基于TXT文本的简单图书管理系统

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 //////////////////////////////////////////////////////////////////////////////////////

//SqList.h 顺序表数据结构C++类定义（基类）

//////////////////////////////////////////////////////////////////////////////////////
//#ifndef MYHEAD_H    
//  #define MYHEAD_H
//  #include"myhead.h"
//#endif
typedef int Status;
#define LIST_MAX_SIZE  10
#define LISTINCREMENT  3    //顺序表使用的一些常量说明
#define ERROR 0
#define OK 1
//////////////////////////////////////////////////////////////////////////////////////
#include<assert.h>
//顺序表数据结构C++声明（基类）
template <typename ElemType>
class SqList
{
public:

    int n;

    int bin_Search(ElemType key);                                    //有序顺序表折半查找

    void clear();                                                    //把顺序表置空

    Status deleteElem(int i, ElemType& e);                            //删除第i个元素

    Status getElem(int i, ElemType& e);                               //取第i个元素

    int getLength();                                                 //求顺序表中元素的个数

    int getListSize();                                               //取顺序表空间的大小

    Status insert(int i, ElemType e);                                 //在第i个元素之前插入一个元素

    bool isEmpty();                                                  //判断顺序表是否置空

    int locateElem(ElemType e, Status(*compare)(ElemType, ElemType)); //查找第1个与e满足compare()关系的元素的序号

    Status nextElem(ElemType e, ElemType& next_e);  //返回某元素的后继

    SqList<ElemType> operator =(SqList <ElemType> rightL);//重载赋值运算符的定义

    Status priorElem(ElemType e, ElemType& prior_e);//返回某元素的前驱

    int sequentialSearch(ElemType e);//在顺序表中查找某元素


    //******************************系统自动调用构造函数及析构函数声明************************************//

    SqList();

    virtual ~SqList();

    SqList(const SqList<ElemType>& otherL); //顺序表拷贝初始化构造函数

    void SqList<ElemType>::input();

    void SqList<ElemType>::display() const;

    void SqList<ElemType>::randSqList();

    //**************************求并、交、差集****************************************//

    //求两顺序表的并集
    void unionSet(SqList <ElemType> firstL, SqList <ElemType> secondL);


protected:
    ElemType *elem;
    int listSize;
    //int n;
};

///////////////////////////////////////////////////////////////////////////////////

//顺序表数据结构C++类的实现

//////////////////////////////////////////////////////////////////////////////////

//折半查找
template <typename ElemType>
int SqList<ElemType>::bin_Search(ElemType key)
{
    int low, mid, high;
    low = 0, high = n - 1;
    while (low <= high)
    {
        mid = (low + high) / 2;
        if (elem[mid] == key)
            return mid + 1;
        else if (elem[mid]<key)
            low = mid + 1;
        else
            high = mid - 1;
    }
    return 0;
}

//把顺序表置空
template <typename ElemType>
void SqList<ElemType>::clear()
{
    n = 0;
}

//删除第i个元素
template <typename ElemType>
Status SqList<ElemType>::deleteElem(int i, ElemType& e)
{

    if (i<1 || i>n) return ERROR;
    e = elem[i - 1];
    for (int j = i + 1; j <= n; ++j)
        elem[j - 2] = elem[j - 1];
    --n;
    return OK;
}

//取第i个元素
template <typename ElemType>
Status SqList<ElemType>::getElem(int i, ElemType& e)
{
    if (i<1 || i>n) 
    return ERROR;
    e = elem[i - 1];
    return OK;
}

//求顺序表中元素个数
template <typename ElemType>
int SqList<ElemType>::getLength()
{
    return n;
}

//取顺序表存储空间的大小
template <typename ElemType>
int SqList<ElemType>::getListSize()
{
    return listSize;
}

//在第i个元素之后插入一个元素
template <typename ElemType>
Status SqList<ElemType>::insert(int i, ElemType e)
{
    ElemType *newbase;

    if (i<0 || i>n + 1) return ERROR;

    if (n >= listSize)
    {
        newbase = new ElemType[listSize + LISTINCREMENT];
        assert(newbase != 0);
        for (int j = 1; j <= n; ++j)
            newbase[j - 1] = elem[j - 1];

        delete[] elem;
        elem = newbase;
        listSize += LISTINCREMENT;
    }
    for (int j = i+1; j+1<n-1; j++)
        elem[j+1] = elem[j];
    elem[i] = e;
    ++n;
    return OK;
}
//判断顺序表是否为空
template <typename ElemType>
bool SqList<ElemType>::isEmpty()
{
    return n ? false : true;
}

