C++ Program For Library Management System

#include<iostream>

#include <string>

#include <fstream>

using namespace std;

ofstream outfile;

ifstream infile;

int fine = 100;

string user_name[50] ;

int lib_no;

string author_name[50];

string book_name[50];

int date_of_submission[50];

int date_of_publication[50];

int return_date[50];        //date to return book

int returned_date[50];     // date a person retuerned

class user

{

public:

       int getdata()

       {

       system("CLS");

              outfile.open("D:\myFile.txt",ios_base::app);

         cout<<"\nEnter the library number of user:\t";

         cin>>lib_no;

         outfile << endl;

         outfile << lib_no << endl;

         cout<<"\nEnter the name of user:\t";

         cin.ignore();

         getline(cin,user_name[lib_no]);

         outfile << user_name[lib_no] << endl;

         return lib_no;

       }

       void putdata(int lib)

       {

         cout<<"The name of user is:"<<user_name[lib]<<endl;

         cout<<"The library number of user is:"<<lib<<endl;

      

       }

};

class book :public user

{

private:

      

public:

       int getdata()

       {

         int lib = user::getdata();

         cout<<"\n\n*\\Book Details Are \\*";

         cout<<endl;

         cout<<"\nEnter the name of a book:\t";

        

         getline(cin,book_name[lib]);

         outfile << book_name[lib] << endl;

         cout<<"\nEnter the name of author:\t";

        

         getline(cin,author_name[lib]);

         outfile << author_name[lib] << endl;

         cout<<"\nEnter the year of publication:\t";

        

         cin>>date_of_publication[lib];

         outfile << date_of_publication[lib] << endl;

         cout<<"\nEnter date of book issued:\t";

         cin.ignore();

         cin>>date_of_submission[lib];

         outfile << date_of_submission[lib] << endl;

         cout<<"\nEnter return date of a book:\t";

         cin.ignore();

         cin>>return_date[lib];

         outfile << return_date[lib] << endl<<endl;

         outfile.close();

         return lib;

       }

       void putdata(int lib)

       {

               user::putdata(lib);

              cout<<"\n\n*\\BOOK DETAILS ARE\\*" ;

              cout<<endl;

              cout<<"\nThe name of a book is: "<<book_name[lib]<<endl;

              cout<<"\nThe name of author is: "<<author_name[lib]<<endl;

              cout<<"\nThe year of publication is: "<<date_of_publication[lib]<<endl;

           cout<<"\nThe date of submission of a book is: "<<date_of_submission[lib]<<endl;

              cout<<"\nThe return date of book is: "<<return_date[lib]<<endl;

       }

};

class late:public book

{

public:

              string line;

           int pay;

              int offset;

             

              int getdata()

              {

              cout<<"Enter Library No:";

              cin>>lib_no;

              cout<<"Enter Date of Book returned: ";

              cin>>returned_date[lib_no];

              if(return_date[lib_no]==0)

              {

                     cout<<"\n\n No person exist with this library number\n\n";

                     return 0;

              }

              else

              {

                     int late_date = returned_date[lib_no] - return_date[lib_no];

                     pay = fine * late_date;

                     return pay;

              }

              }

              void putdata(int fine)

              {

           cout<<fine<<endl;

        }

};

void main()

{

int choice,y;

book b1;

user u1;

late l1;

int lib;

int fine;

for(int i = 0; i <50;i++){return_date[i]=0;}

XYZ:

cout<<"\n\n*****************************************\n";

cout<<"*\tWant to issue book.. PRESS : 1"<<endl;

cout<<"*\tWant to return book..PRESS : 2"<<endl;

cout<<"*\tFor exit        ..   PRESS : 3"<<endl;

cout<<"\n*****************************************\n\n";

cout<<"Enter a choice:\t";

cin>>choice;

switch (choice )

       {

    case 1:

              cout<<"*\\USER DETAILS ARE\\*" ;

              cout<<endl;

             

              lib = b1.getdata();

              cout<<endl;

              system("CLS");

              cout<<endl;

              cout<<endl;

              cout<<"...*\\ Showing User and Book Details\\*...\n";

              cout<<endl;

              cout<<"\n*\\USER DETAILS ARE\\*\n\n" ;

              cout<<endl;

              b1.putdata(lib);

              cout<<endl;

         break;

       case 2:

              cout<<"*\\BOOK Returned DETAILS ARE\\*";

              cout<<endl;

              fine = l1.getdata();

              cout<<endl;

              if(fine!=0){        

              cout<<"Payable Fine is=";

              l1.putdata(fine);

              cout<<endl;}

        break;

       case 3:

           system("pause");

              exit(1);

        break;

       default:

       cout<<("invalid choice");

   }

cout<<"Show main menu again,,";

cout<<"press 1:\t";

cin>>y;

system("CLS");

if(y==1)

{

 goto XYZ;

}

system("pause");

}