简单图书管理系统

// Library_botao.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#define ElemType Book   //宏定义
#define LIST_INT_SIZE 1 //改为1,改用ListInsert增加空间
#include <iostream>
#include <string.h>
#include <stdio.h>
#include "malloc.h"
#include <fstream>
using namespace std;
void bookFirst();  //先初始化书籍
void bookOut();    //输出
//定义一个结构体,表示书籍的信息
struct Book
    {
    int bookId;
    char bookName[20];
    char bookAuthor[20]; //作者
    int bookCount;
    //char bookLender[20];  //借阅者
    };
//每次初始化书籍时,给定一本书固定的bookId号,不会改变  //同一种书用同一个书号
/************************************************************************/
/* 定义线性表,用于对图书号建索引,加快查询速度                                                                     */
/************************************************************************/
//定义一个顺序表
struct Sqlist{           
    ElemType *elem;
    int length;
    int listsize;
    }L={NULL,0,0};
//定义一个枚举类型,让所有的函数返回一个枚举类型的结果
enum status
    {
    OK,FAILED,EMPTY,NOTINIT,OVERFLOW1,NULLHEAD//OVERFLOW在visual studio无法使用,改为OVERFLOW1
    };
void bookFirst()
    {
          
        ofstream of("book.dat",ios::out|ios::binary);  //定义文件输出流,文件不存在时创建文件
        if (!of)
            {
            cout<<"The file open error!"<<endl;
            }
        else
            {
                Book *book=new Book;
                cout<<"bookId:";
                cin>>book->bookId;
                cout<<"bookName:";
                cin>>book->bookName;
                cout<<"bookAuthor:";
                cin>>book->bookAuthor;
                cout<<"bookCount:";
                cin>>book->bookCount;
                of.write((char*)book,sizeof(Book));
            }
        of.close();
        ofstream of1("book.dat",ios::app|ios::binary);
        Book *book1=new Book;
        cout<<"bookId:";
        cin>>book1->bookId;
        cout<<"bookName:";
        cin>>book1->bookName;
        cout<<"bookAuthor:";
        cin>>book1->bookAuthor;
        cout<<"bookCount:";
        cin>>book1->bookCount;
        of1.write((char*)book1,sizeof(Book));
        of1.close();
    }
void bookOut()
    {
        ifstream inFile("book.dat",ios::in|ios::binary);
        if (! inFile)
        {
            cout<<"The file open error"<<endl;
        }
        else
            {
            Book *b=new Book;
            inFile.read((char*)b,sizeof(Book));
            cout<<"bookId:"<<b->bookId;
            cout<<" "<<"bookNname:"<<b->bookName;
            cout<<" "<<"bookAuthor:"<<b->bookAuthor;
            cout<<" "<<"bookCunt:"<<b->bookCount;
            cout<<endl;
            }
        inFile.close();
    }
/************************************************************************/
/* 定义一个链式表进行对书籍信息的操作                                                                     */
/************************************************************************/
typedef struct Lnode
    {
        ElemType book;
        struct Lnode *next;
    }Lnode, *LinkList;
//单链表初始化
LinkList LinkListInit()
    {
        LinkList head;
          
        head=(Lnode *)malloc(sizeof(Lnode));
        if (NULL==head)
        {
            cout<<"error:申请空间失败!"<<endl;
        }
        head->next=NULL;
        strcpy((head->book).bookName,"");   //初始化头结点
        (head->book).bookCount=0;
        (head->book).bookId=0;
    //  cout<<"LinkList已初始化......."<<endl;
        return head;
    }
 //创建单链表 ,增加元素    //将文件中的书籍信息初始化到链表中 。。。。然后再进行操作
status LinkList_Creat(LinkList head,ElemType e)
    {
          
