数据结构（C语言）：单链表的创建、插入、修改、删除、查找、修改等操作

.h头文件

#ifndef _LINK_H_
#define _LINK_H_

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


/*数据域数据类型*/
typedef int DateType;

/*结点数据类型*/
typedef struct node
{
	DateType data;//数据域
	struct node *pNext;//指针域
}LinkNode;

//标签数据类型
typedef struct list
{
	LinkNode *pHead;//头结点指针
	int cLen;//当前链表结点个数
}LinkList;

#endif

.c文件

#include "link.h"

/*创建空链表*/
LinkList* createLinkList()
{
	LinkList *pList = malloc(sizeof(LinkList));
	if(NULL == pList)
	{
		perror("fail to malloc");
		return NULL;
	}
	pList->pHead = NULL;
	pList->cLen = 0;

	return pList;	
}

/*遍历打印链表*/
void showForEachList(LinkList *pList)
{
	LinkNode *pTmpNode = pList->pHead;

	while(pTmpNode != NULL)
	{
		printf("%d ",pTmpNode->data);
		pTmpNode = pTmpNode->pNext;
	}
	printf("\n");
}

/*判断链表是否为空*/
int isEmptyLinkList(LinkList *pList)
{
	return pList->cLen == 0;
}

/*头插*/
int insertHeadLinkList(LinkList *pList,DateType data)
{
	LinkNode *pInsertNode = malloc(sizeof(LinkNode));
	if(NULL == pInsertNode)
	{
		perror("insertHeadLinkList malloc error!\n");
		return 1;
	}
	pInsertNode->data = data;

	pInsertNode->pNext = pList->pHead;
	pList->pHead = pInsertNode;
	pList->cLen++;
	
	return 0;
}

/*尾插*/
int insertTailLinkList(LinkList *pList,DateType data)
{
	LinkNode *pInsertNode = malloc(sizeof(LinkNode));
	if(NULL == pInsertNode)
	{
		perror("insertTailLinkList malloc error!\n");
		return 1;
	}
	pInsertNode->data = data;
	pInsertNode->pNext = NULL;

	
	if(NULL == pList->pHead)
	{
		pList->pHead = pInsertNode;
	}
	else
	{
		LinkNode *pTmpNode = pList->pHead;
		while(pTmpNode->pNext != NULL)
		{
			pTmpNode = pTmpNode->pNext;
		}
		pTmpNode->pNext = pInsertNode;
	}
	pList->cLen++;

	return 0;
}

/*头删*/
int deleteHeadLinkList(LinkList *pList)
{
	if(isEmptyLinkList(pList))
	{
		return 0;
	}
	LinkNode *pTmpNode = pList->pHead;
	pList->pHead = pTmpNode->pNext;
	free(pTmpNode);
	pList->cLen--;

	return 0;
}

/*尾删*/
int deleteTailLinkList(LinkList *pList)
{
	if(isEmptyLinkList(pList))
	{
		return 0;
	}
	else if(1 == pList->cLen)
	{
		deleteHeadLinkList(pList);
	}
	else
	{
		LinkNode *pTmpNode = pList->pHead;
		while(pTmpNode->pNext->pNext != NULL)
		{
			pTmpNode = pTmpNode->pNext;
		}
		free(pTmpNode->pNext);
		pTmpNode->pNext = NULL;
		pList->cLen--;
	}

	return 0;
}

/*查找*/
LinkNode *findLinkList(LinkList *pList,DateType data)
{
	
	LinkNode *pTmpNode = pList->pHead;
	while(pTmpNode != NULL)
	{
		if(data == pTmpNode->data)
		{
			return pTmpNode;
		}
		pTmpNode = pTmpNode->pNext;
	}

	return NULL;
}

/*修改*/
int changeLinkList(LinkList *pList,DateType oldData,DateType newData)
{
	LinkNode *pTmpNode = NULL;
	while((pTmpNode = findLinkList(pList,oldData)) != NULL)
	{
		pTmpNode->data = newData;
	}

	return 0;
}

/*链表销毁*/
void destroyLinkList(LinkList **ppList)
{
	while((*ppList)->pHead !=NULL)
	{
		deleteHeadLinkList(*ppList);
	}
	free(*ppList);
	*ppList = NULL;
}

/*查找中间结点，不知道结点数*/
LinkNode *findMidNode(LinkList *pList)
{
	LinkNode *pFast = pList->pHead;
	LinkNode *pSlow = pList->pHead;

	while(pFast != NULL)
	{
		pFast = pFast->pNext;
		if(NULL == pFast)
		{
			break;
		}
		pFast = pFast->pNext;
		pSlow = pSlow->pNext;
	}
	return pSlow;
}

