Library Management using c

#include <stdio.h>
#include <string.h>

#define MAX_BOOKS 100
#define MAX_USERS 50

// Structure to represent a book
struct Book {
    int bookId;
    char title[100];
    char author[50];
    int availableCopies;
};

// Structure to represent a user
struct User {
    int userId;
    char name[50];
    int booksBorrowed;
    int borrowedBookIds[5]; // Assuming a user can borrow up to 5 books
};

// Function to display book details
void displayBook(struct Book book) {
    printf("Book ID: %d\nTitle: %s\nAuthor: %s\nAvailable Copies: %d\n\n",
           book.bookId, book.title, book.author, book.availableCopies);
}

// Function to display user details
void displayUser(struct User user) {
    printf("User ID: %d\nName: %s\nBooks Borrowed: %d\n",
           user.userId, user.name, user.booksBorrowed);

    printf("Borrowed Book IDs: ");
    for (int i = 0; i < user.booksBorrowed; ++i) {
        printf("%d ", user.borrowedBookIds[i]);
    }
    printf("\n\n");
}

// Function to search for a book by title
int searchBookByTitle(struct Book books[], int numBooks, char searchTitle[]) {
    for (int i = 0; i < numBooks; ++i) {
        if (strcmp(books[i].title, searchTitle) == 0) {
            return i; // Book found, return its index
        }
    }
    return -1; // Book not found
}

// Function to borrow a book
void borrowBook(struct Book books[], int numBooks, struct User *user, int bookId) {
    int index = bookId - 1; // Assuming book IDs start from 1

    if (index >= 0 && index < numBooks && books[index].availableCopies > 0) {
        // Book is available, borrow it
        user->borrowedBookIds[user->booksBorrowed] = bookId;
        user->booksBorrowed++;
        books[index].availableCopies--;

        printf("Book borrowed successfully.\n");
    } else {
        printf("Book not available for borrowing.\n");
    }
}

// Function to return a book
void returnBook(struct Book books[], int numBooks, struct User *user, int bookId) {
    int index = bookId - 1;

    if (index >= 0 && index < numBooks && user->booksBorrowed > 0) {
        // User has borrowed this book, return it
        for (int i = 0; i < user->booksBorrowed; ++i) {
            if (user->borrowedBookIds[i] == bookId) {
                user->booksBorrowed--;

                // Increase available copies of the book
                books[index].availableCopies++;

                // Remove the book ID from the user's borrowed list
                for (int j = i; j < user->booksBorrowed; ++j) {
                    user->borrowedBookIds[j] = user->borrowedBookIds[j + 1];
                }

                printf("Book returned successfully.\n");
                return;
            }
        }
    }

    printf("Book not found in user's borrowed list.\n");
}

int main() {
    struct Book library[MAX_BOOKS] = {
        {1, "The Catcher in the Rye", "J.D. Salinger", 5},
        {2, "To Kill a Mockingbird", "Harper Lee", 3},
        // Add more books...
    };

    struct User users[MAX_USERS] = {
        {1, "John Doe", 0, {}},
        {2, "Jane Smith", 0, {}},
        // Add more users...
    };

    // Example usage
    int userIndex = 0; // Index of the user borrowing/returning books

    // Borrow a book
    borrowBook(library, MAX_BOOKS, &users[userIndex], 1);

    // Display user details
    displayUser(users[userIndex]);

    // Return a book
    returnBook(library, MAX_BOOKS, &users[userIndex], 1);

    // Display book details
    displayBook(library[0]);

    return 0;
}
Library management using c