实例代码：
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#include <stdlib.h>
#include <stdio.h>
#include <malloc.h>
typedef struct Node{
struct Node *pNext;
int data;
struct Node *prior;
} NODE,*PNODE;
PNODE CreatList();
void TreNode(PNODE pHead);
bool isEmpty(PNODE pHead);
int getCount(PNODE pHead);
bool insertNode (PNODE pHead,int pos,int val);
bool detNode (PNODE pHead,int pos,int *pVal);
void sort(PNODE pHead);
int main(){
int val;
PNODE pHead = NULL;
pHead = CreatList();
TreNode(pHead);
printf("链表不为空！\\n");
printf("链表不为空！\\n");
if(insertNode(pHead, 4, 7))
printf("插入成功!插入的元素为：%d\\n", 7);
else
printf("插入失败!\\n");
//重新遍历链表
TreNode(pHead);
//删除元素测试
if(detNode(pHead, 3, &val))
printf("元素删除成功!删除的元素是：%d\\n", val);
else
printf("元素删除失败!\\n");
TreNode(pHead);
return 0 ;
}
PNODE CreatList(){
int i ;
int val;
int length;
PNODE pHead = (PNODE)malloc(sizeof(NODE));
if(NULL==pHead)
{
printf("创建链表失败！\\n");
exit(-1);
}
pHead->pNext = NULL;
pHead->prior = NULL;
PNODE pTail = pHead;
printf("请输入您想要创建链表结点的个数：len = ");
scanf("%d", &length);
for(i = 0;i < length;i++){
printf("请输入第%d个结点的值：", i+1);
scanf("%d", &val);
PNODE pnew = (PNODE)malloc(sizeof(NODE));
if(NULL==pHead)
{
printf("创建链表失败！\\n");
exit(-1);
}
pnew->data = val;
// pTail->pNext = pnew;
pTail->pNext = pnew;
pnew->prior = pTail;
pnew->pNext = pHead;
pHead->prior = pnew;
pTail = pnew;
}
return pHead;
}
void TreNode(PNODE pHead){
PNODE p = pHead->pNext;
while(p!= pHead ){
printf("%d",p->data);
p = p->pNext;
}
printf("\\n");
return ;
}
bool isEmpty(PNODE pHead){
if(NULL==pHead->pNext)
return true;
else
return false;
}
int getCount(PNODE pHead)
{
int i =0 ;
PNODE p = pHead->pNext;
while(NULL != p){
p = p->pNext;
i++;
}
return i ;
}
bool insertNode (PNODE pHead,int pos,int val){
int i = 0;
// PNODE p = pHead;
PNODE p =pHead;
while(NULL !=p && i<pos-1){
p = p->pNext;
i++;
}
if(NULL == p || i>pos-1)
{
return false;
}
scanf("%d", &val);
PNODE pNew = (PNODE)malloc(sizeof(NODE));
if(NULL==pNew)
{
printf("创建链表失败！\\n");
exit(-1);
}
pNew ->data = val;
PNODE q = p->pNext;
p->pNext = pNew;
pNew->prior = p;
pNew->pNext = q;
return true;
}
bool detNode (PNODE pHead,int pos,int *pVal){
int i = 0;
// PNODE p = pHead;
PNODE p = pHead;
while(NULL !=p && i<pos-1){
p = p->pNext;
i++;
}
if(NULL == p || i>pos-1)
{
return false;
}
*pVal = p->pNext->data;
PNODE q = p->pNext;
p->pNext = p->pNext->pNext;
free(q);
q = NULL;
return true;
}
void sort(PNODE pHead){
int i,j,k,t;
k = getCount(pHead);
PNODE p,q;
for(i = 0,p=pHead->pNext;i < k-1;i++,p = p->pNext)
{
for(j = i+1,q = p->pNext;j<k;j++,q = q->pNext){
if(p->data > q->data ){
t = p->data;
p->data = q->data;
q->data = t;
}
}
}
}
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实现效果：
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