A Library Management System is an enterprise resource planning system for a library, used to track items owned, orders made, bills paid, and patrons who have borrowed. In this Library Management System project, you can enter the record of new books and retrieve the details of books available in the library. You can issue the books to the students and maintain their records. Late fine is charged for students who return the issued books after the due date. Only one book is issued to students. News books are not issued to students who have not returned the last book. please note that before you issue or return books which is options 1 and 2, add a book and a student to the database first (options 3 and 4). This Library Management System was written using the C++ programming language.

Output:

#include<fstream>
#include<conio.h>
#include<string.h>
#include<iomanip>
#include<iostream>

using namespace std;

class book
{
          char book_number[30];
          char book_name[50];
          char author_name[20];
  public:
          void create_book()
          {
                    cout<<"\nEnter The Book Number: ";
                    cin>>book_number;
                    cout<<"\nEnter The Name of The Book: ";
                     cin.ignore();
                    cin.getline(book_name,50);
                    cout<<"\nEnter The Author's Name: ";
                    cin.ignore();
                    cin.getline(author_name,50);
                    cout<<"\t\t\n\nBook Created Successfully...";
          }

          void show_book()
          {
                    cout<<"\nBook Number: "<<book_number;
                    cout<<"\nBook Name: "<<book_name;
                    cout<<"\nAuthor's Name: "<<author_name;
          }
          void modify_book()
          {
                    cout<<"\nBook number : "<<book_number;
                    cout<<"\nModify Book Name : ";
                    cin.ignore();
                    cin.getline(book_name,50);
                    cout<<"\nModify Author's Name: ";
                    cin.ignore();
                    cin.getline(author_name,50);
          }
          char* getbooknumber()
          {
                    return book_number;
          }
          void report()
          {cout<<book_number<<setw(30)<<book_name<<setw(30)<<author_name<<endl;}

};        

class student
{
          char ID_number[20];
          char Student_name[20];
          char stbno[6];
          int token;
public:
          void create_student()
          {
                    cout<<"\nEnter The ID Number ";
                    cin>>ID_number;
                    cout<<"\n\nEnter The Name of The Student: ";
                    cin>>Student_name;
                    token=0;
                    stbno[0]='/0';
                    cout<<"\t\t\n\nStudent Record Created Successfully...";
          }
          void show_student()
          {
                    cout<<"\nID Number: "<<ID_number;
                    cout<<"\nStudent Name: ";
                    puts(Student_name);
                    cout<<"\nNo of Book issued: "<<token;
                    if(token==1)
                               cout<<"\nBook No "<<stbno;
          }
          void modify_student()
          {
                    cout<<"\nID Number: "<<ID_number;
                    cout<<"\nModify Student Name: ";
                    cin.ignore();
                    cin.getline(Student_name,50);
          }
          char* get_ID_number()
          {
                    return ID_number;
          }
          char* retstbno()
          {
                    return stbno;
          }
          int rettoken()
          {
                    return token;
          }
          void addtoken()
          {token=1;}
          void resettoken()
          {token=0;}
          void getstbno(char t[])
          {
                    strcpy(stbno,t);
          }
          void report()
          {cout<<"\t"<<ID_number<<setw(20)<<Student_name<<setw(10)<<token<<endl;}
};        

