C++图书馆管理系统（简单版）

1、 总体功能分析

实用的图书馆管理系统应该至少包括一下功能：

1、上传：新进图书以及基本信息的输入

2、删除：旧图书以及基本信息的删除

3、显示：显示图书馆已有的所有图书

4、查找：查询要借阅的图书信息

5、借阅：实现用户办理借阅手续

6、归还：实现用户办理归还手续

系统以菜单方式工作使界面友好，易于操作。

2、建立相关属性

由于系统设计的是一些图书和读者的信息存储，因此，需要定义一个数据结构来存储相关信息。

首先需要建立一个图书类、图书数据库类、读者类以及读者数据库类，并定义图书和读者的各种属性。

#include "iostream"
#include "string"
#include "conio.h"
using namespace std;

struct Date{//日期结构
    int m_nYear;//年
    int m_nMonth;//月
    int m_nDay;//日
};

struct Reader{//读者结构
    string name;//读者姓名
    Date bro;//借出时间
    Date back;//归还时间
};

struct Book{//图书结构
    int m_nBook_Number;//图书编号
    string m_strTitle;//书名
    string m_strWroter;//作者
    int m_nMoreNum;//当前在图书馆数量
    int m_nTotalHoldNum;//图书馆共计数量
    string m_sttrComment;//图书介绍
    Reader reader[20];
};

struct Info{//借书信息结构
    Info *m_pParentPoint;//前驱节点
    Book *m_oBookInfo;//对应图书信息
    Info *m_pNextPoint;//后继节点

};

3、图书馆菜单

程序开始运行，将显示选择菜单，供用户选择需要的功能，用户根据需要，输入不同的数字来选择相应功能。

int  Select_Menu(){
    //图书管理系统主界面
    cout << "--------------------------------------------------" << endl << endl;
    cout << "              图  书  馆  管  理  系  统             " << endl;
    cout << "                     主  菜  单                     " << endl << endl;
    cout << "                    1.上传图书" << endl;
    cout << "                    2.下架图书" << endl;
    cout << "                    3.显示图书" << endl;
    cout << "                    4.借阅图书" << endl;
    cout << "                    5.归还图书" << endl;
    cout << "                    6.退出系统" << endl << endl;
    cout << "               请选择菜单项：（1-6）" << endl;
    cout << "--------------------------------------------------" << endl;
    int id = 0;//编号
    cout << "请输入您的选择：";
    cin >> id;
    return id;
}

4、图书上传

将图书信息添加到图书馆中

Book *InputNode(){
    //上传图书
    Book *p = new Book;//动态分配一片大小为sizeof(Book)字节的空间，并将该内存空间的起始位置赋值给p
    system("cls");//清屏
    fflush(stdin);//清楚以前的输入
    cout << "请输入图书编号："; cin >> p->m_nBook_Number;
    cout << "请输入图书："; cin >> p->m_strTitle;
    cout << "请输入作者："; cin >> p->m_strWroter;
    cout << "请输入当前在图书馆数量："; cin >> p->m_nMoreNum;
    cout << "请输入图书馆共计数量："; cin >> p->m_nTotalHoldNum;
    cout << "请输入图书介绍："; cin >> p->m_sttrComment;
    for(int i = 0; i < 20; i++){//初始化书本结构成员中相关读者指针内容为空
        (p->reader[i]).name = '\0';
    }
    return p;//返回成功读入的书本信息
}

