root->lchild = CreatTree();
		root->rchild = CreatTree();
	}
	return root;
}

void PrintResult(elemtype e)
{
	printf("%d ",e);
}

//前序遍历二叉树
void PreOrderTree(ptree root,void (*visit)(elemtype ))
{
	if(root)
	{
		(visit)(root->data);
		PreOrderTree(root->lchild,visit);
		PreOrderTree(root->rchild,visit);
	}
}

//中序遍历二叉树
void InOrderTree(ptree root,void (*visit)(elemtype ))
{
	if(root)
	{
		PreOrderTree(root->lchild,visit);
		(visit)(root->data);
		PreOrderTree(root->rchild,visit);
	}
}

//后序遍历二叉树
void PostOrderTree(ptree root,void (*visit)(elemtype ))
{
	if(root)
	{
		PreOrderTree(root->lchild,visit);
		PreOrderTree(root->rchild,visit);
		(visit)(root->data);
	}
}

//求树的叶子数目
int SumLeaf(ptree root)
{
	int count=0,m,n;
	if(root)
	{
		if(root->lchild == NULL && root->rchild == NULL)count++;
		m = SumLeaf(root->lchild);
		count += m;
		n = SumLeaf(root->rchild);
		count += n;
	}
	return	count;
}

//求树的深度
int TreeDepth(ptree root)
{
	int depth=0,depthl,depthr;
	if(!root)depth=0;
	else
	{
		depthl = TreeDepth(root->lchild);
		depthr = TreeDepth(root->rchild);
		depth += 1 + (depthl > depthr ?depthl:depthr);
	}

	return depth;
}

//销毁二叉树
void DstroyTree(ptree T)
{
	if(T == NULL)return ;
	if(T)
	{
		DstroyTree(T->lchild);
		DstroyTree(T->rchild);
	}
	free(T);
	T = NULL;
}

//交换二叉树的左右子树
void SwapLRchild(ptree root)
{
	ptree temp;
	if(root)
	{
		temp = root->lchild;
		root->lchild = root->rchild;
		root->rchild = temp;
		SwapLRchild(root->lchild);
		SwapLRchild(root->rchild);
	}
}

//给一个节点的值，求解这个节点的父节点
int Parent(ptree root,int e)
{
	if(!root)return 0;
	else if(root)
	{	
		if(root->rchild != NULL && root->lchild->data == e)return root->data;
		if(root->rchild != NULL && root->rchild->data == e)return root->data;
		Parent(root->lchild,e);
		Parent(root->rchild,e);
	}

	return 0;

}

//在二叉树中查找指定的节点
int FindTreeNode(ptree root,int e)
{

	if(root == NULL)return 0;
	if(root->data == e)return e;
	if(FindTreeNode(root->lchild,e) == e)return e;
	else return FindTreeNode(root->rchild,e);

}

int main()
{
	return 0;
}