strcpy(book[topbook].writer,s.writer);
                        strcpy(book[topbook].print,s.print);
                        book[topbook].price=s.price;
                        book[topbook].flag=1;
                        writebtxt();
                        }
                        void delbook(int number)      //刪除圖書
                        {
                        readbtxt();
                        for(int i=0;i<topbook;i++)
                            if(book[i].number==number)
                        {
                        if(book[i].flag==0)
                        {
                        cout<<"此書已經借出，請還回時再刪除"<<endl;
                        return;
                        }
                        for(int j=i;j<topbook;j++)
                        {
                        book[j].number=book[j+1].number;
                        book[j].flag=1;
                        strcpy(book[j].name,book[j+1].name);
                        strcpy(book[j].writer,book[j+1].writer);
                        strcpy(book[j].print,book[j+1].print);
                        book[j].price=book[j+1].price;
                        };
                        topbook--;
                        writebtxt();
                        return;
                        }
                        if(book[topbook].number==number)topbook--;
                        else
                        {
                        cout<<"查無此書"<<endl;
                        return;
                        }
                        writebtxt();
                        }
                        void searchbook(int number)      //查找圖書
                        {
                        readbtxt();
                        for(int i=0;i<=topbook;i++)
                        if(book[i].number=number)
                        {
                                   cout<<"編號："<<book[i].number<<endl;
                           cout<<"狀態：";
                           if(book[i].flag==1)cout<<"書庫中存在"<<endl;
                           else cout<<"書已經借出"<<endl;
                             cout<<"書名："<<book[i].name<<endl;
                           cout<<"作者："<<book[i].writer<<endl;
                           cout<<"出版社："<<book[i].print<<endl;
                           cout<<"價格："<<book[i].price<<endl;
                           return;
                        }
                        cout<<"查無此書！"<<endl;
                        }
                        void bookdata()      //圖書管理
                        {
                        int choice,number;
                        libook s;
                        while(1)
                        {
                        cout<<"圖書維護   1：新增    2：刪除    3：查找    0:退出 "<<endl;
                        cin>>choice;
                        switch(choice)
                        {
                        case 0: return;
                        case 1: cout<<"輸入圖書編號:";
                        cin>>s.number;
                            cout<<"輸入圖書的名稱：";
                        cin>>s.name;
                        cout<<"輸入作者的姓名：";
                        cin>>s.writer;
                        cout<<"輸入出版社：";
                        cin>>s.print;
                        cout<<"輸入價格:";
                        cin>>s.price;
                        addbook(s);
                        break;
                        case 2: cout<<"輸入刪除圖書的編號";
                        cin>>number;
                        delbook(number);
                        break;
                        case 3: cout<<"輸入要查找的圖書的編號：";
                        cin>>number;
                        searchbook(number);
                        break;
                        default: cout<<"輸入錯誤！"<<endl;
                        break;
                        }
                        }
                        }
                        void borbook()
                        {
                        int number,numbers;
                        readbtxt();
                        readtxt();
                        cout<<"請輸入你的編號：";
                        cin>>numbers;
                        for(int i=0;i<=topreader;i++)
                            if(read[i].number==numbers)break;
                        if(i=topreader+1)
                        {
                        cout<<"沒有你的信息！"<<endl;
                        return;
                        }
                        for(int j=0;j<maxbor;j++)
                        if(read[i].borbook[j]==0)break;
                        if(j>maxbor-1)
                        {
                        cout<<"你所能借的書已經滿了！"<<endl;
                        return;
                        }
                        cout<<"請輸入要借的書的編號！"<<endl;
                        cin>>number;
                        for(int k=0;k<=topbook;k++)
                        if(book[k].number=number)
                        {
                                    if(book[k].flag=0)
                        {
                        cout<<"此書已經借出！";
                        return;
                        }
                        book[k].flag=0;
                        read[i].borbook[j]=number;
                        writetxt();
                        writebtxt();
                        return;
                        }
                        cout<<"此書不在，請重新借！"<<endl;
                        return;
                        }
                        void retbook()
                        {
                        int number,numbers;
                        readtxt();
                        readbtxt();
                        cout<<"請輸入你的編號:";
                        cin>>numbers;
                        for(int i=0;i<=topreader;i++)
                        {
                        if(read[i].number==numbers)break;
                        if(i=topreader+1)
                        {
                        cout<<"沒有你的信息!"<<endl;
                        return;
                        }
                        }
                        cout<<"請輸入要還的書的編號！";
                        cin>>number;
                        for(int n=0;n<=topbook;n++)
                        if(book[n].number=number)break;
                        if(n==topbook+1||book[n].flag==1)
                        {
                        cout<<"此書不為圖書管所有！"<<endl;
                        return;
                        };
                        for(int j=0;j<maxbor;j++)
                        if(read[i].borbook[j]=number)
                        {
                        for(int k=0;k<maxbor;k++)
                        if(read[i].borbook[k]=0)break;
                        k--;
                        for(int m=j+1;m<=k;m++)
                        {
                        read[i].borbook[j]=read[i].borbook[m];
                        j++;
                        }
                        read[i].borbook[j]=0;
                        book[n].flag=1;
                        writetxt();
                        writebtxt();
                        return;
                        }
                        if(j=maxbor)
                        {
                        cout<<"您沒有借過這本書"<<endl;
                        return;
                        }
                        }
                        void main()
                        {
                        int x=1,y=1;
                            cout<<"歡迎使用本圖書管理系統！"<<endl;
                        while(x!=0)
                        {
                        cout<<"請選擇目的    1：進入圖書管理系統    0：退出圖書管理系統"<<endl;
                        cin>>x;
                        switch(x)
                        {
                        case 1: while(y!=0)
                        {
                        cout<<"請選擇目的  1：借書    2：還書    3：圖書維護    4：讀者維護    
                        0：返回上一層"<<endl;
                        cin>>y;
                        switch(y)
                        {
                        case 1: borbook();break;
                        case 2: retbook();break;
                        case 3: bookdata();break;
                        case 4: readerdata();break;
                        case 0: break;
                        default:cout<<"輸入的不正確"<<endl;break;
                        }
                        };
                        break;
                        case 0: cout<<"歡迎再次使用BYEBYE！"<<endl;
                        return;
                        default :cout<<"輸入的不正確!"<<endl;
                        break;
                        }
                        }
                        }