//查找第i个与额满足compare（）关系的元素
template <typename ElemType>
int SqList<ElemType>::locateElem(ElemType e, Status(*compare)(ElemType, ElemType))
{
    int i = 1;
    for (i = 1; i <= n && !(*compare)(elem[i - 1], e); ++i);

    if (i <= n)
        return i;
    else
        return 0;
}

//返回某元素的后继
template <typename ElemType>
Status SqList<ElemType>::nextElem(ElemType e, ElemType& next_e)
{
    int i = locateElem(e, equal);
    if (i<1 || i == n)
        return ERROR;
    else
        getElem(i + 1, next_e);
    return OK;
}

//重载赋值运算符的定义
template <typename ElemType>
SqList<ElemType> SqList<ElemType>::operator=(SqList<ElemType>rightL)
{
    if (this != &rightL)
    {
        if (listSize<rightL.listSize)
        {
            delete[] elem;
            elem = new ElemType[rightL.listSize];
            assert(elem != 0);
            listSize = rightL.listSize;
        }
        n = rightL.n;
        for (int i = 1; i <= n; ++i)
            elem[i - 1] = rightL.elem[i - 1];
    }
    return *this;
}

//返回某元素的前驱
template <typename ElemType>
Status SqList<ElemType>::priorElem(ElemType e, ElemType& prior_e)
{
    int i = locateElem(e, equal);

    if (i <= 1)
        return ERROR;
    else
        getElem(i - 1, prior_e);
    return OK;
}

//在顺序表中顺序查找某元素
template <typename ElemType>
int SqList<ElemType>::sequentialSearch(ElemType key)
{
    for (int i = 1; i <= n; && key != elem[i - 1]; ++i);

    if (i <= n)
        return i;
    else
        return 0;
}

//**************************系统自动调用初始化构造函数****************************//

//构造函数
template <typename ElemType>
SqList<ElemType>::SqList()
{
    elem = new ElemType[LIST_MAX_SIZE];
    assert(elem != 0);
    listSize = LIST_MAX_SIZE;
    n = 0;
}

//顺序表析构函数
template <typename ElemType>
SqList<ElemType>::~SqList()
{
    delete[] elem;
}

//顺序表初始化构造函数
template <typename ElemType>
SqList<ElemType>::SqList(const SqList<ElemType>& otherL)
{
    elem = new ElemType[otherL.listSize];
    assert(elem != 0);
    listSize = otherL.listSize;
    n = otherL.n;
    for (int i = 1; i <= n; ++i)
        elem[i - 1] = otherL.elem[i - 1];
}

//////////////////////////////////////////////////////////////////////////////////////

//输入顺序表
template <typename ElemType>
void SqList<ElemType>::input()
{
    cout << "请输入顺序表元素的个数:";
    cin >> n;
    cout << "请输入顺序表:";
    for (int i = 0; i<n; ++i)
        cin >> elem[i];
}


// 输出顺序表

template <typename ElemType>
void SqList<ElemType>::display() const
{
    cout << "当前顺序表有" << n << "个元素，分别为：" << endl;
    for (int i = 1; i <= n; ++i)
        cout << "[" << i << "] ";
    cout << endl;
    for (int i = 1; i <= n; ++i)
        cout << " " << elem[i - 1] << " ";
    cout << endl;
    cout << endl;
}


//随机生成顺序表

template <typename ElemType>
void SqList<ElemType>::randSqList()
{
    srand((unsigned)time(NULL));

    cout << "用以下随机数作为当前顺序表的元素:" << endl;

    for (int i = 0; i<listSize; i++)
    {
        elem[i] = rand() % 100 + 1;
        cout << elem[i] << " ";
        n++;
    }
    cout << endl;
    // cout<<endl<<"输出随机生成的顺序表，";
    /*for(int i=1;i<=n;++i)
    cout<<"["<<i<<"] ";
    cout<<endl;
    for(int i=1;i<=n;++i)
    cout<<" "<<elem[i-1]<<" ";
    cout<<endl;*/
    //display( );
}


