就快要交了...谁能帮帮我啊...设计一个图书管理系统...只要能运行就可以了...求命啊~~~~

#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>//输入/输出文件流类
using namespace std;
const int Maxr=100;//最多的读者
const int Maxb=100;//最多的图书
const int Maxbor=5;//每位读者最多借五本书
//读者类,实现对读者的信息的描述


class Reader
{
private:
    int tag; //删除标记 1:已删 0:未删
    int no; //读者编号
    char name[10]; //读者姓名
    int borbook[Maxbor];//所借图书
public:
    Reader() {}
    char *getname() {return name;} //获取姓名
    int gettag() {return tag;} //获取删除标记
    int getno() {return no;} //获取读者编号
    void setname(char na[]) //设置姓名
    {
        strcpy(name,na);
        
    }
    void delbook(){ tag=1; }//设置删除标记 1:已删 0:未删
    void addreader(int n,char *na)//增加读者
    {
        tag=0;
        no=n;
        strcpy(name,na);
        for(int i=0;i<Maxbor;i++)
            borbook[i]=0;
    }
    void borrowbook(int bookid)//借书操作
    {
        for(int i=0;i<Maxbor;i++)
        {
            if (borbook[i]==0)
            {
                borbook[i]=bookid;
                return;
               
            }
        }
        
    }
    int retbook(int bookid)//还书操作
    {
        for(int i=0;i<Maxbor;i++)
        {
            if(borbook[i]==bookid)
            {
                borbook[i]=0;
                return 1;
               
            }
        }
        return 0;
    }
    void disp()//读出读者信息
    {
        cout << setw(5) << no <<setw(10) << name<<"借书编号：[";
        for(int i=0;i<Maxbor;i++)
            if(borbook[i]!=0)
                cout << borbook[i] << "|";
            cout << "]"<<endl;
            
    }
};

//读者类库，实现建立读者的个人资料
class RDatabase
{
private:
    int top; //读者记录指针
    Reader read[Maxr];//读者记录
public:
    RDatabase() //构造函数，将reader.txt读到read[]中
    {
        Reader s;
        top=-1;
        fstream file("reader.txt",ios::in);//打开一个输入文件
        while (1)
        {
            file.read((char *)&s,sizeof(s));
            if (!file)break;
            top++;
            read[top]=s;
        }
        file.close(); //关闭 reader.txt
    }
    void clear()//删除所有读者信息
    {
        top=-1;
    }
    int addreader(int n,char *na)//添加读者时先查找是否存在
    {
        Reader *p=query(n);
        if (p==NULL)
        {
            top++;
            read[top].addreader(n,na);
            return 1;
        }
        return 0;
        
    }
    Reader *query(int readerid)//按编号查找
    {
        for (int i=0;i<=top;i++)
            if (read[i].getno()==readerid &&
                read[i].gettag()==0)
            {
                return &read[i];
            }
            return NULL;
    }
    void disp() //输出所有读者信息
    {
        for (int i=0;i<=top;i++)
            read[i].disp();
    }
    void readerdata();//读者库维护
    ~RDatabase() //析构函数，将read[]写到reader.txt文件中
    {
        fstream file("reader.txt",ios::out);
        for (int i=0;i<=top;i++)
            if (read[i].gettag()==0)
                file.write((char *)&read[i],sizeof(read[i]));
            file.close();
            
    }
};
void RDatabase::readerdata()
{
   
    char choice;
    char rname[20];
    int readerid;
    Reader *r;
    while (choice!='0')
    {
        cout <<"\n\n\t\t\t读 者 维 护\n\n\n\t\t 1 新 增\n\n\t\t 2 更 改\n\n\t\t 3 删 除\n\n\t\t 4 查 找\n\n\t\t 5 显 示\n\n\t\t 6 全 删\n\n\t\t 0 退 出"<<endl;
        cin >> choice;
        switch (choice)
        {
        case '1':
            cout << "输入读者编号:";
            cin >> readerid;
            cout << "输入读者姓名:";
            cin >> rname;
            addreader (readerid,rname);
            break;
        case '2':
            cout << "输入读者编号:";
            cin >> readerid;
            r=query(readerid);
            if (r==NULL)
            {
                cout << " 该读者不存在 "<<endl;
                break;
            }
            cout << "输入新的姓名:";
            cin >> rname;
            r->setname(rname);
            break;
        case '3':
            cout << " 输入读者编号:";
            cin >> readerid;
            r=query(readerid);
            if (r==NULL)
            {
                cout <<" 该读者不存在" << endl;
                break;
            }
            r->delbook();
            break;
        case '4':
            cout << "读入读者编号:";
            cin >> readerid;
            r=query(readerid);
            if (r==NULL)
            {
                cout <<"该读者不存在"<< endl;
                break;
            }
            r->disp();
            break;
        case '5':
            disp();
            break;
        case '6':
            clear();
            break;
        default:cout<<"输入错误，请从新输入：";break;
        }
    }
}


//图书类，实现对图书的描述，图书的编号，书名，借出，还入等
class Book
{
private:
    int tag;//删除标记 1:已删 0:未删
    int no;//图书编号
    char name[20];//书名
    int onshelf;//是否再架 1:再架 2:已借
public:
    Book(){}
    char *getname() { return name; }//获取姓名
    int getno(){ return no; }//获取图书编号
    int gettag(){ return tag; }//获取删除标记
    void setname(char na[])//设置书名
    {
        strcpy(name,na);
    }
    void delbook(){ tag=1;}//删除图书
    void addbook(int n,char *na)//增加图书
    {
        tag=0;
        no=n;
        strcpy(name,na);
        onshelf=1;
    }
    int borrowbook()//借书操作
    {
        if (onshelf==1)
        {
            onshelf=0;
            return 1;
        }
        return 0;
    }
    void retbook()//还书操作
    {
        onshelf=1;
    }
    void disp()//输出图书
    {
        cout << setw(6) << no << setw(18) << name << setw(10)
            <<(onshelf==1? "在架":"已借") <<endl;
    }
};


