C语言小知识 --- 数据结构 ---单向循环链表

  之前讲过单向链表，就不多说了哦。

 

代码文件： main.c、singly_link.c、my_singly_link.h

 

首先是 my_singly.h 的代码 

#ifndef MY_SINGLY_LINK_H
#define MY_SINGLY_LINK_H

#include 
#include 

typedef struct MY_LIST
{
	int data;
	struct MY_LIST * Next;

}M_L,*P_M_L;


P_M_L Create_Node();

P_M_L Find_Node(P_M_L Head,int find_data);

int Add_Node(P_M_L Head);

int Display_List(P_M_L Head);

int Del_Node(P_M_L Head);


#endif // MY_SINGLY_LINK_H

 

 接下来是 signly_link.c 的代码

 

#include "my_singly_link.h"

P_M_L Create_Node()
{
	P_M_L Node = (P_M_L) malloc(sizeof(M_L));
	if(Node == NULL) return NULL;

	Node->Next = Node;

	return Node;
}


int Add_Node(P_M_L Head)
{
	if(Head == NULL) return -1;

	P_M_L add_node = Create_Node(); //新建新的结点用来拼接在链表的头节点后面
	if(add_node == NULL) return -1;

	printf("请输入要添加的数据：");
	scanf("%d",&add_node->data);

	add_node->Next = Head->Next;
	Head->Next = add_node;

	return 0;
}


int Display_List(P_M_L Head)
{
	if(Head == NULL || Head->Next == Head) return -1;

	P_M_L new_node = Head->Next;

	for(;new_node != Head; new_node = new_node->Next)
		printf("%d\n",new_node->data);

	return 0;
}


P_M_L Find_Node(P_M_L Head,int find_data)
{
	if(Head == NULL || Head->Next == Head) return NULL;

	P_M_L new_node = Head->Next;

	for(;new_node != Head; new_node = new_node->Next)
		if(new_node->data == find_data)
			return new_node;

	return NULL;
}


int Del_Node(P_M_L Head)
{
	if(Head == NULL || Head->Next == Head) return -1;

	int del_date;
	printf("请输入要删除的数据：");
	scanf("%d",&del_date);

	P_M_L del_node = Find_Node(Head,del_date);
	if(del_node == NULL) return -1;
        
	P_M_L new_node = Head;

	for(; new_node->Next != Head; new_node = new_node->Next)
		if(new_node->Next == del_node)break;

	new_node->Next = del_node->Next;
	del_node->Next = NULL;

	return 0;
}

最后是 main.c 的代码 

#include "my_singly_link.h"

int main()
{
	P_M_L Head = Create_Node();
	if(Head == NULL) printf("创建节点失败 ！\n");

        int add_ret = Add_Node(Head);
        if(add_ret == -1)printf("添加结点失败 ! \n");

	Add_Node(Head);
	Add_Node(Head);
	Add_Node(Head);

        int dis_ret = Display_List(Head);
        if(dis_ret == -1)printf("显示链表数据失败 ！ \n");

	int del_ret = Del_Node(Head);
	if(del_ret == -1)printf("删除失败 ！\n");

	dis_ret = Display_List(Head);
	if(dis_ret == -1)printf("显示链表数据失败 ！ \n");

	return 0;
}