利用二级指针删除单向链表节点

最新推荐文章于 2024-04-19 16:09:27 发布

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最新推荐文章于 2024-04-19 16:09:27 发布

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分类专栏：算法修炼

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本文介绍了一种使用C++实现的链表中删除特定值节点的方法，通过两种不同的二级指针方式实现了节点的删除，并展示了如何创建链表及输出链表节点的过程。

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// testPPointer.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <stdlib.h>

typedef struct tagNode
{
	struct tagNode* m_next;
	int m_nVal;
}Node, *PNode;

// 通过二级指针方式删除节点
void DelNode_Val2(PNode* ppHead, int nVal);
void DelNode_Val2(PNode* ppHead, int nVal)
{
	 for (PNode* ppCurr = ppHead; *ppCurr != NULL;)
	 {
		 PNode pEntry = *ppCurr;
		 if (pEntry->m_nVal == nVal)
		 {
			*ppCurr = pEntry->m_next;
			free(pEntry);
		 }
		 else
		 {
			ppCurr = &pEntry->m_next;
		 }
	 }
}

void DelNode_Val(PNode* ppHead, int nVal);
void DelNode_Val(PNode* ppHead, int nVal)
{
	for (PNode pPre = NULL, pCurr = *ppHead; pCurr != NULL;)
	{
		PNode pNext = pCurr->m_next;
		if (pCurr->m_nVal == nVal)
		{
			if (pPre == NULL)
			{
				*ppHead = pNext;
			}
			else
			{
				pPre->m_next = pNext;
			}
			free(pCurr);
		}
		else
		{
			pPre = pCurr;
		}
		
		pCurr = pNext;
	}
}

void OutPut(PNode pHead);
void OutPut(PNode pHead)
{
	for (PNode pCurr = pHead; pCurr != NULL; pCurr = pCurr->m_next)
	{
		printf("address:%d, val:%d\r\n", pCurr, pCurr->m_nVal);
	}
}

int _tmain(int argc, _TCHAR* argv[])
{
	PNode pnode1 = (PNode)malloc(sizeof(Node));
	pnode1->m_nVal = 1;

	PNode pnode2 = (PNode)malloc(sizeof(Node));
	pnode2->m_nVal = 2;

	PNode pnode3 = (PNode)malloc(sizeof(Node));
	pnode3->m_nVal = 3;

	PNode pnode4 = (PNode)malloc(sizeof(Node));
	pnode4->m_nVal = 4;

	PNode pnode5 = (PNode)malloc(sizeof(Node));
	pnode5->m_nVal = 5;

	PNode pnode6 = (PNode)malloc(sizeof(Node));
	pnode6->m_nVal = 6;

	pnode1->m_next = pnode2;
	pnode2->m_next = pnode3;
	pnode3->m_next = pnode4;
	pnode4->m_next = pnode5;
	pnode5->m_next = pnode6;
	pnode6->m_next = NULL;

	PNode pHead = pnode1;
	OutPut(pHead);
	
	printf("*******************************\r\n");
	DelNode_Val(&pHead, 3);
	OutPut(pHead);

	printf("*******************************\r\n");
	DelNode_Val2(&pHead, 4);
	OutPut(pHead);
	

	return 0;
}