library M.S.

#include<bits/stdc++.h>
#include<iostream>
#include<fstream>
#include<stdlib.h>
#include<stdio.h>
#include<process.h>
#include<conio.h>
using namespace std;
#define el "\n"
#define sp " "

int res_book(int,int);    //To check whether any book a given book no. exists or not
/*Class of books*/
class book
{
 protected:
 int bno,quant;      //book no
 char bname[50];     //book name
 char aname[50];     //book author's name
 char pname[50];      //publication name
 public:
  void createb();
  void showb();
  void showlist();
  void assignbno(int x)       //bno assigned on the basis of no
  {          //no. of objects in file
   bno=10001;
   bno+=x-1;
   start1:
    bno+=1;
    if(res_book(bno,0))
    goto start1;
  }
  void set_q()
  {
   quant-=1;
  }
  int quantity()
  {
   return quant;
  }
  void reset_q()
  {
   quant+=1;
  }
  int retbno()
  {
   return bno;
  }
};
/*End of class book*/


void book::createb()       //To enter data in data members of class book
{
 int i;
 cout<<"\n\t\tEnter the details:-\n";
 cout<<"\n\t\tEnter Book's Name: ";
 char n[50];
 cin.getline(n,50);
 cin.getline(bname,50);
 for(i=0;bname[i]!='\0';i++)
 {
  if(bname[i]>='a'&&bname;[i]<='z')
  bname[i]-=32;
 }
 cout<<"\n\t\tEnter Author's Name: ";
 cin.getline(aname,50);
 cout<<"\n\t\tEnter Publication Name: ";
 cin.getline(pname,50);
 cout<<"\n\t\tEnter Book's quantity: ";
 cin>>quant;
}


void book::showb()           //To display the details of books
{
 cout<<"\n\t\tBook No.: "<<bno<<el;
 cout<<"\n\t\tBook Name: "<<bname<<el;
 cout<<"\n\t\tBook's Author Name: "<<aname<<el;
 cout<<"\n\t\tBook's Publication: "<<pname<<el;
 cout<<"\n\t\tBook's Quantity: "<<quant<<el;
}


void book::showlist()          //To display book details in list form
{
 cout<<"\n\t"<<bno<<"\t\t"<<bname<<"\t\t"<<aname<<"\t\t"<<quant;
}


/*Class of Students*/
class student
{
 protected:
  char name[25];     //Student name
  int bno;      //Book no. of book issued
  int token;      //To veirfy book issued or not
 public:
  void creates();
  void shows();
  void showlist();
  void settoken(int x)   //To set token and assign bno a book no
  {
   bno=x;
   token=1;
  }
  void resettoken()    //To reset token
  {
   bno=0;
   token=0;
  }
  int retbno()
  {
   return bno;
  }
  int admno;      //Admission No
};
/*End of class Students*/

bool res_student(int);     //To check whether the admission no. already exist or not
void student::creates()                //To enter values to all data members of class student
{
 int i;
 plane:
 system&#40;"CLS"&#41;;
 cout<<"\n\t\tEnter the details:-\n";
 cout<<"\n\t\tEnter student's Admission no: ";
 cin>>admno;
 if(res_student(admno))
 {
  cout<<"\n\t\tRecord already exist with this admission no.";
  cout<<"\n\t\tEnter a different admission no.\n";
  system&#40;"PAUSE"&#41;;
  goto plane;
 }
 cout<<"\n\t\tEnter student's Name: ";
 char n[50];
 cin.getline(n,50);
 cin.getline(name,25);
 for(i=0;name[i]!='\0';i++)
 {
  if(name[i]>='a'&&name;[i]<='z')
  name[i]-=32;
 }
 bno=0;
 token=0;
}


void student::shows()                                     //Show details of Students
{
 cout<<"\n\t\tStudent's Admission No.: "<<admno<<el;
 cout<<"\n\t\tStudent's Name: "<<name<<el;
 if(token==1)
 {
  cout<<"\n\t\tBook Issued (Book no): "<<bno;
 }
}


void student::showlist()                                  // To display Student details in list form
{
 cout<<"\n\t"<<admno<<"\t\t"<<name<<"\t\t"<<bno;
}


/*To Write object of class book in file*/
void write_book()
{
 book bk;
 ofstream outf("book1.bin",ios::app|ios::binary);
 outf.seekp(0,ios::end);
 int x=outf.tellp()/sizeof(book);
 bk.assignbno(x);
 bk.createb();
 bk.showb();
 outf.write(reinterpret_cast<char *>(&bk;),sizeof(book));
 cout<<"\n\t\tRecord added successfully";
 outf.close();
}


