二叉树遍历-C语言实现

最新推荐文章于 2025-05-16 11:57:26 发布

原创最新推荐文章于 2025-05-16 11:57:26 发布 · 4k 阅读

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#数据结构

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本文介绍了一种链式二叉树的数据结构，并通过递归方式实现了前序、中序和后序遍历。文章详细展示了二叉树节点的创建过程及遍历算法的具体实现。

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#include <stdio.h> //链式二叉树递归遍历完成
#include <malloc.h>
#include <stdlib.h>
#include <stdbool.h>
typedef struct BTNode
{
    int data;
    struct BTNode *pLchild; //左孩子
    struct BTNode *pRchild; //右孩子
};
void PreTraverseBTree(struct BTNode *);
struct BTNode *CreateBTree(void);
void InTraverseBTree(struct BTNode *);
void PostTraverseBTree(struct BTNode *);
int main(void)
{
    struct BTNode *pT = CreateBTree();
   // PreTraverseBTree(pT);
   // InTraverseBTree(pT);
    PostTraverseBTree(pT);
    return 0;
}
void PreTraverseBTree(struct BTNode *pT)
{
    if (NULL != pT)
    {
        printf("%c\n", pT->data);
        if (NULL != pT->pLchild)
        {
            PreTraverseBTree(pT->pLchild);
        }
        
        if (NULL != pT->pRchild)
        {
            PreTraverseBTree(pT->pRchild);
        }
    }
}
void InTraverseBTree(struct BTNode *pT)
{
    if (NULL != pT)
    {  
        if (NULL != pT->pLchild)
        {
            InTraverseBTree(pT->pLchild);
        }
        printf("%c\n", pT->data);
        if (NULL != pT->pRchild)
        {
            InTraverseBTree(pT->pRchild);
        }
    }
}
void PostTraverseBTree(struct BTNode *pT)
{
    if (NULL != pT)
    {
        if (NULL != pT->pLchild)
        {
            PostTraverseBTree(pT->pLchild);
        }
        if (NULL != pT->pRchild)
        {
            PostTraverseBTree(pT->pRchild);
        }
        printf("%c\n", pT->data);
    }
}
struct BTNode *CreateBTree(void)
{
    struct BTNode *pA = (struct BTNode *)malloc(sizeof(struct BTNode));
    struct BTNode *pB = (struct BTNode *)malloc(sizeof(struct BTNode));
    struct BTNode *pC = (struct BTNode *)malloc(sizeof(struct BTNode));
    struct BTNode *pD = (struct BTNode *)malloc(sizeof(struct BTNode));
    struct BTNode *pE = (struct BTNode *)malloc(sizeof(struct BTNode));
    //struct BTNode *pA =(struct BTNode *)malloc(sizeof (struct BTNode));
    pA->data = 'A';
    pB->data = 'B';
    pC->data = 'C';
    pD->data = 'D';
    pE->data = 'E';
    pA->pLchild = pB;
    pA->pRchild = pC;
    pB->pLchild = pB->pRchild = NULL;
    pC->pLchild = pD;
    pC->pRchild = NULL;
    pD->pLchild = NULL;
    pD->pRchild = pE;
    pE->pLchild = pE->pRchild = NULL;
    return pA;
};