Info *Insert_BookInfo(Info *bth){
    //上传图书
    int flag, k, x;
    cout << "请输入您想上传的图书编号：";//按照书本编号进行查找
    cin >> x;
    Info *p = Sreach(bth, x, &k, &flag);
    if(flag == 1){//找到直接对已有的数量进行修改
        cout << "当前图书馆内拥有这本书" << p->m_oBookInfo->m_nMoreNum << "本，您想在增加一本" << p->m_oBookInfo->m_strTitle << "书？(Y/N)" << endl;
        char ch;
        cin >> ch;
        if(ch == 'Y' || ch == 'y'){
            p->m_oBookInfo->m_nMoreNum++;
            p->m_oBookInfo->m_nTotalHoldNum++;
            cout << "增加后图书馆内拥有这本书" << p->m_oBookInfo->m_nMoreNum << "本，一共拥有" << p->m_oBookInfo->m_nTotalHoldNum << "本" << endl;
        }
        return bth;
    }
    //图书管内未找到这本图书编号
    Book * r = InputNode();
    if(bth == NULL){//当bth指针为空时，需要对其进行单独处理，链表表头内存的分配
        bth = new Info;
        bth->m_pParentPoint = NULL;
        bth->m_oBookInfo = r;
        bth->m_pNextPoint = NULL;
    }
    else {
        //说明存在头指针
        p = bth;
        while (p->m_pNextPoint != NULL)
            p = p->m_pNextPoint;
        Info *q = new Info;
        q->m_oBookInfo = r;
        q->m_pNextPoint = NULL;
        q->m_pParentPoint = p;
        p->m_pNextPoint = q;
    }
    return bth;
}

5、 删除图书

将图书信息从图书馆中删除

Info *Delete_BookInfo(Info * bth){
    //删除图书
    int flag, k, x;
    cout << "请输入您想删除的图书编号：";//按照书本编号进行查找
    cin >> x;
    Info *p = Sreach(bth, x, &k, &flag);
    if(flag == 0){//为查找图书编号
        cout << "图书馆内并没有这本书！！！" << endl;
        return bth;
    }
    else{
        if(p == NULL){//确保当前操作是有效的，防止出现非法操作
            cout << "查找错误" << endl;
            return bth;
        }
        else {
            cout << "你想删除的图书信息如下：" << endl;
            cout << "图书编号：" << p->m_oBookInfo->m_nBook_Number << endl;
            cout << "书名：" << p->m_oBookInfo->m_strTitle << endl;
            cout << "作者：" << p->m_oBookInfo->m_strWroter << endl;
            cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum << endl;
            cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum << endl;
            cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
            cout << "您确定删除吗？(Y/N)" << endl;
            char ch;
            cin >> ch;
            if(ch == 'Y' || 'y'){
                if(p->m_pNextPoint != NULL && p->m_pParentPoint != NULL){//夹在链表中间的节点
                    Info *Left = p->m_pParentPoint;//将要删除节点的前驱节点指向赋值给前驱结点指针变量
                    Info *Right = p->m_pNextPoint;//将要删除节点的后继结点指向赋值给后继结点指针变量
                    Left->m_pNextPoint = Right;//将后继结点指针指向的地址作为前驱结点的后继域
                    Right->m_pParentPoint = Left;//将前驱结点指针指向的地址作为后继结点的前驱域
                    //释放空间
                    p->m_pNextPoint = NULL;
                    p->m_pParentPoint = NULL;
                    delete p->m_oBookInfo;
                    p->m_oBookInfo = NULL;
                    delete p;
                    p = NULL;
                    return bth;
                }
                else if(p->m_pParentPoint == NULL){//首结点的前驱为空，处理首结点删除操作
                    if(p->m_pNextPoint == NULL){//说明只有一个结点
                        delete p->m_oBookInfo;
                        p->m_oBookInfo = NULL;
                        delete p;
                        p = NULL;
                        return bth;
                    }
                    bth = p->m_pNextPoint;
                    bth->m_pParentPoint = NULL;

                    p->m_pNextPoint = NULL;
                    p->m_pParentPoint = NULL;
                    delete p->m_oBookInfo;
                    p->m_oBookInfo = NULL;
                    delete p;
                    p = NULL;
                    return bth;
                }
                else if(p->m_pNextPoint == NULL){
                    Info *Left = p->m_pParentPoint;
                    Left->m_pNextPoint = NULL;

                    p->m_pNextPoint = NULL;
                    p->m_pParentPoint = NULL;
                    delete p->m_oBookInfo;
                    p->m_oBookInfo = NULL;
                    delete p;
                    p = NULL;
                    return bth;
                }
            }
        }
    }
}

