单链表C++实现代码

链接：双向链表C++实现代码
因为没什么事做就写一下单链表的操作，反正是基础数据结构，长时间不写的话再写会出现一下小的细节毛病，多练习练习，理解也更加深点。
单链表写顺，队列的入队出队就是单链表的头插和尾删而已，栈的入栈出栈就是单链表的尾插尾删而已，有时间把双向链表也写写得

#include <string>
#include <iostream>
using namespace std;

typedef int DataType;

class Node
{
public:
	DataType data;
	Node *next;
};

class LinkList
{
public:
	LinkList();
	~LinkList();
	int CreateLinkList(int size);
	int BYELinkList();
	int TravalLinkList();
	int InsertLinklList(Node *data, int n);
	int DeleteLinklist(int n);

	int GetLen();
	bool IsEmply();

	Node *head;
	int size;
};

LinkList::LinkList()
{
	head = new Node;
	head->data = 0;
	head->next = NULL;
	size = 0;
}

LinkList::~LinkList()
{
	delete head;
}

int LinkList::CreateLinkList(int n)
{
	if (n<0) {
		printf("error\n");
		return -1;
	}
	Node *ptemp = NULL;
	Node *pnew = NULL;
	
	this->size = n;
	ptemp = this->head;
	for(int i =0 ; i<n ; i++)
	{
		pnew = new Node;
		pnew->next = NULL;
		cout << "输入第" << i+1 << "个节点值" << endl;
		cin >> pnew->data;
		ptemp->next = pnew;
		ptemp = pnew;
	}
	cout << "创建完成" << endl;
	return 0;
}

int LinkList::BYELinkList()
{
	Node *ptemp;
	if (this->head == NULL) {
		cout << "链表原本就为空" << endl;
		return -1;
	}
	while (this->head)
	{
		ptemp = head->next;
		free(head);
		head = ptemp;
	}
	cout << "销毁链表完成" << endl;
	return 0;
}

int LinkList::TravalLinkList()
{
	Node *ptemp = this->head->next;
	if (this->head == NULL) {
		cout << "链表为空" << endl;
		return -1;
	}
	while(ptemp)
	{
		cout << ptemp->data << "->";
		ptemp = ptemp->next;
	}
	cout <<"NULL"<< endl;
	return 0;
}

int LinkList::InsertLinklList(Node *data, int n)
{
	Node *ptemp;
	if (this->head == NULL) {
		cout << "链表为空" << endl;
		return -1;
	}
	if (data == NULL) {
		cout << "插入节点为空" << endl;
		return -1;
	}
	//头插
	if (n<2) {
		Node *pnew = new Node;
		pnew->data = data->data;
		pnew->next = this->head->next;
		this->head->next = pnew;
		this->size++;
		return 0;
	}
	//尾插
	if (n > this->size) {
		ptemp = this->head;
		while (ptemp->next != NULL) {
			ptemp = ptemp->next;
		}
		Node *pnew = new Node;
		pnew->data = data->data;
		pnew->next = NULL;
		ptemp->next = pnew;
		this->size++;
		return 0;
	}
	//中间插
	else {
		ptemp = this->head;
		for (int i = 1; i < n; i++) {
			ptemp = ptemp->next;
		}
		Node *pnew = new Node;
		pnew->data= data->data;
		pnew->next = ptemp->next;
		ptemp->next = pnew;
		this->size++;
		return 0;
	}
}

int LinkList::DeleteLinklist(int n)
{
	Node *ptemp;
	Node *ptemp2;
	if (n > this->size) {
		cout << "n太大" << endl;
		return -1;
	}
	//删头节点
	if (n < 2) {
		ptemp = this->head->next;
		this->head->next = ptemp->next;
		free(ptemp);
		this->size--;
		return 0;
	}
	//尾部删除
	if (n == this->size) {
		ptemp = this->head;
		for (int i = 1; i < this->size;i++) {
			ptemp = ptemp->next;
		}
		ptemp2 = ptemp->next;
		ptemp->next = NULL;
		free(ptemp2);
		this->size--;
		return 0;
	}
	//中间删除
	else
	{
		ptemp = this->head;
		for (int i = 1; i < n; i++) {
			ptemp = ptemp->next;
		}
		ptemp2 = ptemp->next;
		ptemp->next = ptemp2->next;
		free(ptemp2);
		this->size--;
		return 0;
	}
}

int LinkList::GetLen()
{
	return this->size;
}

bool LinkList::IsEmply()
{
	if (this->head == NULL) {
		return true;
	}
	else{
		return false;
	}
}

void main(void)
{
	LinkList list;
	LinkList *plist = &list;
	plist->CreateLinkList(5);
	plist->TravalLinkList();
	Node temp;
	temp.data = 100;
	temp.next = NULL;
	plist->InsertLinklList(&temp, 0);
	plist->TravalLinkList();
	plist->InsertLinklList(&temp, plist->GetLen()+1);
	plist->TravalLinkList();
	plist->InsertLinklList(&temp, 5);

	plist->TravalLinkList();
	plist->DeleteLinklist(0);
	plist->TravalLinkList();
	plist->DeleteLinklist(list.GetLen());
	plist->TravalLinkList();
	plist->DeleteLinklist(2);
	plist->TravalLinkList();


	plist->BYELinkList();
	system("pause");
}