#include <stdio.h>
#include <stdlib.h>
typedef int ElemType;
typedef struct dlnode
{
	ElemType data;
	struct dlnode *prior,*next;
}DLNode,*DLinkList;
void CreateDLinkList(DLinkList &DL) //创建双向链表
{
	int i,num;
	DLinkList p,s;
	DL = (DLNode *)malloc(sizeof(DLNode));
	DL->prior = DL->next = NULL;
	p = DL;
	printf("请输入双向链表结点数：");
	scanf("%d",&num);
	for(i = 1;i <= num; i++)	//顺序创建链表 
	{
		s = (DLinkList)malloc(sizeof(DLNode));
		s->data = i;
		s->next = p->next;
		s->prior = p;
		p->next = s;
		p = s;
	} 
}
void Traverse(DLinkList DL)  //遍历
{
	DLinkList p = DL->next;
	while(p)
	{
		if(p->next)
		    printf("%3d <==>",p->data);
		else
		    printf("%3d",p->data);
		p = p->next;
	}
} 
int main()
{
	DLinkList DL;
	CreateDLinkList(DL);
	printf("\n双向链表值为：");
	Traverse(DL);
	printf("\n\n\n"); 
	system("pause");
}