6、 查找图书

根据输入的图书编号，是心啊图书的查找。

Info *Sreach(Info *bth, int x, int *k, int *flag){
    //搜索图书
    Info *p = bth;
    *flag = 0;
    while(p){
        if(p->m_oBookInfo->m_nBook_Number == x){//寻到相同的图书编号
            *flag = 1;
            return p;
        }
        else {
            *flag = 0;
        }
        if(p->m_pNextPoint != NULL) {
            p = p->m_pNextPoint;
        }
        else{
            break;
        }
    }
    return bth;
}

7、显示图书信息

显示图书馆中所有的图书信息。

void Output_BookInfo(Info * bth){
    //输出图书信息
    system("cls");
    Info *p = bth;
    while (p){
        cout << "图书编号：" << p->m_oBookInfo->m_nBook_Number;
        cout << "书名：" << p->m_oBookInfo->m_strTitle;
        cout << "作者：" << p->m_oBookInfo->m_strWroter;
        cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum;
        cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum;
        cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
        p = p->m_pNextPoint;
    }
}

8、图书借阅

根据输入的相关信息，实现借阅

void Borrow_TheBook(Info *bth){
    //图书借出
    system("cls");
    int flag, k, x, i = 0;
    cout << "请输入您想借阅的图书编号：";//按照书本编号进行查找
    cin >> x;
    Info *p = Sreach(bth, x, &k, &flag);
    if(flag == 1){
        Book *r = p->m_oBookInfo;
        cout << "你想借阅的图书信息如下：" << endl;
        cout << "书名：" << p->m_oBookInfo->m_strTitle << endl;
        cout << "作者：" << p->m_oBookInfo->m_strWroter << endl;
        cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum << endl;
        cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum << endl;
        cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
        cout << "您确定借阅吗？(Y/N)" << endl;
        char ch;
        cin >> ch;
        if(ch == 'Y' || ch == 'y'){
            if(r->m_nMoreNum == 0) cout << "对不起，本书 已经全部借出···" << endl;
            else{
                system("cls");
                for(i = 0; i < 20; i++)
                    if((r->reader[i]).name[0] == '\0') break;
                cout << "请输入借阅者的姓名：";cin >> (r->reader[i]).name;
                cout << "请输入借出日期：" << endl;
                cout << "请输入借出年份：";cin >> (r->reader[i]).bro.m_nYear;
                cout << "请输入借出月份：";cin >> (r->reader[i]).bro.m_nMonth;
                cout << "请输入借出日：";cin >> (r->reader[i]).bro.m_nDay;
                cout << "请输入归还日期：" << endl;
                cout << "请输入归还年份：";cin >> (r->reader[i]).back.m_nYear;
                cout << "请输入归还月份：";cin >> (r->reader[i]).back.m_nMonth;
                cout << "请输入归还日：";cin >> (r->reader[i]).back.m_nDay;
                r->m_nMoreNum--;
                cout << endl << "成功接到这本书" << endl;
            }
        }
    }
}

9、图书归还

根据输入的图书编号归还图书。文章来源地址https://www.toymoban.com/news/detail-492713.html

void TurnBack_TheBook(Info *bth){
    //图书归还
    system("cls");
    int flag, k, x, i = 0, j = 0;
    cout << "请输入您想借阅的图书编号：";//按照书本编号进行查找
    cin >> x;
    Info *p = Sreach(bth, x, &k, &flag);
    if(flag == 1){
        Book *r = p->m_oBookInfo;
        cout << "你想归还的图书信息如下：" << endl;
        cout << "书名：" << p->m_oBookInfo->m_strTitle << endl;
        cout << "作者：" << p->m_oBookInfo->m_strWroter << endl;
        cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum << endl;
        cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum << endl;
        cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
        cout << "您确定归还吗？(Y/N)" << endl;
        char ch;
        cin >> ch;
        if(ch == 'Y' || ch == 'y'){
            system("cls");
            cout << "请输入借阅者的姓名：";
            string nm;
            cin >> nm;
            for(i = 0; i < 20; i++)
                if((r->reader[i]).name == nm) {
                    j = 1;
                    break;
                }
            if(j == 0) {
                cout << "你未借阅过这本书" << endl;
                return;
            }
            (r->reader[i]).name[0] = '\0';
            r->m_nMoreNum++;
            cout << "书名：" << p->m_oBookInfo->m_strTitle << endl;
            cout << "作者：" << p->m_oBookInfo->m_strWroter << endl;
            cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum << endl;
            cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum << endl;
            cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
        }
    }
    else cout << "您不能归还不存在的图书" << endl;
}