//图书库类，实现对图书的维护，查找，删除等
class BDatabase
{
private:
    int top; //图书记录指针
    Book book[Maxb]; //图书记录
public:
    BDatabase()//构造函数，将book.txt读到book[]中
    {
        Book b;
        top=-1;
        fstream file("book.txt",ios::in);
        while (1)
        {
            file.read((char *)&b,sizeof(b));
            if (!file) break;
            top++;
            book[top]=b;
        }
        file.close();
    }
    void clear()//全删
    {
        top=-1;
    }
    int addbook(int n,char *na)//增加图书
    {
        Book *p=query(n);
        if (NULL==p)
        {
            top++;
            book[top].addbook(n,na);
            return 1;
        }
        return 0;
    }
    Book *query(int bookid)//查找图书
    {
        for (int i=0;i<=top;i++)
            if (book[i].getno()==bookid &&book[i].gettag()==0)
            {
                return &book[i];
            }
            return NULL;
    }
    void bookdata();//图书库维护
    void disp()
    {
        for (int i=0;i<=top;i++)
            if (book[i].gettag()==0)
                book[i].disp();
    }
    ~BDatabase()//析构函数，将book[]写到book.txt文件中
    {
        fstream file("book.txt",ios::out);
        for (int i=0;i<=top;i++)
            if (book[i].gettag()==0)
                file.write((char *)&book[i],sizeof(book[i]));
            file.close();
    }
};
void BDatabase::bookdata()
{
    char choice;
    char bname[40];
    int bookid;
    Book *b;
    while (choice!='0')
    {
        cout <<"\n\n\n\t\t\t图 书 维 护 "<<endl<<endl;
        cout<<"\t\t1 新 增\n \t\t2 更 改\n\t\t3 删 除\n\t\t4 查 找\n\t\t5 显 示\n\t\t6 全 删\n\t\t0 退 出"<<endl;
        cin >> choice;
        switch (choice)
        {
        case '1':
            cout << "输入图书编号:"<<endl;
            cin >> bookid;
            cout << "输入图书书名:"<<endl;
            cin >> bname;
            addbook(bookid,bname);
            break;
        case '2':
            cout << "输入图书编号:"<<endl;
            cin >> bookid;
            b=query(bookid);
            if (b==NULL)
            {
                cout << " 该图书不存在 "<<endl;
                break;
            }
            cout << "输入新的书名:"<<endl;
            cin >> bname;
            b->setname(bname);
            break;
        case '3':
            cout <<" 读入图书编号:"<<endl;
            cin >> bookid;
            b=query(bookid);
            if (b==NULL)
            {
                cout <<" 该图书不存在" << endl;
                break;
            }
            b->delbook();
            break;
        case '4':
            cout << " 读入图书编号:"<<endl;
            cin >> bookid;
            b=query(bookid);
            if (b==NULL)
            {
                cout <<" 该图书不存在"<< endl;
                break;
            }
            b->disp();
            break;
        case '5':
            disp();
            break;
        case '6':
            clear();
            break;
        default:cout<<"输入错误，请从新输入:";
        }
    }
}

//main() 函数的实现，程序的主界面的引导

void main()
{
    char choice;
    int bookid,readerid;
    RDatabase ReaderDB;
    Reader *r;
    BDatabase BookDB;
    Book *b;
    while(choice!='0')
    {
        cout <<endl<<endl<<"\t\t\t 图 书 管 理 系 统\n\n\n";
        
        
        cout <<"\t\t\t1 借 书\n\n\t\t\t2 还 书 \n\n\t\t\t3 图 书 维 护\n\n\t\t\t4 读 者 维 护\n\n\t\t\t0 离 开"<<endl;
        cin >> choice;
        switch (choice)
        {
        case '1':
            cout <<" 借书 读者编号:";
            cin >>readerid;
            cout <<" 图书编号： ";
            cin >>bookid;
            r=ReaderDB.query(readerid);//按编号查找
            if (NULL==r)
            {
                cout <<" 不存在该读者，不能借书"<< endl;
                break;
            }
            b=BookDB.query(bookid);
            if (b==NULL)
            {
                cout <<" 不存在该图书，不能借书"<< endl;
                break;
            }
            if (b->borrowbook()==0)
            {
                cout << " 该图书已借出，不能借书"<< endl;
                break;
            }
            r->borrowbook(b->getno());
            break;
        case '2':
            cout<<"还书\n 读者编号:";
            cin >>readerid;
            cout << " 图书编号:";
            cin >>bookid;
            r=ReaderDB.query(readerid);
            if (r==NULL)
            {
                cout <<" 不存在该读者，不能还书" << endl;
                break;
            }
            b=BookDB.query(bookid);
            if (b==NULL)
            {
                cout <<" 不存在该图书，不能还书" <<endl;
                break;
            }
            b->retbook();
            r->retbook(b->getno());
            break;
        case '3':
            BookDB.bookdata();
            break;
        case '4':
            ReaderDB.readerdata();
            break;
        default:cout<<"输入错误，请从新输入：";
            
        }
    }
}