/*查找链表中第K个结点（不知道结点数）*/
LinkNode *findLastKNode(LinkList *pList ,int K)
{
	LinkNode *pFast = pList->pHead;
	LinkNode *pSLow = pList->pHead;
	int i = 0;
	for (i = 0; i < K; i++)
	{
		pFast = pFast->pNext;
	}
	while (pFast != NULL)
	{
		pFast = pFast->pNext;
		pSLow = pSLow->pNext;
	}
	return pSLow;
}

/*链表逆序*/
void reverseLinkList(LinkList *pList)
{
	LinkNode *pTmpNode = pList->pHead;
	LinkNode *pInsertNode = NULL;

	pList->pHead = NULL;

	while (pTmpNode != NULL)
	{
		pInsertNode = pTmpNode;
		pTmpNode = pTmpNode->pNext;

		pInsertNode->pNext = pList->pHead;
		pList->pHead = pInsertNode;
	}
}

/*删除链表中指定结点*/
int deletePointNode(LinkList *pList,DateType data)
{
	LinkNode *pTmpNode = pList->pHead;
	LinkNode *pPreNode = pList->pHead;

	while (pTmpNode != NULL)
	{
		if (pTmpNode->data == data)
		{
			if (pTmpNode == pPreNode)
			{
				pList->pHead = pTmpNode->pNext;
				free(pTmpNode);
				pTmpNode = pList->pHead;
				pPreNode = pList->pHead;
			}
			else
			{
				pPreNode->pNext = pTmpNode->pNext;
				free(pTmpNode);
				pTmpNode = pPreNode->pNext;
			}
			pList->cLen--;
		}
		else
		{
			pPreNode = pTmpNode;
			pTmpNode = pTmpNode->pNext;
		}
	}
}

/*创建环型链表*/
LinkList *loopLinkList(LinkList *pList)
{
	LinkNode *pTmpNode = pList->pHead;
	while(pTmpNode->pNext != NULL)
	{
		pTmpNode = pTmpNode->pNext;
	}
	pTmpNode->pNext = pList->pHead;//首尾环

	return pList;
}

/*判断链表是否有环*/
int isloopLinkList(LinkList *pList)
{
	LinkNode *pFast = pList->pHead;
	LinkNode *pSlow = pList->pHead;
	while(1)
	{
		pFast = pFast->pNext;
		if(NULL == pFast)
		{
			return 0;//无环
		}
		if(pFast->data == pSlow->data)
		{
			return 1;//有环
		}

		pFast = pFast->pNext;
		if(NULL == pFast)
		{
			return 0;
		}

		pSlow = pSlow->pNext;

		if(pFast->data == pSlow->data)
		{
			return 1;
		}
	}
}

/*约瑟夫环*/
LinkNode *deleteJosephNode(LinkList *pList)
{
	LinkNode *pPreNode = pList->pHead;
	LinkNode *pFreeNode = pList->pHead;
	while(pList->cLen > 1)
	{
		pPreNode = pPreNode->pNext;
		pFreeNode = pFreeNode->pNext->pNext;
		pPreNode->pNext = pFreeNode->pNext;
		free(pFreeNode);
		pList->cLen--;
		pFreeNode = pPreNode->pNext;
		pPreNode =pFreeNode;	
	}

	return pPreNode;
}

/*链表的插入排序*/
void insertSortLinkList(LinkList *pList)
{
	if(isEmptyLinkList(pList) || 1 == pList->cLen)
	{
		return ;
	}
	LinkNode *pInsertNode = NULL;
	LinkNode *pTmpNode = pList->pHead->pNext;
	pList->pHead->pNext = NULL;//从第一个结点后断开链表

	while(pTmpNode != NULL)
	{
		/*拿到要插入的结点*/
		pInsertNode = pTmpNode;
		pTmpNode = pTmpNode->pNext;
		pInsertNode->pNext = NULL;

		/*当要插入的结点为头结点时*/
		if(pInsertNode->data < pList->pHead->data)
		{
			pInsertNode->pNext = pList->pHead;
			pList->pHead = pInsertNode;
		}
		else
		{
			/*寻找非头结点插入的位置*/
			LinkNode *pTmp = pList->pHead;
			while(pTmp != NULL && pTmp->pNext != NULL && pInsertNode->data > pTmp->data)
			{
				pTmp = pTmp->pNext;
			}
			/*结点插入*/
			pInsertNode->pNext = pTmp->pNext;
			pTmp->pNext = pInsertNode;
		}		
	}
}

int main(void)
{
	LinkList *pList = NULL;
	LinkNode *pTmpNode = NULL;
	pList = createLinkList();
	
	int i = 0;
	for(i = 1;i < 10;i++)
	{
		insertHeadLinkList(pList,i);
	}
	showForEachList(pList);
/*
	loopLinkList(pList);
	printf("%d\n",isloopLinkList(pList));

	printf("%d\n",deleteJosephNode(pList)->data);	
*/
	insertSortLinkList(pList);
	showForEachList(pList);

	return 0;
}