fstream fp,fp1;
book bk;
student st;
void write_book()
{
          system("cls");
          int more_or_main;
          fp.open("book.dat",ios::out|ios::app);
          do
          {
                    bk.create_book();
                    fp.write((char*)&bk,sizeof(book));
                    cout<<"\nPress 1 to add more books.";
                    cout<<"\nPress 2 to return to main menu.\n";
                    cout<<"Enter: ";
                    cin>>more_or_main;
          }while(more_or_main == 1);
          fp.close();
}
void write_student()
{
        system("cls");
          int more_or_main;
          fp.open("student.dat",ios::out|ios::app);
          do
          {
                    st.create_student();
                    fp.write((char*)&st,sizeof(student));
                    cout<<"\nPress 1 to add more students.";
                    cout<<"\nPress 2 to return to main menu.\n";
                    cout<<"Enter: ";
                    cin>>more_or_main;
          }while(more_or_main == 1);
          fp.close();
}
void display_a_book(char n[])
{
          system("cls");
          cout<<"\nBOOK DETAILS\n";
          int check=0;
          fp.open("book.dat",ios::in);
          while(fp.read((char*)&bk,sizeof(book)))
          {
                    if(strcmpi(bk.getbooknumber(),n)==0)
                    {
                               bk.show_book();
                              check=1;
                    }
          }
          fp.close();
          if(check==0)
                    cout<<"\n\nBook does not exist";
        getch();
}
void display_a_student(char n[])
{
          system("cls");
          cout<<"\nSTUDENT DETAILS\n";
          int check=0;
          fp.open("student.dat",ios::in);
          while(fp.read((char*)&st,sizeof(student)))
          {
                    if((strcmpi(st.get_ID_number(),n)==0))
                    {
                               st.show_student();
                               check=1;
                    }
          }
          fp.close();
          if(check==0)
                    cout<<"\n\nStudent does not exist";
          getch();
}
void modify_book()
{
          system("cls");
          char n[20];
          int found=0;
          cout<<"\n\n\tMODIFY BOOK";
          cout<<"\n\n\tEnter The book number: ";
          cin>>n;
          fp.open("book.dat",ios::in|ios::out);
          while(fp.read((char*)&bk,sizeof(book)) && found==0)
          {
                    if(strcmpi(bk.getbooknumber(),n)==0)
                    {
                               bk.show_book();
                               cout<<"\nEnter The New Details of book"<<endl;
                               bk.modify_book();
                               int pos=-1*sizeof(bk);
                              fp.seekp(pos,ios::cur);
                              fp.write((char*)&bk,sizeof(book));
                              cout<<"\n\n\t Record Updated Successfully...";
                              found=1;
                    }
          }
          fp.close();
          if(found==0)
                    cout<<"\n\n Record Not Found ";
          getch();
}
void modify_student()
{
          system("cls");
          char n[20];
          int found=0;
          cout<<"\n\n\tMODIFY STUDENT RECORD... ";
          cout<<"\n\n\tEnter Student's ID number: ";
          cin>>n;
          fp.open("student.dat",ios::in|ios::out);
          while(fp.read((char*)&st,sizeof(student)) && found==0)
          {
                    if(strcmpi(st.get_ID_number(),n)==0)
                    {
                               st.show_student();
                               cout<<"\nEnter The New Details of student"<<endl;
                               st.modify_student();
                               int pos=-1*sizeof(st);
                               fp.seekp(pos,ios::cur);
                               fp.write((char*)&st,sizeof(student));
                               cout<<"\n\n\t Record Updated Successfully...";
                               found=1;
                    }
          }
          fp.close();
          if(found==0)
                    cout<<"\n\n Record Not Found ";
          getch();
}
void delete_student()
{
          system("cls");
          char n[20];
          int flag=0;
          cout<<"\n\n\n\tDELETE STUDENT";
          cout<<"\n\nEnter The ID number of the Student You Want To Delete: ";
          cin>>n;
          fp.open("student.dat",ios::in|ios::out);
          fstream fp2;
          fp2.open("Temp.dat",ios::out);
          fp.seekg(0,ios::beg);
          while(fp.read((char*)&st,sizeof(student)))
          {
                    if(strcmpi(st.get_ID_number(),n)!=0)
                              fp2.write((char*)&st,sizeof(student));
                    else
                              flag=1;
          }
          fp2.close();
          fp.close();
          remove("student.dat");
          rename("Temp.dat","student.dat");
          if(flag==1)
                    cout<<"\n\n\tRecord Deleted ..";
          else
                    cout<<"\n\nRecord not found";
        getch();
}
void delete_book()
{
          system("cls");
          char n[20];
          int flag=0;
          cout<<"\n\n\n\tDELETE BOOK";
          cout<<"\n\nEnter The Book's number You Want To Delete: ";
          cin>>n;
          fp.open("book.dat",ios::in|ios::out);
          fstream fp2;
          fp2.open("Temp.dat",ios::out);
          fp.seekg(0,ios::beg);
          while(fp.read((char*)&bk,sizeof(book)))
          {
                    if(strcmpi(bk.getbooknumber(),n)!=0)  
                    {
                               fp2.write((char*)&bk,sizeof(book));
                    }
                    else
                              flag=1;
          }
          fp2.close();
          fp.close();
          remove("book.dat");
          rename("Temp.dat","book.dat");
          if(flag==1)
                    cout<<"\n\n\tRecord Deleted ..";
          else
                    cout<<"\n\nRecord not found";
          getch();
}
void display_all_students()
{
              system("cls");
          fp.open("student.dat",ios::in);
          if(!fp)
          {
                    cout<<"ERROR!!! FILE COULD NOT BE OPEN ";
                    getch();
                    return;
          }
          cout<<"\n\n\t\tSTUDENT LIST\n\n";
          cout<<"==================================================================\n";
          cout<<"\tID Number."<<setw(10)<<"Name"<<setw(20)<<"Book Issued\n";
          cout<<"==================================================================\n";
          while(fp.read((char*)&st,sizeof(student)))
          {
                    st.report();
          }
          fp.close();
          getch();
}
void display_allb()
{
          system("cls");
          fp.open("book.dat",ios::in);
          if(!fp)
          {
                    cout<<"ERROR!!! FILE COULD NOT BE OPEN ";
                    getch();
                    return;
          }
          cout<<"\n\n\t\tBook LIST\n\n";
         cout<<"=========================================================================\n";
          cout<<"Book Number"<<setw(20)<<"Book Name"<<setw(25)<<"Author\n";
          cout<<"=========================================================================\n";
