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双向链表操作-简单

源程序:

#include <stdio.h>

#include <stdlib.h>

//双向链表结点的定义

typedef struct dbnode

{

  int data;

  struct dbnode *prio, *next;

}DbNode, linkdblist;

 //创建双向链表

 DbNode *creatlist(void)

 {

  linkdblist *p, *q, *head;

  q = p = (linkdblist *)malloc(sizeof(linkdblist));

  p->next = NULL;

  head = q;

  p = (linkdblist *)malloc(sizeof(linkdblist));

  scanf("%d", &p->data);

  while (p->data != -1)

  {

    q->next = p;

    p->prio = q;

    q = p;

    p = (linkdblist *)malloc(sizeof(linkdblist));

    scanf("%d", &p->data);

  }

  q->next = NULL;

   return head;

}

//输出双向链表

 void print(linkdblist *head)

{

  linkdblist *p;

   p = head->next;

  if (p == NULL) 

  printf("空链表!\n");

  while (p != NULL) 

  {

    printf("%d  ", p->data);

    p = p->next;

  }

//向双向链表中的第i个位置插入一个结点x

 void insertdblist(linkdblist *head, int x, int i)

{

  linkdblist *p, *q = head;

  if (i == 1) 

    q = head;

  else

  {

    q = q->next;

     int c = 1;   

    while ((c<i - 1) && (q != NULL))

    {

       q = q->next;

       c++;

     }

  }

  if (q != NULL && q->next != NULL) 

  {

    p = (linkdblist *)malloc(sizeof(linkdblist));

    p->data = x;

    p->prio = q;

     p->next = q->next;

    q->next = p;

    q->next->prio = p;

  }

  else

    printf("找不到插入的位置!");

}

//删除双向链表中指定位置上的一个结点

void deletelinkdblist(linkdblist *head, int i)

{

  linkdblist *p, *q = head;

  if (i == 1)

    q = head;

  else

  {

    q = q->next;

    int c = 1; 

    while (c < i - 1 && q != NULL) 

    { 

      q = q->next;

      c++ ;

    }

  }

  if (q != NULL && q->next != NULL)

  {

    p = q->next;

    p->prio = q;

    p->prio->next = p->next;

    p->next->prio = p->prio; 

    free(p);

  }

  else if (q->next == NULL)

  { 

    p = q;

     p->prio->next = NULL;

    free(p);

  }

  else

    printf("没有找到待删除的结点");

}

 

//双向链表的主函数

 

void main()

  linkdblist *head; 

  head = creatlist(); 

  print(head);

  printf("\n\n====向双向链表的某位置插入一个值====\n");

  int num, i;

  printf("输入插入的位置:");

  scanf("%d", &i);

  printf("\n输入插入的值:"); 

  scanf("%d", &num); 

  insertdblist(head, num, i);

  print(head); 

  printf("\n");

  printf("\n\n====删除双向链表的某位置上的一个值====\n"); 

  int j;

   printf("输入删除的位置:");

  scanf("%d", &j);

   deletelinkdblist(head, j);

  print(head); 

  system("pause");

  printf("\n");

}


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