数据结构C——单链表

//单链表，上课写的，比较简单的操作。链表的创建，删除，插入，查找元素，遍历的简单操作。2017-3-7

#include<stdio.h>
#include<stdlib.h>
#define OK 1
#define ERROR 0

typedef int ElemType;

typedef int Status; 

typedef struct LNode
{
	ElemType data;
	struct LNode *next;
}LNode,*LinkList;

//函数定义........................................................
LinkList CreatList(int n);

void ShowNumber(LinkList haed);

Status GetElem(LinkList L,int i,ElemType &e);

Status ListInsert(LinkList &L,int i,ElemType e);

Status NumbersLen(LinkList L);
//实现部分........................................................
LinkList CreatList(int n)
{
	LinkList p,q;
	LinkList head;
	head = (LinkList)malloc(sizeof(LNode));
	head->next = NULL;
	q = head;
	printf("请输入数据\n");
	for(int i=0;i<n;i++)
	{	
		p = (LinkList)malloc(sizeof(LNode));
		 p->next=NULL;
		scanf("%d",&p->data);
		q->next = p;
		q=q->next;
	}
	return head;

}

void ShowNumber(LinkList head)
{
	LinkList p;
	p = head->next;
	printf("输出所有数据:\n");
	while(p)
	{
		
		printf("%-4d",p->data);
		p=p->next;
	}
	printf("\n");
}

Status GetElem(LinkList L,int i,ElemType &e)
{
	LinkList p;
	int j =1;
	p = L->next;
	while(p && j<i)
	{
		p = p->next;
		j++;
	}
	if(!p || j>i)
		return ERROR;
	e = p->data;
	return OK;
}

Status LinkInsert(LinkList &L,int i,ElemType e)
{
	LinkList p;
	LinkList q;
	p = L->next;
	int j=1;
	while(p && j<i-1)
	{
		p = p->next;
		j++;
	}
	if(!p || j>i)
		return ERROR;
	q = (LinkList)malloc(sizeof(LNode));
	q->data = e;
	q->next = p->next;
	p->next = q;

	return OK;
}

Status NumbersLen(LinkList L)
{
	LinkList p;
	int count = 0;
	p = L->next;
	while(p)
	{
		count++;
		p=p->next;
	}
	if(count)
	{
		printf("链表的长度为:%d\n",count);
		return OK;}
		
	else
	{
		printf("链表为空！\n");
		return ERROR;
	}
	
	
}

//驱动函数..................................................................
int main()
{
	int n;
	int e;
	int i;
//	int count;
	LinkList head;
	printf("输入元素个数:\n");
	scanf("%d",&n);
	head =CreatList(n);

	ShowNumber(head);

	printf("请输入查找第几个元素:\n");
	scanf("%d",&i);
	GetElem(head,i,e);
	printf("查找的元素是: %d\n",e);

	printf("请输入在第几个元素前插入元素：\n");
	scanf("%d",&i);
	printf("请输入插入的元素:\n");
	scanf("%d",&e);
	if(LinkInsert(head,i,e))
		printf("插入成功\n");
	else
		printf("插入失败\n");

	ShowNumber(head);

	NumbersLen(head);

	return 0;

}