/*To Write object of class student in file*/
void write_student()
{
 student st;
 ofstream outf("student.bin",ios::app|ios::binary);
 outf.seekp(0,ios::end);
 st.creates();
 st.shows();
 outf.write(reinterpret_cast<char *>(&st;),sizeof(student));
 cout<<"\n\t\tRecord added successfully";
 outf.close();
}

/*To display Student records in list form*/
void list_student()
{
 system&#40;"CLS"&#41;;
 student st;
 ifstream intf("student.bin",ios::in|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 cout<<"\n\t\tFile not found";
 else
 {
  cout<<"\n\t*****Students Details*****\n\n";
  cout<<"\n\tAdmission No:\tName: \tBook Issued:";
  while(intf.read(reinterpret_cast<char *>(&st;),sizeof(student)))
  st.showlist();
 }
 intf.close();
}


/*To display book records in list form*/
void list_book()
{
 book bk;
 ifstream intf("book1.bin",ios::in|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 cout<<"\n\t\tFile not found";
 else
 {
  cout<<"\n\t*****Books Details*****\n\n";
  cout<<"\n\tBook No:\t\tName: \t\tAuthor's Name: \t\tQuantity: ";
  while(intf.read(reinterpret_cast<char *>(&bk;),sizeof(book)))
  bk.showlist();
 }
 intf.close();
}


/*To search for a specific student*/
void search_student(int x)
{
 student st;
 int cnt=0;
 ifstream intf("student.bin",ios::in|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 cout<<"\n\t\tFile not found";
 else
 {
  while(intf.read(reinterpret_cast<char *>(&st;),sizeof(student)))
  {
   if(st.admno==x)
   {
    cnt++;
    cout<<"\n\t\tFILE FOUND!!!!";
    st.shows();
    break;
   }
  }
  if(cnt==0)
  cout<<"\n\t\tNo such record exists";
 }
 intf.close();
}


/*To search for a specific book*/
void search_book(int x)
{
 book bk;
 int cnt=0;
 ifstream intf("book1.bin",ios::in|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 cout<<"\n\t\tFile not found";
 else
 {
  while(intf.read(reinterpret_cast<char *>(&bk;),sizeof(book)))
  {
   if(bk.retbno()==x)
   {
    cnt++;
    cout<<"\n\t\tFILE FOUND!!!!";
    bk.showb();
    break;
   }
  }
  if(cnt==0)
  cout<<"\n\t\tNo such record exists";
 }
 intf.close();
}


/*To modify the book records*/
void modify_book(int x)
{
 book bk;
 int cnt=0;
 fstream intf("book1.bin",ios::in|ios::out|ios::ate|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 cout<<"\n\t\tFile not found";
 else
 {
  while(intf.read(reinterpret_cast<char *>(&bk;),sizeof(book)))
  {
   if(bk.retbno()==x)
   {
    cnt++;
    bk.createb();
    bk.showb();
    intf.seekp(intf.tellp()-sizeof(book));
    intf.write(reinterpret_cast<char *>(&bk;),sizeof(book));
    cout<<"\n\t\tRecord Updated";
    break;
   }
  }
  if(cnt==0)
  cout<<"\n\t\tNo such record exists";
 }
 intf.close();
}


/*To modify the student records*/
void modify_student(int x)
{
 student st;
 int cnt=0;
 fstream intf("student.bin",ios::in|ios::out|ios::ate|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 cout<<"\n\t\tFile not found";
 else
 {
  while(intf.read(reinterpret_cast<char *>(&st;),sizeof(student)))
  {
   if(st.admno==x)
   {
    cnt++;
    st.creates();
    st.shows();
    intf.seekp(intf.tellp()-sizeof(student));
    intf.write(reinterpret_cast<char *>(&st;),sizeof(student));
    cout<<"\n\t\tRecord Updated";
    break;
   }
  }
  if(cnt==0)
  cout<<"\n\t\tNo such record exists";
 }
 intf.close();
}


/*To delete a specific student record*/
void delete_student(int x)
{
 student st;
 int cnt=0;
 ifstream intf("student.bin",ios::in|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 cout<<"\n\t\tFile not found";
 else
 {
  ofstream outf("temp.bin",ios::app|ios::binary);
  while(intf.read(reinterpret_cast<char *>(&st;),sizeof(student)))
  {
   if(st.admno==x)
   cnt++;
   else
   outf.write(reinterpret_cast<char *>(&st;),sizeof(student));
  }
  intf.close();
  outf.close();
  if(cnt==0)
  {
   remove("temp.bin");
   cout<<"\n\t\tNo such record exists";
  }
  else
  {
   remove("student.bin");
   rename("temp.bin","student.bin");
   cout<<"\n\t\tRecord deleted successfully";
  }
 }
}

