C语言实现二叉树的基本操作---创建、遍历、求深度、求叶子结点

#include <stdio.h>

#include <stdlib.h>

#include <malloc.h>

typedef int
 ElemType; //数据类型

//定义二叉树结构，与单链表相似，多了一个右孩子结点

typedef struct BiTNode{
ElemType
 data; //数据域
struct BiTNode*lChild, *rChlid;
//左右子树域

}BiTNode, *BiTree;

//先序创建二叉树

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("输入%d的左子节点：", ch);
CreateBiTree(&(*T)->lChild);
printf("输入%d的右子节点：", ch);
CreateBiTree(&(*T)->rChlid);
}

return 1;

}

//先序遍历二叉树

void TraverseBiTree(BiTree T)

{
if (T == NULL)
return ;
printf("%d ", T->data);
TraverseBiTree(T->lChild);
TraverseBiTree(T->rChlid);

}

//中序遍历二叉树

void InOrderBiTree(BiTree T)

{
if (T == NULL)
return ;
InOrderBiTree(T->lChild);
printf("%d ", T->data);
InOrderBiTree(T->rChlid);

}

//后序遍历二叉树

void PostOrderBiTree(BiTree T)

{
if (T == NULL)
return ;
PostOrderBiTree(T->lChild);
PostOrderBiTree(T->rChlid);
printf("%d ", T->data);

}

//二叉树的深度

int TreeDeep(BiTree T)

{
int deep = 0;
if(T)
{
int leftdeep = TreeDeep(T->lChild);
int rightdeep = TreeDeep(T->rChlid);
deep = leftdeep>=rightdeep?leftdeep+1:rightdeep+1;
}
return deep;

}

//求二叉树叶子结点个数

int Leafcount(BiTree T,int &num)

{  
if(T)
{
if(T->lChild ==NULL &&T->rChlid==NULL)
num++;
Leafcount(T->lChild,num);
Leafcount(T->rChlid,num);

}
return num;

}

//主函数

int main(void)

{
BiTree T;
BiTree *p = (BiTree*)malloc(sizeof(BiTree));
int deepth,num=0 ;
printf("请输入第一个结点的值,-1表示没有叶结点:\n");
CreateBiTree(&T);
printf("先序遍历二叉树:\n");
TraverseBiTree(T);
printf("\n");
printf("中序遍历二叉树:\n");
InOrderBiTree(T);
printf("\n");
printf("后序遍历二叉树:\n");
PostOrderBiTree(T);
printf("\n");
deepth=TreeDeep(T);
printf("树的深度为:%d",deepth);
printf("\n");
Leafcount(T,num);
printf("树的叶子结点个数为:%d",num);
printf("\n");
return 0;

}

文章摘自 http://blog.csdn.net/woailvmengmeng/article/details/20546797?utm_source=tuicool&utm_medium=referral