IN C++

My project will be a library management system. It will have seven functions.

It HAS to contain: classes, structures, pointers and inheritance.

fix code according to below

1. Add a new book

• allows the user to enter in book name and book code

  • Book code has to be in #

    • Invalid book code

  • book name has been added to library

• book code will be used to borrow books

2. Add a new user

• must use first

• user must add a user ID and username

  • User ID must be in #

    • Invalid user ID

  • Welcome username

• user ID is used for borrowing books

3. Borrow a book

• uses the book code to borrow a book

  • Book code must be in #

    • Invalid book code

  • Username has borrowed book name

• Borrowing a borrowed book

  • This book is being borrowed by username

• once a book is borrowed no one else can borrow it

• changes availability to unavailable in search a book

4. Return a book

• -returns the availability of the book to available

• enter in book code to return

  • Book code must be in #

    • Invalid book code

  • Thank you for returning book name

  • Changes availability of the book to available

5. Search a book

• enter in book code

  • Invalid book code

• shows availability

• the message sorry this book is borrowed by username

  • shows who borrowed the book and book name

6. Displays users and number of books they have

• Shows all user ID, Username and number of books they have

7. Exit

• Exits the program

What i have so far (modify this code):

most of it is written just fix up the mistakes

#include

using namespace std;

//structure to store library data

struct library{

int code;

char title[20];

int status;

};

//structure to store user data

struct users{

int id;

char name[20];

int booksNumber;

};

int main()

{

int tempId,i,flag=0,j;

char tempName[20];

int tempCode;

struct users user_details[100];//variable to hold 100 userdetails

struct library book_details[100];//variable to hold 100 book details

int user_count=0,books_count=0;

int choice;

//this loop runs until 7 is entered

do{

cout <<"MENU ";

cout << "1. Add a new book ";

cout << "2. Add a new user ";

cout << "3. Borrow a book ";

cout << "4. Return a book ";

cout << "5. Search a book ";

cout << "6. Displays users and number of books they have ";

cout << "7. Exit ";

cout << "Enter your choice : ";

cin >> choice;

switch(choice){

//Adds a new book in to the database and increase book count by 1

case 1:

cout<<"Bookname : ";

cin >> book_details[books_count].title;

cout <<"Bookcode : ";

cin >> book_details[books_count].code;

book_details[books_count].status = 1;

books_count++;

break;

case 2:

//adds a new user details in to database

cout << "Enter UserId : ";

cin >> tempId;

//flag variable to check whether user exists or not

flag=1;

for(i=0;i

if(tempId==user_details[i].id){

cout << "UserId already taken";

flag=0;

break;

}

}

//if user is not taken creating user id and increase user_count by 1

if(flag){

user_details[user_count].id=tempId;

cout << "Enter Username : ";

cin >> user_details[user_count].name;

user_details[user_count].booksNumber=0;

user_count++;

}

break;

case 3:

cout << "Please enter your userId : ";

cin >> tempId;

flag = 0;

//check whether user exists or not using flag variable

for(i=0;i

if(user_details[i].id==tempId){

flag = 1;

break;

}

}

//if user exists then print his name and check fof the requested book

if(flag){

cout << "Welcome " << user_details[i].name << " ";

//if user has taken less than 5 books

if(user_details[i].booksNumber<=5){

cout << "Please enter book code you want to borrow : ";

cin >> tempCode;

for(j=0;j

if(book_details[j].code==tempCode && book_details[j].status!=0){

book_details[j].status=0;

user_details[i].booksNumber++;

flag = 0;

break;

}

}

if(flag){

cout << "Book not found or it has been currently borrowed ";

}

}

else{

cout << "The user reaches the max. allowed books to borrow ";

}

}

else{

cout << "Username incorrect ;";

}

break;

case 4:

// to return the book issued to a user

cout << "Please enter book code :";

cin >> tempCode;

flag=0;

for(i=0;i

if(book_details[i].code==tempCode){

flag = 1;

break;

}

}

//once book is found then check for user id

if(flag){

if(book_details[i].status==0){

cout << "Enter user id ";

cin >> tempId;

flag = 0;

for(j=0;j

if(user_details[j].id==tempId){

flag =1;

break;

}

}

//if user and book details are found

if(flag){

user_details[j].booksNumber--;

book_details[i].status = 1;

}

else{

cout << "User not found ";

}

}

else{

cout << "Book hasn't been borrowed ";

}

}

else{

cout << "Invalid code ";

}

break;

case 5:

//Searching a book using bookcode

cout << "Enter book code : ";

cin >> tempCode;

for(i=0;i

if(book_details[i].code==tempCode){

cout << book_details[i].code <<"\t"<< book_details[i].title <<"\t"<< book_details[i].status << " ";

break;

}

}

break;

case 6:

//printing details of user using user_details structure

cout << "UserID UserName BorrowerNo ";

for(i=0;i

cout << user_details[i].id <<"\t"<< user_details[i].name <<"\t"<< user_details[i].booksNumber<<" ";

}

cout << " ";

break;

case 7:

cout << "ThankYou";

break;

//if user input doesnot match with any of the case then ask him to enter data again

default:

cout << "Please enter valid input : ";

}

}while(choice!=7);

return 0;

}