////////////////////////////////////////////////////////////////////////////////

//功能：判断两整数是否相等
//输入：函数的值参a和b为需要比较的两个整数
//输出：若a等于b，函数的返回值为OK;否则为ERROR
Status equal(int a, int b)
{
    if (a == b)
        return OK;
    else
        return ERROR;
}

//功能：判断一个整数是否大于另一个整数
//输入：函数的值参a和b为需要比较的两个整数
//输出：若a大于b，函数的返回值为OK；否则为ERROR
Status great(int a, int b)
{
    if (a>b)
        return OK;
    else
        return ERROR;
}

//功能：判断一个整数是否小于另一个整数
//输入：函数的值参a和b为需要比较的两个整数
//输出：若a小于b，函数的返回值为OK；否则为ERROR
Status small(int a, int b)
{
    if (a<b)
        return OK;
    else
        return ERROR;
}

//////////////////////////////////////////////////////////////////////////////////////

//求两顺序表的并集
template <typename ElemType>
void SqList <ElemType>::unionSet(SqList <ElemType> firstL, SqList <ElemType> secondL)
{
    ElemType e;
    SqList <ElemType> thirdL(firstL);

    for (int i = 1; i <= secondL.getLength(); ++i)
    {
        cout << thirdL.n << endl;
        secondL.getElem(i, e);
        if (!firstL.locateElem(e, equal))
        {   //++thirdL.n;
            thirdL.insert(thirdL.n + 1, e);
        }
    }
    thirdL.display();
}

//派生图书信息类
#include"Sqlist.h"
#include<string>
#include <sstream>
#include <strstream>
using namespace std;//用string必带
enum book
{
    children_book,
    learn_book,
    tool_book,
    story_book,
    Science_book
};
struct Book_data
{
    int ID;
    string name;
    double price;
    book type;
    bool borrow;
};
class Dc_wr
{
private:    static int n;
public:
    static bool  Write_dc(string a,string b)//追加
    {
        ofstream f1(b, ios::app);
        if (!f1)
            return false;//打开文件失败则结束运行
        f1 << a << endl;//使用插入运算符写文件内容
        f1.close();//关闭文件
        n++;
        return true;
    }
    static bool  Write_fg(string a, string b)//覆盖
    {
        ofstream f1(b);
        if (!f1)
            return false;//打开文件失败则结束运行
        f1 << a << endl;//使用插入运算符写文件内容
        f1.close();//关闭文件
        n++;
        return true;
    }
    static bool  Read_dc(string &a,string b)
    {
        ifstream f1(b);
        if (!f1)
        {
            f1.close();
            return false;
        }
        f1 >> a;
        f1.close();
        return true;
    }
    static bool  Read_zline(string &a, int b,string c)
    {
        ifstream f1(c);
        if ((!f1) && b <= n)
        {
            f1.close();
            return false;
        }
        for (int i = 1; i <= b; i++)
            f1 >> a;
        f1.close();
        return true;

    }
    static bool Read_star(string &a, int b)//程序开始时取出文本指定行数据返回字符串
    {
        string c;//接受不要的行字符串
        ifstream f1("library.txt");
        for (int i = 1; i <= b; i++)
        {
            if (i == b)
            {
                f1 >> c;
                if (c != "")
                {
                    a = c;
                    f1.close();
                    return true;
                }
                else
                {
                    f1.close();
                    return false;
                }
            }
            f1 >> c;
            if (c == "")
            {
                f1.close();
                return false;
            }
        }
        f1.close();
        return false;
    }
    static bool Del(int b)
    {
        string a;
        ofstream f2("library(复本).txt", ios::app);
        if (!f2)
            return false;
        ifstream f1("library.txt");
        if (!f1)
            return false;
        for (int i=0; ;i++)
        {
            f1 >> a;
            if (i == b)
                continue;
            if (a == "#")
            {
                f2 << a;
                break;
            }
            f2 << a;
        }
        f2.close();
        f1.close();
        ofstream f3("library.txt", ios::trunc);
        ifstream f4("library.txt(复本).txt");
        for (;;)
        {
            f4 >> a;
            f3 << a;
            if (a == "#")
                break;
        }
    
