数据结构 C语言实现循环单链表的实例

数据结构 C语言实现循环单链表的实例

实例代码：

//=========杨鑫========================//
//循环单链表的实现
#include <stdio.h>
#include <stdlib.h> 

typedef int ElemType;
//定义结点类型
typedef struct Node
{
  ElemType data;
  struct Node *next;
}Node,*LinkedList;
int count = 0; 

//1、单循环链表的初始化
LinkedList init_circular_linkedlist()
{
  Node *L;
  L = (Node *)malloc(sizeof(Node));
  if(L == NULL)
    printf("申请内存空间失败\n");
  L->next = L;
} 

//2、循环单链表的建立
LinkedList creat_circular_linkedlist()
{
  Node *L;
  L = (Node *)malloc(sizeof(Node));
  L->next = L;
  Node *r;
  r = L;
  ElemType x;
  while(scanf("%d",&x))
  {
    if(x == 0)
      break;
    count++;
    Node *p;
    p = (Node *)malloc(sizeof(Node));
    p->data = x;
    r->next = p;
    r = p;
  }
  r->next = L;
  return L;
} 

//4、循环单链表的插入，在循环链表的第i个位置插入x的元素
LinkedList insert_circuler_linkedlist(LinkedList L,int i,ElemType x)
{
  Node *pre;
  pre = L;
  int tempi = 0;
  for (tempi = 1; tempi < i; tempi++)
    pre = pre->next;
  Node *p;
  p = (Node *)malloc(sizeof(Node));
  p->data = x;
  p->next = pre->next;
  pre->next = p;
  return L;
}  

//5、循环单链表的删除，在循环链表中删除值为x的元素
LinkedList delete_circular_linkedlist(LinkedList L,ElemType x)
{
  Node *p,*pre;
  p = L->next;
  while(p->data != x)
  {
    pre = p;
    p = p->next;
  }
  pre->next = p->next;
  free(p);
  return L;
}  

int main()
{
  int i;
  LinkedList list, start;
  printf("请输入循环单链表的数据, 以0结束！\n");
  list = creat_circular_linkedlist();
  printf("循环单链表的元素有：\n");
  for(start = list->next; start != NULL; start = start->next)
  {
    if(count== 0)
    {
        break;
    }
    printf("%d ", start->data);
    count--;
  } 

  printf("\n");
  return 0;
}

如图：

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