/*To delete a specific book record*/
void delete_book(int x)
{
 book bk;
 int cnt=0;
 ifstream intf("book1.bin",ios::in|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 cout<<"\n\t\tFile not found";
 else
 {
  ofstream outf("temp1.bin",ios::app|ios::binary);
  while(intf.read(reinterpret_cast<char *>(&bk;),sizeof(book)))
  {
   if(bk.retbno()==x)
   cnt++;
   else
   outf.write(reinterpret_cast<char *>(&bk;),sizeof(book));
  }
  intf.close();
  outf.close();
  if(cnt==0)
  {
   remove("temp1.bin");
   cout<<"\n\t\tNo such record exists";
  }
  else
  {
   remove("book.bin");
   rename("temp1.bin","book.bin");
   cout<<"\n\t\tRecord deleted successfully";
  }
 }
}

//To search whether a specific student record exists or not
bool res_student(int x)
{
 student st;
 int cnt=0,f=0;
 ifstream intf("student.bin",ios::in|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 f=1;
 else
 {
  while(intf.read(reinterpret_cast<char *>(&st;),sizeof(student)))
  {
   if(st.admno==x)
   {
    cnt++;
    break;
   }
  }
  if(cnt==0)
  f=1;
 }
 intf.close();
 if(f)
 return 0;
 else
 return 1;
}


/*To search a specific book and return true or false*/
int res_book(int x,int z)
{
 book bk;
 int cnt=0,f=1;
 fstream intf("book1.bin",ios::in|ios::out|ios::ate|ios::binary);
 intf.seekg(0,ios::beg);
 if(!intf)
 f=0;
 else
 {
  while(intf.read(reinterpret_cast<char *>(&bk;),sizeof(book)))
  {
   if(bk.retbno()==x)
   {
    cnt++;
    if(z==1)
    {
     bk.showb();
     if(bk.quantity()>0)
     {
      bk.set_q();
      intf.seekp(intf.tellp()-sizeof(book));
      intf.write(reinterpret_cast<char *>(&bk;),sizeof(book));
     }
     else
     f=2;
    }
    else if(z==2)
    {
     bk.showb();
     bk.reset_q();
     intf.seekp(intf.tellp()-sizeof(book));
     intf.write(reinterpret_cast<char *>(&bk;),sizeof(book));
    }
    break;
   }
  }
  if(cnt==0)
  f=0;
 }
 intf.close();
 return f;
}


/*To issue books*/
void book_issue()
{
 int sn,bn;
 system&#40;"CLS"&#41;;
 cout<<"\n\n\t\t*****BOOK ISSUE******";
 cout<<"\n\n\t\tEnter the student's admission no: ";
 cin>>sn;
 int cnt=0;
 student st;
 fstream outf("student.bin",ios::in|ios::out|ios::ate|ios::binary);
 outf.seekg(0,ios::beg);
 if(!outf)
 cout<<"\n\t\tFile not found\n";
 else
 {
  while(outf.read(reinterpret_cast<char *>(&st;),sizeof(student)))
  {
   if(st.admno==sn)
   {
    cnt++;
    list_book();
    cout<<"\n\n\t\tEnter the book no.:";
    cin>>bn;
    cout<<"\n";
    int flag=res_book(bn,1);
    if(flag==1)
    {
     st.settoken(bn);
     outf.seekp(outf.tellp()-sizeof(student));
     outf.write(reinterpret_cast<char *>(&st;),sizeof(student));
     cout<<"\n\t\tBook Issued";
     cout<<"\n\t\tNote: Write the current date in backside of the book";
     cout<<"\n\t\t      Should be submitted within 15 days to avoid fine";
     cout<<"\n\t\t      The fine is Rs. 1 for each day after 15 days period\n";
     break;
    }
    else if(flag==2)
    {
     cout<<"\n\t\tTHE BOOK IS OUT OF STOCK!!!";
     break;
    }
    else
    {
     cout<<"\n\t\tNo such record exists\n";
     break;
    }
   }
  }
  if(cnt==0)
  cout<<"\n\t\tNo such record exists\n";
 }
 outf.close();
}