10、完整代码

#include "iostream"
#include "string"
#include "conio.h"
using namespace std;

struct Date{//日期结构
    int m_nYear;//年
    int m_nMonth;//月
    int m_nDay;//日
};

struct Reader{//读者结构
    string name;//读者姓名
    Date bro;//借出时间
    Date back;//归还时间
};

struct Book{//图书结构
    int m_nBook_Number;//图书编号
    string m_strTitle;//书名
    string m_strWroter;//作者
    int m_nMoreNum;//当前在图书馆数量
    int m_nTotalHoldNum;//图书馆共计数量
    string m_sttrComment;//图书介绍
    Reader reader[20];
};

struct Info{//借书信息结构
    Info *m_pParentPoint;//前驱节点
    Book *m_oBookInfo;//对应图书信息
    Info *m_pNextPoint;//后继节点

};

Book *InputNode(){
    //上传图书
    Book *p = new Book;//动态分配一片大小为sizeof(Book)字节的空间，并将该内存空间的起始位置赋值给p
    system("cls");//清屏
    fflush(stdin);//清楚以前的输入
    cout << "请输入图书编号："; cin >> p->m_nBook_Number;
    cout << "请输入图书："; cin >> p->m_strTitle;
    cout << "请输入作者："; cin >> p->m_strWroter;
    cout << "请输入当前在图书馆数量："; cin >> p->m_nMoreNum;
    cout << "请输入图书馆共计数量："; cin >> p->m_nTotalHoldNum;
    cout << "请输入图书介绍："; cin >> p->m_sttrComment;
    for(int i = 0; i < 20; i++){//初始化书本结构成员中相关读者指针内容为空
        (p->reader[i]).name = '\0';
    }
    return p;//返回成功读入的书本信息
}

Info *Sreach(Info *bth, int x, int *k, int *flag){
    //搜索图书
    Info *p = bth;
    *flag = 0;
    while(p){
        if(p->m_oBookInfo->m_nBook_Number == x){//寻到相同的图书编号
            *flag = 1;
            return p;
        }
        else {
            *flag = 0;
        }
        if(p->m_pNextPoint != NULL) {
            p = p->m_pNextPoint;
        }
        else{
            break;
        }
    }
    return bth;
}

Info *Insert_BookInfo(Info *bth){
    //上传图书
    int flag, k, x;
    cout << "请输入您想上传的图书编号：";//按照书本编号进行查找
    cin >> x;
    Info *p = Sreach(bth, x, &k, &flag);
    if(flag == 1){//找到直接对已有的数量进行修改
        cout << "当前图书馆内拥有这本书" << p->m_oBookInfo->m_nMoreNum << "本，您想在增加一本" << p->m_oBookInfo->m_strTitle << "书？(Y/N)" << endl;
        char ch;
        cin >> ch;
        if(ch == 'Y' || ch == 'y'){
            p->m_oBookInfo->m_nMoreNum++;
            p->m_oBookInfo->m_nTotalHoldNum++;
            cout << "增加后图书馆内拥有这本书" << p->m_oBookInfo->m_nMoreNum << "本，一共拥有" << p->m_oBookInfo->m_nTotalHoldNum << "本" << endl;
        }
        return bth;
    }
    //图书管内未找到这本图书编号
    Book * r = InputNode();
    if(bth == NULL){//当bth指针为空时，需要对其进行单独处理，链表表头内存的分配
        bth = new Info;
        bth->m_pParentPoint = NULL;
        bth->m_oBookInfo = r;
        bth->m_pNextPoint = NULL;
    }
    else {
        //说明存在头指针
        p = bth;
        while (p->m_pNextPoint != NULL)
            p = p->m_pNextPoint;
        Info *q = new Info;
        q->m_oBookInfo = r;
        q->m_pNextPoint = NULL;
        q->m_pParentPoint = p;
        p->m_pNextPoint = q;
    }
    return bth;
}

