一个简易的图书馆管理系统

有4个类，分别对图书和读者信息进行管理；

由对象指针调用各个函数。

#include <iostream>
#include <iomanip>
#include <cstring>
#include <fstream>
#include <stdlib.h>
using namespace std;
const int Reader=100;
const int Maxb=100;
const int Bor=5;
class Student
{
private:
    int tag;
    int number;
    char name[10];
    int borbook[Bor];
public:
    Student() { }
    char *getname()
    {
        return name;
    }
    int gettag()
    {
        return tag;
    }
    int getnumber()
    {
        return number;
    }
    void setname(char *na)
    {
        strcpy(name,na);
    }
    void delbook()
    {
        tag=1;
    }
    void addStudent(int n,char *na)
    {
        tag=0;
        number=n;
        strcpy(name,na);
        for(int i=0; i<Bor; i++)
            borbook[i]=0;
    }
    void borrowbook(int bookid)//借书操作
    {
        for(int i=0; i<Bor; i++)
        {
            if (borbook[i]==0)
            {
                borbook[i]=bookid;
                return;
            }
        }
    }
    int retbook(int bookid)//还书操作
    {
        for(int i=0; i<Bor; i++)
        {
            if(borbook[i]==bookid)
            {
                borbook[i]=0;
                return 1;
            }
        }
        return 0;
    }
    void output()//读出读者信息
    {
        cout << setw(5) << number <<setw(10) << name<<"借书编号：[";
        for(int i=0; i<Bor; i++)
            if(borbook[i]!=0)
                cout << borbook[i] << "|";
        cout << "]"<<endl;
    }
};
class RData
{
private:
    int top; //读者记录指针
    Student read[Reader];
public:
    RData() //构造函数，将Student.txt读到read[]中
    {
        Student s;
        top=-1;
        fstream file("Student.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();
    }
    void clear()
    {
        top=-1;
    }
    int addStudent(int n,char *na)//查找是否存在
    {
        Student *p=equal(n);
        if (p==NULL)
        {
            top++;
            read[top].addStudent(n,na);
            return 1;
        }
        return 0;
    }
    Student *equal(int Studentid)//按编号查找
    {
        for (int i=0; i<=top; i++)
            if (read[i].getnumber()==Studentid &&
                    read[i].gettag()==0)
            {
                return &read[i];
            }
        return NULL;
    }
    void output()
    {
        for (int i=0; i<=top; i++)
            read[i].output();
    }
    void Studentdata();//读者库维护
    ~RData() //析构函数，将read[]写到Student.txt文件中
    {
        fstream file("Student.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 RData::Studentdata()
{
    char choice;
    char rname[20];
    int Studentid;
    Student *r;
    while (choice!='0')
    {
        cout<<"                     ┏━━━━━━━━━━━━━┓\n";
        cout<<"                     ┃      读 者 维 护         ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃1.新 增                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃2.更 改                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃3.删 除                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃4.查 找                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃5.显 示                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃6.全 删                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃0.退出                    ┃\n";
        cout<<"                     ┗━━━━━━━━━━━━━┛\n";
        cin >> choice;
        switch (choice)
        {
        case '1':
            cout << "输入读者编号:";
            cin >> Studentid;
            cout << "输入读者姓名:";
            cin >> rname;
            addStudent (Studentid,rname);
            break;
        case '2':
            cout << "输入读者编号:";
            cin >> Studentid;
            r=equal(Studentid);
            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 >> Studentid;
            r=equal(Studentid);
            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 >> Studentid;
            r=equal(Studentid);
            if (r==NULL)
            {
                cout <<"该读者不存在"<< endl;
                break;
            }
            r->output();
            break;
        case '5':
            output();
            break;
        case '6':
            clear();
            break;
        default:
            cout<<"退出：\n";
            system("cls");
            break;
        }
    }
}
class Book
{
private:
    int tag;
    int number;
    char name[20];
    int onshelf;
public:
    Book() {}
    char *getname()
    {
        return name;
    }
    int getnumber()
    {
        return number;
    }
    int gettag()
    {
        return tag;
    }
    void setname(char na[])
    {
        strcpy(name,na);
    }
    void delbook()
    {
        tag=1;
    }
    void addbook(int n,char *na)
    {
        tag=0;
        number=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 output()//输出图书
    {
        cout << setw(6) << number << setw(18) << name << setw(10)
             <<(onshelf==1? "在架":"已借") <<endl;
    }
};
class BDatabase
{
private:
    int top;
    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()
    {
        top=-1;
    }
    int addbook(int n,char *na)
    {
        Book *p=equal(n);
        if (NULL==p)
        {
            top++;
            book[top].addbook(n,na);
            return 1;
        }
        return 0;
    }
    Book *equal(int bookid)
    {
        for (int i=0; i<=top; i++)
            if (book[i].getnumber()==bookid &&book[i].gettag()==0)
            {
                return &book[i];
            }
        return NULL;
    }
    void bookdata();
    void output()
    {

        for (int i=0; i<=top; i++)
            if (book[i].gettag()==0)
                book[i].output();
    }
    ~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";
        cout<<"                     ┃      图书 维 护          ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃1.新 增                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃2.更 改                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃3.删 除                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃4.查 找                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃5.显 示                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃6.全 删                   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃0.退出                    ┃\n";
        cout<<"                     ┗━━━━━━━━━━━━━┛\n";
        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=equal(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=equal(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=equal(bookid);
            if (b==NULL)
            {
                cout <<" 该图书不存在"<< endl;
                break;
            }
            b->output();
            break;
        case '5':
            output();
            break;
        case '6':
            clear();
            break;
        default:
            cout<<"退出\n";
            system("cls");
            break;
        }
    }
}
int main()
{
    char choice;
    int bookid,Studentid;
    RData StudentDB;
    Student *r;
    BDatabase BookDB;
    Book *b;
    while(choice!='0')
    {
        cout<<"                     ┏━━━━━━━━━━━━━┓\n";
        cout<<"                     ┃      图 书 管 理 系 统   ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃1.借书                    ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃2.还书                    ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃3.图书维护                ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃4.读者维护                ┃\n";
        cout<<"                     ┃━━━━━━━━━━━━━┃\n";
        cout<<"                     ┃0.退出                    ┃\n";
        cout<<"                     ┗━━━━━━━━━━━━━┛\n";
        cin >> choice;
        switch (choice)
        {
        case '1':
            system("cls");
            cout <<" 借书 读者编号:";
            cin >>Studentid;
            cout <<" 图书编号： ";
            cin >>bookid;
            r=StudentDB.equal(Studentid);//按编号查找
            if (NULL==r)
            {
                cout <<" 不存在该读者，不能借书"<< endl;
                break;
            }
            b=BookDB.equal(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->getnumber());
            system("cls");
            break;
        case '2':
            system("cls");
            cout<<"还书\n 读者编号:";
            cin >>Studentid;
            cout << " 图书编号:";
            cin >>bookid;
            r=StudentDB.equal(Studentid);
            if (r==NULL)
            {
                cout <<" 不存在该读者，不能还书" << endl;
                break;
            }
            b=BookDB.equal(bookid);
            if (b==NULL)
            {
                cout <<" 不存在该图书，不能还书" <<endl;
                break;
            }
            b->retbook();
            r->retbook(b->getnumber());
            break;
        case '3':
            system("cls");
            BookDB.bookdata();
            break;
        case '4':
            system("cls");
            StudentDB.Studentdata();
            break;
        default:
            cout<<"退出\n";
        }
    }
}