    }
    static bool  txt_to_txt(string b, string c, bool s)//用b覆盖c 清空b s为假添加#结束标记
    {
        string a;
        ofstream f2(c, ios::trunc);//of写  if读  ios::trunc清空原文本后打开
        ifstream f1(b);
        for (;;)
        {
            f1 >> a;
            if (a == "#")//遇到结束标记则关闭
                break;
            if (a == "")//读出字符串为空则关闭
                break;
            a = a + '\n';//换行
            f2 << a;
        }
        f2.close();
        if (!s)//根据参数判断是否给予结束标记
        {
            Dc_wr::Write_dc("#", c);
        }
        return true;
    }

};
class Book_in :public  SqList<Book_data>
{
public:
    ~Book_in()
    {

        Class_totxt();
        Dc_wr::Write_dc("#", "library(复本).txt");//加上结束标记方便下一次程序对文本读取
    }
    int Find_book(int ID);
    int Find_book(string name);
    bool Add_book(Book_data e,bool a);
    string Record_tostring(Book_data e);
    void  txt_toclass();
    void  Out_book(int i);
    void  Borrow_book();
    void Class_totxt();
    void Return_book();
    void Change_book();
};


bool Book_in::Add_book(Book_data e, bool a)//把e添加到类  如果a为真则添加到存本
{
    if (a)
    {
        string record = Record_tostring(e);
        Dc_wr::Write_dc(record, "library.txt");
        cout << record << "添加到文本成功" << endl;
    }
    string record = Record_tostring(e);
    if (insert(n, e))
    {
        cout << record << "填加到class成功" << endl;
        return true;
    }
    else
        return false;
}
string Book_in::Record_tostring(Book_data e)
{
    string chge;
    strstream change;
    string record = "";
    change << e.ID;
    change >> chge;
    record = record + chge + "|" + e.name;
    strstream change3;
    change3 <<e.price;
    change3 >> chge;
    record = record + "|" + chge;
    switch (e.type)
    {
    case children_book:record = record + "|" + "1"; break;
    case learn_book:record = record + "|" + "2"; break;
    case tool_book:record = record + "|" + "3"; break;
    case story_book:record = record + "|" + "4"; break;
    case Science_book:record = record + "|" + "5"; break;
    default:
        break;
    };
    if (e.borrow)
    record = record + "|" + "1"; 
    else
    record = record + "|" + "2";
    return record;
}
void Book_in::txt_toclass()
{
    int x, y;
    Book_data e;//把分割好的字符串转化为相应的类型赋值成为一个Bool_data类型
    for (int p=1;;p++)//p控制接受输出字符串的数组
    {
        int i = 0;
        string a;
        string data[5];
        Book_data check;
        if (!Dc_wr::Read_star(a, p))
            return;
        //if (a == "#")
        //    return;
        for each (char b in a)//利用for each取出字符串存放在数组
        {
            if (i == 5)//1个Book_data中有5值
                break;
            if (b != '|')
            {
                data[i] = data[i] + b;
            }
            else
            {
                i++;
            }
        }
        //对应的数据类型转换
        stringstream f1;
        f1 << data[0];
        f1 >> e.ID;

        e.name = data[1];


        stringstream f2;
        f2 << data[2];
        f2 >> e.price;

        stringstream f3;
        f3 << data[3];
        f3 >> x;
        switch (x)
        {
        case 1: e.type = children_book; break;
        case 2: e.type = learn_book; break;
        case 3: e.type = tool_book; break;
        case 4: e.type = story_book; break;
        case 5: e.type = Science_book; break;
        default:
            break;
        }