/*To deposit books*/
void book_deposit()
{
 int sn,bn;
 system&#40;"CLS"&#41;;
 cout<<"\n\n\t\t*****BOOK DEPOSIT******";
 cout<<"\n\n\t\tEnter the student's admission no: ";
 cin>>sn;
 int cnt=0;
 student st;
 fstream outf("student.bin",ios::in|ios::out|ios::ate|ios::binary);
 outf.seekg(0,ios::beg);
 if(!outf)
 cout<<"\n\t\tFile not found\n";
 else
 {
  while(outf.read(reinterpret_cast<char *>(&st;),sizeof(student)))
  {
   if(st.admno==sn)
   {
    cnt++;
    bn=st.retbno();
    bool flag=res_book(bn,2);
    if(flag)
    {
     st.resettoken();
     outf.seekp(outf.tellp()-sizeof(student));
     outf.write(reinterpret_cast<char *>(&st;),sizeof(student));
     int days;
     cout<<"\n\t\tBook deposited in no. of days:";
     cin>>days;
     if(days>15)
     {
      int fine=(days-15)*1;
      cout<<"\n\n\t\tFine: "<<fine<<el;
     }
     cout<<"\n\t\tBook Deposited Successfully\n";
     break;
    }
    else
    {
     cout<<"\n\t\tNo such record exists\n";
     break;
    }
   }
  }
  if(cnt==0)
  cout<<"\n\t\tNo such record exists\n";
 }
 outf.close();
}

/*Function that has features of Admin Menu*/
void admin_menu()
{
fine:
 system&#40;"PAUSE"&#41;;
 system&#40;"CLS"&#41;;
 int opt;
 cout<<"\n\n\n\t\t\t******ADMINISTRATOR MENU******";
    cout<<"\n\n\t1.\tCREATE STUDENT RECORD";
    cout<<"\n\n\t2.\tDISPLAY ALL STUDENTS RECORD";
    cout<<"\n\n\t3.\tDISPLAY SPECIFIC STUDENT RECORD ";
    cout<<"\n\n\t4.\tMODIFY STUDENT RECORD";
    cout<<"\n\n\t5.\tDELETE STUDENT RECORD";
    cout<<"\n\n\t6.\tCREATE BOOK ";
    cout<<"\n\n\t7.\tDISPLAY ALL BOOKS ";
    cout<<"\n\n\t8.\tDISPLAY SPECIFIC BOOK ";
    cout<<"\n\n\t9.\tMODIFY BOOK ";
    cout<<"\n\n\t10.\tDELETE BOOK ";
    cout<<"\n\n\t11.\tBACK TO MAIN MENU";
    cout<<"\n\n\tPlease Enter Your Choice (1-11) ";
    cin>>opt;
    if(opt==1)
    {
     system&#40;"CLS"&#41;;
     write_student();
     cout<<el;
     goto fine;
 }
 else if(opt==2)
 {
  system&#40;"CLS"&#41;;
     list_student();
     cout<<el;
     goto fine;
 }
 else if(opt==3)
 {
  system&#40;"CLS"&#41;;
  int ad;
  cout<<"\n\n\n\t\tEnter the admission no. of the student";
  cin>>ad;
  search_student(ad);
  cout<<el;
  goto fine;
 }
 else if(opt==4)
 {
  system&#40;"CLS"&#41;;
  int ad;
  cout<<"\n\n\n\t\tEnter the admission no. of the student";
  cin>>ad;
  modify_student(ad);
  cout<<el;
  goto fine;
 }
 else if(opt==5)
 {
  system&#40;"CLS"&#41;;
  int ad;
  cout<<"\n\n\n\t\tEnter the admission no. of the student";
  cin>>ad;
  delete_student(ad);
  cout<<el;
  goto fine;
 }
 else if(opt==6)
    {
     system&#40;"CLS"&#41;;
     write_book();
     cout<<el;
     goto fine;
 }
 else if(opt==7)
 {
  system&#40;"CLS"&#41;;
     list_book();
     cout<<el;
     goto fine;
 }
 else if(opt==8)
 {
  system&#40;"CLS"&#41;;
  int ad;
  cout<<"\n\n\n\t\tEnter the book no. of the book";
  cin>>ad;
  search_book(ad);
  cout<<el;
  goto fine;
 }
 else if(opt==9)
 {
  system&#40;"CLS"&#41;;
  int ad;
  cout<<"\n\n\n\t\tEnter the book no. of the book";
  cin>>ad;
  modify_book(ad);
  cout<<el;
  goto fine;
 }
 else if(opt==10)
 {
  system&#40;"CLS"&#41;;
  int ad;
  cout<<"\n\n\n\t\tEnter the book no. of the book";
  cin>>ad;
  delete_book(ad);
  cout<<el;
  goto fine;
 }
 else if(opt==11)
 return ;
 else
 {
  cout<<"\n\t\tEnter correct option";
  cout<<el;
  goto fine;
 }
}

