数据结构 - 链表实例 (链式结构)

三个文件：

linklist.h、linklist.c、test02.c

linklist.h

#ifndef _MYLINKLIST_H_
#define _MYLINKLIST_H_

typedef void LinkList;

typedef struct _tag_LinkListNode
{
	struct _tag_LinkListNode* next;
}LinkListNode;


LinkList* LinkList_Create();

void LinkList_Destroy(LinkList* list);
void LinkList_Clear(LinkList* list);
int LinkList_Length(LinkList* list);
int LinkList_Insert(LinkList* list, LinkListNode* node, int pos);
LinkListNode* LinkList_Get(LinkList* list, int pos);
LinkListNode* LinkList_Delete(LinkList* list, int pos);

#endif

linklist.c

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

#include "linklist.h"

typedef struct _tag_LinkList
{
	//这个句柄里面，需要保存所有节点信息。需要有一个起始点
	//就是带头节点的链表。。。
	LinkListNode header;
	int length;
}TLinkList;

LinkList* LinkList_Create()
{
	TLinkList *ret = (TLinkList *)malloc(sizeof(TLinkList));
	if (ret == NULL)
	{
		return NULL;
	}
	//memset(ret, 0, sizeof(TLinkList));
	ret->header.next = NULL;
	ret->length = 0;
	return ret;
}

void LinkList_Destroy(LinkList* list)
{
	if (list == NULL)
	{
		return ;
	}
	free(list);
	return ;
}

void LinkList_Clear(LinkList* list)
{

	TLinkList *tList =NULL;
	
	if (list == NULL)
	{
		return ;
	}
	tList = (TLinkList *)list;
	tList->length = 0;
	tList->header.next = NULL;
	return ;
}

int LinkList_Length(LinkList* list)
{

	TLinkList *tList = (TLinkList *)list;
	if (tList == NULL)
	{
		return -1;
	}

	return tList->length;
}

int LinkList_Insert(LinkList* list, LinkListNode* node, int pos)
{
	int i = 0;

	TLinkList *tList  = NULL;
	LinkListNode *current = NULL;

	tList = (TLinkList *)list;
	//准备环境让辅助指针变量 指向链表头节点
	current = &tList->header;
	for (i=0; i<pos &&(current->next!=NULL); i++)
	{
		current = current->next;
	}

	//让node节点链接后续链表
	node->next = current->next ;
	//让前边的链表。链接node
	current->next = node;
	tList->length ++;	
	return 0;
}

LinkListNode* LinkList_Get(LinkList* list, int pos)
{

	int i = 0;

	TLinkList *tList  = NULL;
	LinkListNode *current = NULL;
	LinkListNode *ret = NULL;
	tList = (TLinkList *)list;

	if (list == NULL || pos <0 ||pos>=tList->length)
	{
		return NULL;
	}
	//准备环境让辅助指针变量 指向链表头节点
	current = &tList->header;
	for (i=0; i<pos &&(current->next!=NULL); i++)
	{
		current = current->next;
	}
	ret = current->next;

	return ret;
}

LinkListNode* LinkList_Delete(LinkList* list, int pos)
{
	int i = 0;

	TLinkList *tList  = NULL;
	LinkListNode *current = NULL;
	LinkListNode *ret = NULL;
	tList = (TLinkList *)list;

	if (list == NULL || pos <0 ||pos>=tList->length)
	{
		return NULL;
	}
	//准备环境让辅助指针变量 指向链表头节点
	current = &tList->header;
	for (i=0; i<pos &&(current->next!=NULL); i++)
	{
		current = current->next;
	}
	ret = current->next;

	//删除算法
	current->next =ret->next;
	tList->length--;

	return ret;
}

test02.c

#include<stdio.h>
#include "stdlib.h"
#include "string.h"
#include "linklist.h"

typedef struct Teacher
{
	LinkListNode node;
	char name[64];
	int age;
}Teacher;

int main()
{
	Teacher		t1,t2, t3;
	int			length, i = 0;

	LinkList		*list = NULL;
	t1.age = 31;
	t2.age = 32;
	t3.age = 33;


	list = LinkList_Create();

	length = LinkList_Length(list);

	LinkList_Insert(list, (LinkListNode *)&t1, LinkList_Length(list));
	LinkList_Insert(list, (LinkListNode *)&t2, LinkList_Length(list));
	LinkList_Insert(list, (LinkListNode *)&t3, LinkList_Length(list));

	//遍历链表 
	for (i=0; i<LinkList_Length(list); i++)
	{
		Teacher *tmp = (Teacher *)LinkList_Get(list, i);
		if (tmp != NULL)
		{
			printf("age:%d ", tmp->age);
		}
	}

	while(LinkList_Length(list) > 0)
	{
		Teacher *tmp = (Teacher *)LinkList_Delete(list, 0);
		if (tmp != NULL)
		{
			printf("age:%d ", tmp->age);
		}
	}
	LinkList_Destroy(list);


	system("pause");

	return 0;
}