        stringstream f4;
        f4 << data[4];
        f4 >> y;
        switch (y)
        {
        case 1: e.borrow = true; break;
        case 2: e.borrow = false; break;
        default:
            break;
        }
        //对应的数据类型转换
        if (check.ID == e.ID)
            return;
       Add_book(e, false);//把Book_data 填加到类
       check = e;
    }
}
void Book_in::Out_book(int i)
{
        cout << elem[i].ID << "   " << elem[i].name << "   " << elem[i].price << "   ";
        switch (elem[i].type)
        {
        case children_book:cout << "儿童类" << "      "; break;
        case learn_book:cout << "学习类" << "       "; break;
        case tool_book:cout << "工具类" << "      "; break;
        case story_book:cout << "小说类" << "      "; break;
        case Science_book:cout << "科学类" << "      "; break;
        default:
            break;
        };
        if (elem[i].borrow)
            cout << "被借阅" << endl;
        else
            cout << "未被借阅" << endl;
}
int Book_in::Find_book(int ID)
{
    for (int i = 0; i <=n - 1;i++)
    {
        if (elem[i].ID == ID)
        {
            Out_book(i);
            return i;
        }
    }
    cout << "没有找到相关书籍" << endl;
    return -1;
}
int Book_in::Find_book(string name)
{
    for (int i = 0; i <= n - 1; i++)
    {
        if (elem[i].name == name)
        {
            Out_book(i);
            return i;
        }
    }
    cout << "没有找到相关书籍" << endl;
    return -1;
}
void Book_in::Borrow_book()
{
    int ID;
    int i;
    char t;
    p:
    cout << "请输入书籍ID" << endl;
    cin >> ID;
    i = Find_book(ID);
    if (i+1)
    {
        if (!elem[i].borrow)
        {
            cout << "该书现在可以借出" << endl;
            cout << "是否借书？(y or anykey)" << endl;
            cin >> t;
            if (t == 'y')
                elem[i].borrow = true;
            cout << "OK" << endl;
        }
        else
            cout << "该书现在已经被借走" << endl;
    }
    else
    {
        cout << "没有找到请重新输入" << endl;
        goto   p;
    }
}
void Book_in::Class_totxt()
{
    Book_data e;
    string a;
    for (int i = 1; i <= n; i++)
    {
        getElem(i, e);
        a=Record_tostring(e);
        if (i == 1)
            Dc_wr ::Write_fg(a, "library(复本).txt");//第一行覆盖原文本
        else
            Dc_wr ::Write_dc(a, "library(复本).txt");//追加
    }
}
void Book_in::Return_book()
{
    int ID;
    int i;
    cout << "请输入书籍ID" << endl;
    cin >> ID;
    i = Find_book(ID);
    if (i + 1)
    {
        elem[i].borrow = false;
        cout << "已完成还书！" << endl;
    }
}
void Book_in::Change_book()
{
    int ID;
    int change;
    int i;
    cout << "请你输入你要修改书的ID" << endl;
    cin >> ID;
    i = Find_book(ID);
    if (i + 1)
    {
        cout << "找到图书!" << endl;
    }
    else
    {
        cout << "未找到图书" << endl;
        return;
    }
    cout << "请输入要修改的项:"<<"1.ID" << "    2.书名"<< "   3.价格"<< "   4.书类"<< "   5.是否被借阅"<<"6.删除整个书的信息"<< endl;
    cin >> change;
    switch (change)
    {
    case 1:
    {
        int a;
        cout << "请输入你要改的ID" << endl;
        cin >> a;
        elem[i].ID = a;
        cout << "修改成功!" << endl;
    }; break;
    case 2:
    {
        string a;
        cout << "请输入你要改的书名" << endl;
        cin >> a;
        elem[i].name = a;
        cout << "修改成功!" << endl;
    }; break;
    case 3:
    {
        int a;
        cout << "请输入你要改的价格" << endl;
        cin >> a;
        elem[i].price = a;
        cout << "修改成功!" << endl;
    }; break;
    case 4:
    {
        int a;
        string  c[] = { "儿童类", "学习类", "工具类", "小说类", "科学类" };
        cout << "请输入你要修改的书的类别(1." << c[0] << "   2." << c[1] << "   3." << c[2] << "   4." << c[3] << "   5." << c[4] << endl;
        cin >> a;
        switch (a)
        {
        case 1: elem[i].type = children_book; break;
        case 2: elem[i].type = learn_book; break;
        case 3: elem[i].type = tool_book; break;
        case 4: elem[i].type = story_book; break;
        case 5: elem[i].type = Science_book; break;
        default:
            break;
        }
        cout << "修改成功!" << endl;
    }; break;
    case 5:
    {
        if (elem[i].borrow)
            elem[i].borrow = false;
        else
            elem[i].borrow = true;
        cout << "修改成功!" << endl;
    }
    case 6:
    {
        Book_data a;
        deleteElem(i+1, a);
        cout << "修改成功!" << endl;
    }
    default:
        break;
    }
}