/*Checks for correct password*/
//The password if predefined and has to be changed through the source code
//of application
//bool passwords()
//{
// int i=0;
// char ch,st[21],ch1[21]={"0000"};
// cout<<"\n\n\t\tEnter Password : ";
// while(1)
//    {
//     ch=getch();
//     if(ch==13)
//     {
//         st[i]='\0';
//         break;
//     }
//     else if(ch==8&&i>0)
//     {
//         i--;
//         cout<<"\b \b";
//     }
//     else
//     {
//      cout<<"*";
//      st[i]=ch;
//      i++;
//     }
//    }
//    for(i=0;st[i]==ch1[i]&&st;[i]!='\0'&&ch1;[i]!='\0';i++);
//    if(st[i]=='\0'&&ch1;[i]=='\0')
//    return 1;
//    else
//    return 0;
//}

void signUp(map<string, string>& users) {
    string username, password;

    cout << "Enter your desired username: ";
    cin >> username;

    // Check if the username already exists
    if (users.find(username) != users.end()) {
        cout << "Username already exists. Please choose another username.\n";
        return;
    }

    cout << "Enter your password: ";
    cin >> password;

    // Add the new user to the map
    users[username] = password;

    cout << "Sign up successful!\n";
}

// Function to log in a user
bool logIn(const map<string, string>& users) {
    string username, password;

    cout << "Enter your username: ";
    cin >> username;

    // Check if the username exists
    auto it = users.find(username);
    if (it == users.end()) {
        cout << "Username not found. Please sign up or enter a valid username.\n";
        return false;
    }

    cout << "Enter your password: ";
    cin >> password;

    // Check if the entered password matches the stored password
    if (it->second == password) {
        cout << "Login successful!\n";
        return true;
    } else {
        cout << "Incorrect password. Login failed.\n";
        return false;
    }
}

//Main function
int main()
{
 cout<<"\n\n\t\t\t*******************************************";
 cout<<"\n\t\t\t------------------------------------------";
 cout<<"\n\t\t\t\tLIBRARY MANAGEMENT SYSTEM";
 cout<<"\n\t\t\t------------------------------------------";
 cout<<"\n\t\t\t*******************************************";
// bool a=passwords();
// if(!a)
// {
//  for(int i=0;i<2;i++)
//  {
//   cout<<"\nWrong password";
//   cout<<"\nYou have "<<2-i<<"attempts left";
//   if(passwords())
//   goto last;
//   if(i==1)
//   {
//    cout<<"\n\n\n\t\t\t All attempts failed........";
//    cout<<"\n\n\t\t\t Sorry, but you can't login";
//    exit(0);
//   }
//  }
// }

 map<string, string> users;  // Map to store usernames and passwords

    char choice;

    do {
        cout << "\nMenu:\n";
        cout << "1. Sign Up\n";
        cout << "2. Log In\n";
        cout << "3. Exit\n";
        cout << "Enter your choice: ";
        cin >> choice;

        switch (choice) {
            case '1':
                signUp(users);
                break;
            case '2':
                if (logIn(users)) {
                    // Perform actions after successful login
                    // For simplicity, let's just break the loop here
                    cout << "Welcome! Exiting...\n";
                    choice = '3';  // Set choice to exit the loop
                }
                break;
            case '3':
                cout << "Exiting...\n";
                break;
            default:
                cout << "Invalid choice. Please try again.\n";
        }
    } while (choice != '3');
 last:
  cout<<"\n\n";
 start:
  system&#40;"PAUSE"&#41;;
  system&#40;"CLS"&#41;;
  int opt;
  cout<<"\n\n\t\t\t------------------------------------------";
  cout<<"\n\t\t\t\tLIBRARY MANAGEMENT SYSTEM";
  cout<<"\n\t\t\t------------------------------------------";
  cout<<"\n\n\t\t\tWhat do you want to do?";
  cout<<"\n\t\t\t1.\tBOOK ISSUE";
  cout<<"\n\t\t\t2.\tBOOK DEPOSIT";
  cout<<"\n\t\t\t3.\tADMINISTRATOR MENU";
  cout<<"\n\t\t\t4.\tExit";
  cout<<"\n\n Choose your option: ";
  cin>>opt;
  if(opt==1)
  {
   system&#40;"CLS"&#41;;
   book_issue();
   goto start;
  }
  else if(opt==2)
  {
   system&#40;"CLS"&#41;;
   book_deposit();
   goto start;
  }
  else if(opt==3)
  {
   admin_menu();
   goto start;
  }
  else if(opt==4)
  exit(0);
  else
  {
   cout<<"\n\t\tEnter correct option";
   goto start;
  }
}