         LinkList q;
         q=head;
         while(q->next!=NULL)    //让指针指到最后
             q=q->next;
         //ElemType e;   //从文件中读取     for循环
         ifstream inFile("book.dat",ios::in|ios::binary);
         if (!inFile)
         {
            cout<<"Open File error!"<<endl;
         }
         else
             {
                Book *b=new Book;
                while(inFile.read((char *)b,sizeof(Book)))
                    {
                        q->next=(Lnode *)malloc(sizeof(Lnode));
                        strcpy(q->next->book.bookName,b->bookName);
                        strcpy(q->next->book.bookAuthor,b->bookAuthor);
                        q->next->book.bookId=b->bookId;
                        q->next->book.bookCount=b->bookCount;
                        b=new Book;
                        q=q->next;
                        q->next=NULL;
                    }
                inFile.close();
             }
         return OK;
    }
status search(LinkList head,ElemType e)     //查询书籍
    {
         LinkList q;
         q=head;
         int n=0;
         while(NULL!=q->next)
             {
                if (strcmp(q->next->book.bookName,e.bookName)==0)
                {
                    n++;
                    cout<<"您要查询的书籍为:"<<endl;
                    cout<<q->next->book.bookId<<" "<<q->next->book.bookId<<" "<<q->next->book.bookAuthor<<" "<<q->next->book.bookCount<<endl;
                }
                q=q->next;
             }
         if (n==0)
         {
            cout<<"不好意思,本馆暂时没有你们要借的书。。。。。。。。。。。。"<<endl;
         }
         return OK;
    }
//增加一本新书
status LinkList_Add(LinkList head,ElemType e)
    {
        //遍历链表,在表的最后直接加上
          
        LinkList q;
        q=head;
        int n=0; //判断图书馆是否已有该书的记录
        while(q->next!=NULL)
            {
                if (strcmp(q->next->book.bookName,e.bookName)==0)
                {
                    n++;
                    q->next->book.bookCount++;
                }
                q=q->next;
            }
        if (n==0)                      //说明以前图书馆不存在该书
        {
            q->next=(Lnode *)malloc(sizeof(Lnode));     
            q->next->book=e;
            q->next->book.bookCount=1;  //图书馆有了这样的书 1本
        }
        q->next->next=NULL;
        return OK;
    }
//借书
status LinkList_Lend(LinkList head, ElemType e)
    {
        //遍历链表看要借的书是否在管中,若在,返回书籍,不在返回信息
        LinkList q;
        q=head;
        int n=0;
        while(q->next!=NULL)
            {
                if (strcmp(q->next->book.bookName,e.bookName)==0)
                {
                    n++;
                    if (q->next->book.bookCount>0)    //图书馆中还有该书,返回该书信息,修改书籍信息
                    {
                        q->next->book.bookCount--;
                        cout<<"您要借的书:"<<q->next->book.bookId<<" "<<q->next->book.bookName<<" "<<q->next->book.bookAuthor<<endl;
                    }
                    else
                        {
                            cout<<"不好意思,您要的书已被别人借走。。。。。。"<<endl;
                        }
                }
//              else{
//                      cout<<"不好意思,您要的书本馆暂时没有。。。。"<<endl;
//                  }
                q=q->next;
            }
        if (n==0)
        {
            cout<<"不好意思,您要的书本馆暂时没有。。。。"<<endl;
        }
        return OK;
          
    }
//还书
status LinkList_Return(LinkList head,ElemType e)
    {
        //遍历链表找到该书籍的信息,然后修改
        LinkList q;
        q=head;
        int n=0; //记录本本馆中是否有该书籍
        while(NULL!=q->next)
            {
                  if (strcmp(q->next->book.bookName,e.bookName)==0)
                  {
                        n++;
                        q->next->book.bookCount++;
                  }
                  q=q->next;
            }
        if (n==0)
        {
        cout<<"对不起,您借的书不是本馆的书........"<<endl;
        }
        return OK;
    }
//输出单链表的元素
status LinkList_Cout(LinkList head)
    {
          