Info *Delete_BookInfo(Info * bth){
    //删除图书
    int flag, k, x;
    cout << "请输入您想删除的图书编号：";//按照书本编号进行查找
    cin >> x;
    Info *p = Sreach(bth, x, &k, &flag);
    if(flag == 0){//为查找图书编号
        cout << "图书馆内并没有这本书！！！" << endl;
        return bth;
    }
    else{
        if(p == NULL){//确保当前操作是有效的，防止出现非法操作
            cout << "查找错误" << endl;
            return bth;
        }
        else {
            cout << "你想删除的图书信息如下：" << endl;
            cout << "图书编号：" << p->m_oBookInfo->m_nBook_Number << endl;
            cout << "书名：" << p->m_oBookInfo->m_strTitle << endl;
            cout << "作者：" << p->m_oBookInfo->m_strWroter << endl;
            cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum << endl;
            cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum << endl;
            cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
            cout << "您确定删除吗？(Y/N)" << endl;
            char ch;
            cin >> ch;
            if(ch == 'Y' || 'y'){
                if(p->m_pNextPoint != NULL && p->m_pParentPoint != NULL){//夹在链表中间的节点
                    Info *Left = p->m_pParentPoint;//将要删除节点的前驱节点指向赋值给前驱结点指针变量
                    Info *Right = p->m_pNextPoint;//将要删除节点的后继结点指向赋值给后继结点指针变量
                    Left->m_pNextPoint = Right;//将后继结点指针指向的地址作为前驱结点的后继域
                    Right->m_pParentPoint = Left;//将前驱结点指针指向的地址作为后继结点的前驱域
                    //释放空间
                    p->m_pNextPoint = NULL;
                    p->m_pParentPoint = NULL;
                    delete p->m_oBookInfo;
                    p->m_oBookInfo = NULL;
                    delete p;
                    p = NULL;
                    return bth;
                }
                else if(p->m_pParentPoint == NULL){//首结点的前驱为空，处理首结点删除操作
                    if(p->m_pNextPoint == NULL){//说明只有一个结点
                        delete p->m_oBookInfo;
                        p->m_oBookInfo = NULL;
                        delete p;
                        p = NULL;
                        return bth;
                    }
                    bth = p->m_pNextPoint;
                    bth->m_pParentPoint = NULL;

                    p->m_pNextPoint = NULL;
                    p->m_pParentPoint = NULL;
                    delete p->m_oBookInfo;
                    p->m_oBookInfo = NULL;
                    delete p;
                    p = NULL;
                    return bth;
                }
                else if(p->m_pNextPoint == NULL){
                    Info *Left = p->m_pParentPoint;
                    Left->m_pNextPoint = NULL;

                    p->m_pNextPoint = NULL;
                    p->m_pParentPoint = NULL;
                    delete p->m_oBookInfo;
                    p->m_oBookInfo = NULL;
                    delete p;
                    p = NULL;
                    return bth;
                }
            }
        }
    }
}

void Output_BookInfo(Info * bth){
    //输出图书信息
    system("cls");
    Info *p = bth;
    while (p){
        cout << "图书编号：" << p->m_oBookInfo->m_nBook_Number;
        cout << "书名：" << p->m_oBookInfo->m_strTitle;
        cout << "作者：" << p->m_oBookInfo->m_strWroter;
        cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum;
        cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum;
        cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
        p = p->m_pNextPoint;
    }
}

