#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
 
typedef int ElemType;//數(shù)據(jù)類型
//定義二叉樹結構，與單鏈表相似，多了一個右孩子結點
typedef struct BiTNode
{
 ElemType data;
 struct BiTNode *lChild,*rChild;
}BiTNode,*BiTree;
 
//先序創(chuàng)建二叉樹
int CreateBiTree(BiTree *T)
{
 ElemType ch;
 ElemType temp;
 scanf("%d",&ch);
 temp=getchar();
 if(ch==-1)
 {
 *T=NULL;
 }
 else
 {
 *T=(BiTree)malloc(sizeof(BiTNode));
 if(!(*T))
 {
 exit(-1);
 }
 (*T)->data=ch;
 printf("輸入%d的左子結點：",ch);
 CreateBiTree(&(*T)->lChild);
 printf("輸入%d的右子結點：",ch);
 CreateBiTree(&(*T)->rChild);
 }
 return 1;
}
 
//先序遍歷二叉樹
void TraverseBiTree(BiTree T)
{
 if(T==NULL)
 {
 return;
 }
 printf("%d",T->data);
 TraverseBiTree(T->lChild);
 TraverseBiTree(T->rChild);
}
 
//中序遍歷二叉樹
void InOrderBiTree(BiTree T)
{
 if(T==NULL)
 {
 return;
 }
 InOrderBiTree(T->lChild);
 printf("%d",T->data);
 InOrderBiTree(T->rChild);
}
 
//后序遍歷二叉樹
void PostOrderBiTree(BiTree T)
{
 if(T==NULL)
 {
 return;
 }
 PostOrderBiTree(T->lChild);
 PostOrderBiTree(T->rChild);
 printf("%d",T->data);
}
 
//二叉樹的深度
int TreeDeep(BiTree T)
{
 int deep=0;
 if(T)
 {
 int leftdeep=TreeDeep(T->lChild);
 int rightdeep=TreeDeep(T->rChild);
 deep=leftdeep>=rightdeep?leftdeep+1:rightdeep+1;
 }
 return deep;
}
 
//求二叉樹葉子結點個數(shù)
int Leafcount(BiTree T,int &num)
{
 if(T)
 {
 if(T->lChild==NULL&&T->rChild==NULL)
 {
 num++;
 }
 Leafcount(T->lChild,num);
 Leafcount(T->rChild,num);
 }
 return num;
}
 
//主函數(shù)
int main(void)
{
 BiTree T;
 BiTree *p=(BiTree *)malloc(sizeof(BiTree));
 int deepth,num=0;
 printf("請輸入第一個結點的值，-1表示沒有葉結點：\n");
 CreateBiTree(&T);
 printf("先序遍歷二叉樹：\n");
 TraverseBiTree(T);
 printf("\n");
 printf("中序遍歷二叉樹：\n");
 InOrderBiTree(T);
 printf("\n");
 printf("后序遍歷二叉樹：\n");
 PostOrderBiTree(T);
 printf("\n");
 deepth=TreeDeep(T);
 printf("數(shù)的深度為：%d",deepth);
 printf("\n");
 Leafcount(T,num);
 printf("數(shù)的葉子結點個數(shù)為：%d",num);
 printf("\n");
 return 0;
}