单链表的基本操作（CC++）

单链表的基本操作：定义、头插法、尾插法、插入节点、删除节点、按值查找、按位查找、打印单链表

#include
#include

using namespace std;

//定义单链表
typedef struct LNode{
	int data;
	struct LNode *next;
}LNode,*LinkList;

//头插法建立单链表
LinkList List_HeadInsert(LinkList &L) {
	int x;
	LNode* s;
	L = (LinkList)malloc(sizeof(LNode));
	L->next = NULL;
	cout << "请输入:(输入9999结束)" << endl;
	cin >> x;
	while (x!=9999) {
		s = (LNode*)malloc(sizeof(LNode));
		s->data = x;
		s->next = L->next;
		L->next = s;
		cin >> x;
	}
	return L;
}

//尾插法建立单链表
LinkList List_TailInsert(LinkList &L) {
	int x;
	L = (LinkList)malloc(sizeof(LNode));
	LNode *s,*r=L;
	cout << "请输入:(输入9999结束)" << endl;
	cin >> x;
	while (x != 9999) {
		s = (LNode*)malloc(sizeof(LNode));
		s->data = x;
		r->next = s;
		r = s;
		cin >> x;
	}
	r->next = NULL;
	return L;
}

//按序号查找节点值
LNode* GetElem(LinkList L, int i) {
	int j = 1;
	LNode *s;
	s = L->next;
	if (i == 0) {
		return L;
	}
	if (i < 0) {
		return NULL;
	}
	while (s != NULL && j
		s = s->next;
		j++;
	}
	return s;
}


//按值查找表节点
LNode* LocateElem(LinkList L, int e) {
	LNode* s;
	s = L->next;
	while (s!=NULL && s->data!=e) {
		s = s->next;
	}
	return s;
}

//插入节点操作
void Insert(LinkList L, int i,LNode* p) {
	LNode* s = GetElem(L, i - 1);
	if (s==NULL)
	{	
		cout << "插入位置无效" << endl;
		return;
	}
	p->next = s->next;
	s->next = p;
	cout << "在 " << i << " 位置插入成功" << endl;
}


//删除节点操作
void Delect(LinkList L, int i) {
	LNode* s = GetElem(L, i - 1);
	if (s == NULL)
	{
		cout << "删除位置无效" << endl;
		return;
	}
	LNode* p = s->next;
	s->next = p->next;
	free(p);
	cout << "成功删除在 " << i << " 位置的节点" << endl;
}


//打印单链表
void PrintList(LinkList L) {
	LNode* s;
	s = (LNode*)malloc(sizeof(LNode));
	int i = 1;
	s = L->next;
	while (s)
	{
		cout<<"第"<data <next;
	}
}

//打印顺序表长度
//太简单不写了

//菜单
void menu(LinkList &L) {
	int n, e, i;
	LNode* p;
	do
	{
		cout << "tt顺序表操作菜单tt" << endl;
		cout << "tt1.头插法建立单链表tt" << endl;
		cout << "tt2.尾插法建立单链表tt" << endl;
		cout << "tt3.打印单链表tt" << endl;
		cout << "tt4.按序号查找节点值tt" << endl;
		cout << "tt5.按值查找表节点tt" << endl;
		cout << "tt6.插入节点操作tt" << endl;
		cout << "tt7.删除节点操作.tt" << endl;
		cout << "tt8.退出tt" << endl;
		cout << "请输入序号:" << endl;
		cin >> n;
		switch (n)
		{
		case 1:List_HeadInsert(L);//头插法建立单链表
			cout << "插入完成..." << endl;
			break;
		case 2:List_TailInsert(L);//尾插法建立单链表
			cout << "插入完成..." << endl;
			break;
		case 3:PrintList(L);//打印单链表
			cout << "打印完成..." << endl;
			break;
		case 4:cout << "请输入你要查找第几个元素" << endl;
			cin >> i;
			p= GetElem(L, i);
			if(p!=NULL){
				cout << "你要查找的元素为" << p->data << endl<<"查找结束"<
				cout << "未找到" << endl;
			}
			break;
		case 5: cout<< "请输入你要查找的数字" << endl;
			cin >> i;
			p = LocateElem(L, i);
			if (p != NULL) {
				cout << "你要查找的数字已找到 " << p->data << endl << "查找结束" << endl;
			}
			else {
				cout << "未找到" << endl;
			}
			break;
		case 6:cout << "请输入你要插入的位置" << endl;
			cin >> i;
			cout << "请输入你要插入的数字" << endl;
			p = (LNode*)malloc(sizeof(LNode));
			cin >> p->data;
			Insert(L, i, p);
			break;
		case 7:cout << "请输入你要删除的位置" << endl;
			cin >> i;
			Delect(L, i);
			break;
		case 8: return;
		default:
			cout << "输入错误" << endl;
			break;
		}
	} while (true);
}

int main() {
	LinkList L;//创建单链表表
	menu(L);
	cout << "程序已结束运行...";
	return 0;
}