1.建立单链表结点

#include<iostream>
using namespace std;
typedef int ElemType;
typedef struct LNode                //建立结点
{
	ElemType data;
	struct LNode* next;
}LinkNode;

2.建立单链表；

void CreateListF(LinkNode*& L, ElemType a[], int n)   //头插法创建单链表
{
	LinkNode* s;
	L = new LinkNode;
	L->next = NULL;
	for (int i = 0;i < n;i++)
	{
		s = new LinkNode;
		s->data = a[i];
		s->next = L->next;
		L->next = s;
	}
}

3.判断链表是否为空

bool ListEmpty(LinkNode* L)    //判断链表是否为空
{
	return(L->next == NULL);
}

4.求链表的长度；

int ListLength(LinkNode* L)    //求链表长度
{
	int n = 0;
	LinkNode* p = L;
	while (p->next != NULL)
	{
		n++;
		p = p->next;
	}
	return n;
}

5.遍历输出链表；

void DispList(LinkNode* L)    //遍历输出链表
{
	LinkNode* p = L->next;
	while (p != NULL)
	{
		cout << p->data << " ";
		p = p->next;
	}
	cout << endl;
}

6.找到链表中某个数的值；

bool GetElem(LinkNode* L, int i, ElemType& e)  //找到链表中某个数的值
{
	int j = 0;
	LinkNode* p = L;
	if (i <= 0)return false;
	while (j < i && p != NULL)
	{
		j++;
		p = p->next;
	}
	if (p == NULL)
	{
		return false;
	}
	else
	{
		e = p->data;
		return true;
	}
}

7.输出单链表中某个值所在的位置；

int LocateElem(LinkNode* L, ElemType e)   //输出链表中某个值所在的位置
{
	int i = 1;
	LinkNode* p = L->next;
	while (p != NULL && p->data != e)
	{
		p = p->next;
		i++;
	}
	if (p == NULL)
		return 0;
	else
		return i;
}

8.插入数据元素；

bool ListInsert(LinkNode*& L, int i, ElemType e)  //插入数据元素
{
	int j = 0;
	LinkNode* p = L, * s;
	if (i <= 0)return false;
	while (j < i - 1 && p != NULL)
	{
		j++;
		p = p->next;
	}
	if (p == NULL)
		return false;
	else
	{
		s = new LinkNode;
		s->data = e;
		s->next = p->next;
		p->next = s;
		return true;
	}
}

9.删除数据元素；

bool ListDelete(LinkNode*& L, int i, ElemType& e)  //删除数据元素
{
	int j = 0;
	LinkNode* p = L, * q;
	if (i <= 0)return false;
	while (j < i - 1 && p != NULL)
	{
		j++;
		p = p->next;
	}
	if (p == NULL)
		return false;
	else
	{
		q = p->next;
		if (q == NULL)
			return false;
		e = q->data;
		p->next = q->next;
		delete q;
		return true;
	}
}

10.销毁链表；

void DestroyList(LinkNode*& L)      //销毁链表
{
	LinkNode* p1 = L, * p2 = L->next;
	while (p2 != NULL)
	{
		delete p1;
		p1 = p2;
		p2 = p1->next;
	}
	delete p1;
}

11.简单测试；

int main()
{
	LinkNode* L;
	ElemType a[10] = { 1,2,3,4,5,6,7,8,9,0 };
	int n = 10;
	CreateListF(L, a, n);
	cout << "链表长度为：" << ListLength(L) << endl;
	cout << "遍历链表：";
	DispList(L);
	ElemType e;
	GetElem(L, 3, e);
	cout << "元素的值为：" << e << endl;
	cout << "数e在链表中的位置为：" << LocateElem(L, e);
	cout << "插入元素：";
	ListInsert(L, 3, e);
	cout << "再次遍历链表：";
	DispList(L);

}