          while(fp.read((char*)&bk,sizeof(book)))
          {
                    bk.report();
          }
          fp.close();
          getch();
}
void issue_book()
{
          system("cls");
          char sn[20],bn[20];
          int found=0,flag=0;
   cout<<"\t\t\nBOOK ISSUE";
          cout<<"\n\n\tEnter student's ID number: ";
          cin>>sn;
          fp.open("student.dat",ios::in|ios::out);
          fp1.open("book.dat",ios::in|ios::out);
          while(fp.read((char*)&st,sizeof(student)) && found==0)
          {
                    if(strcmpi(st.get_ID_number(),sn)==0)
                    {
                               found=1;
                               if(st.rettoken()==0)
                               {
                                        cout<<"\n\n\tEnter book number: ";
                                         cin>>bn;
                                         while(fp1.read((char*)&bk,sizeof(book))&& flag==0)
                                         {
                                                   if(strcmpi(bk.getbooknumber(),bn)==0)
                                                 {
                                                           bk.show_book();
                                                             flag=1;
                                                             st.addtoken();
                                                             st.getstbno(bk.getbooknumber());
                                                             int pos=-1*sizeof(st);
                                                             fp.seekp(pos,ios::cur);
                                                             fp.write((char*)&st,sizeof(student));
                                                             cout<<"\n\n\t Book issued successfully...";
                                                   }
                                        }
                                        if(flag==0)
                                                   cout<<"Book number does not exist";
                               }
                              else
                                        cout<<"You have not returned the last book ";
                    }
          }
          if(found==0)
                    cout<<"Student record not exist...";
          getch();
          system("cls");
          fp.close();
          fp1.close();
}
void book_return()
{
    system("cls");
    char sn[20],bn[20];
    int found=0, flag=0, day, fine;
   cout<<"\t\tRETURN BOOKS\n";
    cout<<"\n\n\tEnter The student’s ID Number: ";
    cin>>sn;
    fp.open("student.dat",ios::in|ios::out);
    fp1.open("book.dat",ios::in|ios::out);
    while(fp.read((char*)&st,sizeof(student)) && found==0)
       {
                       if(strcmpi(st.get_ID_number(),sn)==0)
              {
                        found=1;
                        if(st.rettoken()==1)
                        {
                               while(fp1.read((char*)&bk,sizeof(book))&& flag==0)
                               {
                                         if(strcmpi(bk.getbooknumber(),st.retstbno())==0)
                               {
                                         bk.show_book();
                                         flag=1;
                                         cout<<"\n\nBook returned in no. of days";
                                         cin>>day;
                                         if(day>15)
                                         {
                                            fine=(day-15)*1;
                                            cout<<"\n\nThe Book is last. You have to pay a fine of  "<<fine;
                                         }
                                                   st.resettoken();
                                                   int pos=-1*sizeof(st);
                                                   fp.seekp(pos,ios::cur);
                                                   fp.write((char*)&st,sizeof(student));
                                                  cout<<"\n\n\t Book returned successfully...";
                               }
                        }
                      if(flag==0)
                        cout<<"Book number does not exist";
                          }
                     else
                               cout<<"No book is issued..please check!!";
                    }
             }
      if(found==0)
          cout<<"Student record not exist...";
          getch();
          system("cls");
  fp.close();
  fp1.close();
  }
void intro()
{
     system("color 05");
     system("cls");
  cout<<"\t\t\t\t*\t*";
  cout<<"\t\t\t\t**\t**";
   cout<<"\t\t\t\t***\t***";
   cout<<"\t\t\t\t****\t****";
   cout<<"\t\t\t\t*****\t*****";
    cout<<"\t\t\t\t******\t******";
   cout<<"\t\t\t\t*******\t*******";
   cout<<"\t\t\t\t*******\t*******";
   cout<<"\t\t\t\t******\t******";
   cout<<"\t\t\t\t*****\t*****";
   cout<<"\t\t\t\t****\t****";
   cout<<"\t\t\t\t***\t***";
   cout<<"\t\t\t\t**\t**";
   cout<<"\t\t\t\t*\t*";
}
void book_menu()
{
          int option;
            cout<<"\t\t@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@";
                cout<<"\n\t\tPress 1 to CREATE BOOKS";
                cout<<"\n\t\tPress 2 to DISPLAY ALL BOOKS";
                cout<<"\n\t\tPress 3 to DISPLAY SPECIFIC BOOK";
                cout<<"\n\t\tPress 4 to MODIFY BOOKS";
                cout<<"\n\t\tPress 5 to DELETE BOOKS";
                cout<<"\n\t\tPress 6 to GO BACK TO MAIN MENU";
 cout<<"\n\t\t@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n";
 cout<<"\n\t\tOption: ";
 cin>>option;
 switch(option)
          {
                    case 1:  system("cls");
                                         write_book();
                                                   break;
                               case 2: display_allb();
                                 break;
                    case 3:
                              char num[20];
                               system("cls");
                              cout<<"\n\n\tPlease Enter The book No. ";
                              cin>>num;
                              display_a_book(num);
                              break;
                    case 4: modify_book();break;
                    case 5: delete_book();break;
                    case 6: system("cls");
                               break;
                    default:cout<<"\a";
          }
}
void student_menu()
{
          int option;
           cout<<"\t\t@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@";
                cout<<"\n\t\tPress 1 to CREATE STUDENT RECORD";
                cout<<"\n\t\tPress 2 to DISPLAY ALL STUDENTS RECORD";
                cout<<"\n\t\tPress 3 to DISPLAY SPECIFIC STUDENT RECORD";
                cout<<"\n\t\tPress 4 to MODIFY STUDENT RECORD";
                cout<<"\n\t\tPress 5 to DELETE STUDENT RECORD";
                 cout<<"\n\t\tPress 6 to GO BACK TO MAIN MENU";
 cout<<"\n\t\t@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n";
 cout<<"\n\t\tOption: ";
 cin>>option;
 switch(option)
          {
                    case 1:  system("cls");
                            write_student();
                             break;
                    case 2: system("cls");