        if (NULL==head->next)
        {
            cout<<"单链表中没有元素!"<<endl;
            return NULLHEAD;
        }
        LinkList p;
        p=head->next;
        int i=0;
        while(NULL!=p)
            {          
                cout<<i++<<"..."<<p->book.bookId<<" "<<p->book.bookName<<" "<<p->book.bookAuthor<<" "<<p->book.bookCount<<endl;
                p=p->next;
            }
    }
status AddFile(LinkList head)       //将修改后的图书馆信息重新写回文件
    {
        ofstream outf("book.dat",ios::out|ios::binary);  //打开文件输出流
        LinkList p;
        p=head;
        if (!outf)
        {
            cout<<"Open Flie error......"<<endl;
        }
        else
            {  
                outf.seekp(0);     //将文件指针定位到文件头部
                Book *b=new Book;
                while(NULL!=p->next)
                    {
                         (*b)=p->next->book;   //将链表中的Book信息赋给(*b)
                         outf.write((char *)b,sizeof(Book));
                           
                         b=new Book;
                         p=p->next;
                    }
                outf.close();
            }
        return OK;
    }
status select_L(LinkList head)         //系统选择函数
    {
    //InitList_sq(L,5);      //线性表完成加载
    //ListInput_Sq(L);
      
    cout<<"                             Welcome to Library"<<endl;
    cout<<"*********************************************************"<<endl;
    cout<<"查看图书里的书.......请输入1:"<<endl;
    cout<<"查询图书里的书.......请输入2:"<<endl;
    cout<<"借书.................请输入3:"<<endl;
    cout<<"还书.................请输入4:"<<endl;
    cout<<"新书采编入库.........请输入5:"<<endl;
    cout<<"退出.................请输入6:" <<endl;
    cout<<"*********************************************************"<<endl;
    int n;  //输入n ,通过n的值来判断执行什么操作
    cin>>n;
    cout<<endl;
    switch(n)
        {
    case 1:
        //查看图书馆里的书。。。。。。。。
        LinkList_Cout(head);
      
         select_L(head);
        break;
    case 2:
        //查询书籍。。。。。。。。
        ElemType  book;
        cout<<"请输入您要查询的书的名字:"<<endl;
        cin>>book.bookName;
        search(head ,book);
        select_L(head);
        break;
    case 3:
        //借书  。。。。。。。。。
        cout<<"请输入您要借的书的名字:"<<endl;
          
        cin>>book.bookName;
        LinkList_Lend(head,book);
        AddFile(head);  //将借书后的书籍信息重新再写到文件中
         select_L(head);
        break;
    case 4:
        //还书 。。。。。。。。。。。
        cout<<"请输入您想还的书的名字:"<<endl;
        //ElemType book1;
        cin>>book.bookName;
        LinkList_Return(head,book);
        AddFile(head);
        select_L(head);
        break;
    case 5:
        //新书采编入库...............
        cout<<"输入新书的名字和书号:"<<endl;
        cout<<"bookId:"<<endl;
        cin>>book.bookId;
        cout<<"bookName:"<<endl;
        cin>>book.bookName;
        cout<<"bookAuthor:"<<endl;
        cin>>book.bookAuthor;
        LinkList_Add(head,book);
        AddFile(head);
        select_L(head);
        break;
    case 6:
        exit(0);
        break;
    default:
        break;
        }
    return OK;
    }
int main()
    {
          
    //      bookFirst();
    //      bookOut();
        LinkList head=LinkListInit();   //初始化一个带头结点的链表
        ElemType e;
        strcpy(e.bookName,"J+++");
        strcpy(e.bookAuthor,"boo");
        e.bookId=1001;
        e.bookCount=1;
        LinkList_Creat(head,e);
        cout<<"图书馆信息已加载........."<<endl;
          
        select_L(head);  //对图书馆执行操作函数
        return 0;
    }