循环双链表的操作

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CLinkList.h

#pragma once
#include<stdio.h>
#include<malloc.h>

#define DataType int

typedef struct CLNode
{
	DataType data;
	struct CLNode* next;
}CLNode,*CLinkList;

void InitCLinkList(CLinkList* head);

int InsertElem(CLinkList head, int i, DataType e);

int DeleteElem(CLinkList head, int i, DataType* e);

void InsertElemR(CLinkList head, DataType e);

void InsertElemF(CLinkList head, DataType e);

CLinkList.cpp

#include "CLinkList.h"

#define _CRT_SECURE_NO_WARNINGS 1

void InitCLinkList(CLinkList* head)
{
	(*head) = (CLinkList)malloc(sizeof(CLNode));
	(*head)->next = *head;
}

int InsertElem(CLinkList head, int i, DataType e)
{
	CLNode* pre, * p;
	if (i <= 0)
	{
		printf("插入位置错误！\n");
		return -1;
	}
	int j;
	pre = head;
	j = 0;
	while (pre->next != head && j < i - 1)
	{
		pre = pre->next;
		j++;
	}
	if (j != i - 1)
	{
		printf("插入位置错误！\n");
		return 0;
	}
	p = (CLNode*)malloc(sizeof(CLNode));
	p->data = e;
	p->next = pre->next;
	pre->next = p;
	return 1;
}

int DeleteElem(CLinkList head, int i, DataType* e)
{
	CLNode* pre, *p;
	int j;
	if (i <= 0)
	{
		printf("删除位置错误！\n");
		return -1;
	}
	pre = head;
	j = 0;
	while (pre->next!= head &&j < i - 1)
	{
		pre = pre->next;
		j++;
	}
	if (j != i - 1)
	{
		printf("删除位置错误！\n");
		return 0;
	}
	p = pre->next;
	*e = p->data;
	pre->next = p->next;
	free(p);
	return 1;
}

void InsertElemR(CLinkList head, DataType e)
{
	CLNode* pre, * p;
	pre = head;
	while (pre->next != head)
	{
		pre = pre->next;
	}
	p = (CLNode*)malloc(sizeof(CLNode));
	p->data = e;
	p->next = pre->next;
	pre->next = p;
}

void InsertElemF(CLinkList head, DataType e)
{
	CLNode* p;
	p = (CLNode*)malloc(sizeof(CLNode));
	p->data = e;
	p->next = head->next;
	head->next = p;
}