                              display_all_students();
                            break;
                    case 3:
                              char num[20];
                               system("cls");
                        cout<<"\n\n\tPlease Enter The ID Number: ";
                              cin>>num;
                         display_a_student(num);
                              break;
                    case 4:system("cls");
                           modify_student();break;
                    case 5: system("cls");
                           delete_student();break;
                    case 6: 
                               break;
                    default:cout<<"\a";
          }
}
int main()
{
          int option = 0;
          for(;;)
          {
                    intro();
           cout<<"\t\t@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@";
                cout<<"\n\t\tPress 1 to ISSUE BOOKS";
                cout<<"\n\t\tPress 2 to RETURN BOOKS";
   cout<<"\n\t\tPress 3 to UPDATE STUDENT RECORDS";
   cout<<"\n\t\tPress 4 to UPDATE BOOK RECORDS";
   cout<<"\n\t\tPress 5 to TO EXIT";
 cout<<"\n\t\t@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n";
 cout<<"\n\t\tOption: ";
 cin>>option;
 switch(option)
                    {
                               case 1:system("cls");
                                          issue_book();
                                          break;
                              case 2:system("cls");
                                         book_return(); 
                                          break;
                              case 3:system("cls");
                                         student_menu();
                                          break;
                       case 4:system("cls");
                                  book_menu();
                                  break;
                              case 5:exit(0);
                                         break;
                              default :cout<<"\a";
                                         exit(0);
                    }
          }
}