//mian  
#include<iostream>
#include<fstream>
//#include"Query_sequence.h"
#include"Book_information.h"
using namespace std;
int Dc_wr::n = 0;
int Menu()
{
    int choice;
    system("cls");
    cout << "****************************************************图书管理系统****************************************************" << endl;
    //cout << "①⑧⑨⑩" << endl;
    cout << "▓ ①增加图书                                                                                                      ▓" << endl;
    cout << "▓ ②查看现有图书                                                                                                  ▓" << endl;
    cout << "▓ ③借书                                                                                                          ▓" << endl;
    cout << "▓ ④还书                                                                                                          ▓" << endl;
    cout << "▓ ⑤修改图书                                                                                                      ▓" << endl;
    cout << "▓ ⑥查找书籍                                                                                                      ▓" << endl;
    cout << "****************************************************图书管理系统****************************************************" << endl;
    cout << "请选择:";
    cin >> choice;
    return choice;
}
void Add(Book_in& library)
{
    Book_data a;
    //Book_data b;
    //Book_data c;
    book type;
    int  b;
    string o;
    string  c[] = { "儿童类", "学习类", "工具类", "小说类", "科学类" };
    cout << "请输入ID" << endl;
    cin >> a.ID;
    cout << "请输入书名" << endl;
    cin >> a.name;
    cout << "请输入书的价格" << endl;
    cin >> a.price;
book_type_xuanz:
    cout << "请输入数的类别(1." << c[0] << "   2." << c[1] << "   3." << c[2] << "   4." << c[3] << "   5." << c[4] << endl;
    cin >> b;
    switch (b)
    {
    case 1: a.type = children_book; break;
    case 2: a.type = learn_book; break;
    case 3: a.type = tool_book; break;
    case 4: a.type = story_book; break;
    case 5: a.type = Science_book; break;
    default:cout << "选择错误！请重新选择" << endl; goto book_type_xuanz;
    };
    getchar();
    cout << "书是否被借出(n OR y)" << endl;
    cin >> o;
    if (o == "n")
        a.borrow = false;
    else
        a.borrow = true;
    library.Add_book(a, true);
    //a.ID = 1;
    //a.borrow = false;
    //a.name = "first";
    //a.price = 12;
    //a.type = tool_book;
    //b.ID = 2;
    //b.borrow = false;
    //b.name = "scend";
    //b.price = 13;
    //b.type = learn_book;
    //c.ID = 3;
    //c.borrow = true;
    //c.name = "third";
    //c.price = 14;
    //c.type = story_book;
    //library.Add_book(a,true);
    //library.Add_book(b,true);
    //library.Add_book(c,true);
}
int main()
{
    Book_in library;//一个图书类
    int choice;//用户菜单选择
    Book_data h;
    Dc_wr::txt_to_txt("library(复本).txt", "library.txt",true);//以复本覆盖存本
    library.txt_toclass();//根据存本提出字符串转化为类
    start:
    choice=Menu();
    switch (choice)
    {
    case 1:
    {
        for (char m = 'y'; m != 'n';)
        {
            Add(library);
            getchar();
            cout << "是否继续添加？(n OR y)" << endl;
                m=getchar();
        }

    }
        break;
    case 2:
    {
        if (library.n == 0)
        {
            cout << "无" << endl;
        }
        cout << "ID" << "     " << "书名" << "    " << "价格" << "   " << "类型" << "       " << "是否被借阅" << endl;
        for (int i = 0; i <=library.n - 1; i++)
              library.Out_book(i); 
    }; break;
    case 3:
    {
        library.Borrow_book();
    }
        ; break;
    case 4:
    {
        library.Return_book();
    }
        ; break;
    case 5:
    {
        library.Change_book();
    }
        ; break;
    case 6:
    {
        int p;
        int ID;
        string name;
        cout << "通过ID查找输入1 通过书名查找输入2" << endl;
        cin >> p;
        if (p == 1)
        {
            cout << "请输入ID" << endl;
            cin >> ID;
            cout << "相关信息" << endl;
            library.Find_book(ID);
        }
        else
        {
            cout << "请输入书名" << endl;
            cin >> name;
            cout << "相关信息" << endl;
            library.Find_book(name);
        }

    }
    default:
        break;
    };
    char k;
    cout << "是否继续选择?(anykey or y)" << endl;
    cin >> k;
    if (k == 'y')
        goto start;
    system("pause");
    return 0;
}