void Borrow_TheBook(Info *bth){
    //图书借出
    system("cls");
    int flag, k, x, i = 0;
    cout << "请输入您想借阅的图书编号：";//按照书本编号进行查找
    cin >> x;
    Info *p = Sreach(bth, x, &k, &flag);
    if(flag == 1){
        Book *r = p->m_oBookInfo;
        cout << "你想借阅的图书信息如下：" << endl;
        cout << "书名：" << p->m_oBookInfo->m_strTitle << endl;
        cout << "作者：" << p->m_oBookInfo->m_strWroter << endl;
        cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum << endl;
        cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum << endl;
        cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
        cout << "您确定借阅吗？(Y/N)" << endl;
        char ch;
        cin >> ch;
        if(ch == 'Y' || ch == 'y'){
            if(r->m_nMoreNum == 0) cout << "对不起，本书 已经全部借出···" << endl;
            else{
                system("cls");
                for(i = 0; i < 20; i++)
                    if((r->reader[i]).name[0] == '\0') break;
                cout << "请输入借阅者的姓名：";cin >> (r->reader[i]).name;
                cout << "请输入借出日期：" << endl;
                cout << "请输入借出年份：";cin >> (r->reader[i]).bro.m_nYear;
                cout << "请输入借出月份：";cin >> (r->reader[i]).bro.m_nMonth;
                cout << "请输入借出日：";cin >> (r->reader[i]).bro.m_nDay;
                cout << "请输入归还日期：" << endl;
                cout << "请输入归还年份：";cin >> (r->reader[i]).back.m_nYear;
                cout << "请输入归还月份：";cin >> (r->reader[i]).back.m_nMonth;
                cout << "请输入归还日：";cin >> (r->reader[i]).back.m_nDay;
                r->m_nMoreNum--;
                cout << endl << "成功接到这本书" << endl;
            }
        }
    }
}

void TurnBack_TheBook(Info *bth){
    //图书归还
    system("cls");
    int flag, k, x, i = 0, j = 0;
    cout << "请输入您想借阅的图书编号：";//按照书本编号进行查找
    cin >> x;
    Info *p = Sreach(bth, x, &k, &flag);
    if(flag == 1){
        Book *r = p->m_oBookInfo;
        cout << "你想归还的图书信息如下：" << endl;
        cout << "书名：" << p->m_oBookInfo->m_strTitle << endl;
        cout << "作者：" << p->m_oBookInfo->m_strWroter << endl;
        cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum << endl;
        cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum << endl;
        cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
        cout << "您确定归还吗？(Y/N)" << endl;
        char ch;
        cin >> ch;
        if(ch == 'Y' || ch == 'y'){
            system("cls");
            cout << "请输入借阅者的姓名：";
            string nm;
            cin >> nm;
            for(i = 0; i < 20; i++)
                if((r->reader[i]).name == nm) {
                    j = 1;
                    break;
                }
            if(j == 0) {
                cout << "你未借阅过这本书" << endl;
                return;
            }
            (r->reader[i]).name[0] = '\0';
            r->m_nMoreNum++;
            cout << "书名：" << p->m_oBookInfo->m_strTitle << endl;
            cout << "作者：" << p->m_oBookInfo->m_strWroter << endl;
            cout << "当前在馆图书数量：" << p->m_oBookInfo->m_nMoreNum << endl;
            cout << "图书共计数量：" << p->m_oBookInfo->m_nTotalHoldNum << endl;
            cout << "这本图书简介：" << p->m_oBookInfo->m_sttrComment << endl;
        }
    }
    else cout << "您不能归还不存在的图书" << endl;
}

int  Select_Menu(){
    //图书管理系统主界面
    cout << "--------------------------------------------------" << endl << endl;
    cout << "              图  书  馆  管  理  系  统             " << endl;
    cout << "                     主  菜  单                     " << endl << endl;
    cout << "                    1.上传图书" << endl;
    cout << "                    2.下架图书" << endl;
    cout << "                    3.显示图书" << endl;
    cout << "                    4.借阅图书" << endl;
    cout << "                    5.归还图书" << endl;
    cout << "                    6.退出系统" << endl << endl;
    cout << "               请选择菜单项：（1-6）" << endl;
    cout << "--------------------------------------------------" << endl;
    int id = 0;//编号
    cout << "请输入您的选择：";
    cin >> id;
    return id;
}

int main(){
    Info *bth = NULL;
    while(true){
        int id = Select_Menu();
        switch (id) {
            case 1:
                bth = Insert_BookInfo(bth);
                break;
            case 2:
                bth = Delete_BookInfo(bth);
                break;
            case 3:
                Output_BookInfo(bth);
                break;
            case 4:
                Borrow_TheBook(bth);
                break;
            case 5:
                TurnBack_TheBook(bth);
                break;
            case 6:
                system("cls");
                cout << "您确定要退出系统（Y/N）";
                char t;
                cin >> t;
                if(t == 'y' || t == 'Y') exit(0);
                break;
        }
        cout << "按任意键返回主菜单.......";
    }
}

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