E -Library Management System

import java.util.Scanner;

// Create a class for the Library
class Library {
    String bookName;
    String author;
    int pages;
    float price;
}

// Main class for the driver code
public class ELibrary {

    public static void main(String[] args) {
        // Create an array of Library objects
        Library[] library = new Library[100];

        String arNm;

        // Keep track of the number of books available in the library
        int i, input, count;

        i = input = count = 0;

        // Initialize the array with Library objects
        for (int j = 0; j < library.length; j++) {
            library[j] = new Library();
        }

        // Scanner to take input from the user
        Scanner scanner = new Scanner(System.in);

        // Iterate the loop
        while (input != 5) {
            System.out.println("\n\n********###### WELCOME TO E-LIBRARY #####********");
            System.out.println("1. Add book information\n2. Display book information");
            System.out.println("3. List all books of given author\n4. List the count of books in the library");
            System.out.println("5. Exit");

            // Enter the book details
            System.out.print("\n\nEnter one of the above: ");
            input = scanner.nextInt();

            // Process the input
            switch (input) {

                // Add book
                case 1:
                    System.out.print("Enter book name = ");
                    library[i].bookName = scanner.next();

                    System.out.print("Enter author name = ");
                    library[i].author = scanner.next();

                    System.out.print("Enter pages = ");
                    library[i].pages = scanner.nextInt();

                    System.out.print("Enter price = ");
                    library[i].price = scanner.nextFloat();
                    count++;
                    i++;
                    break;

                // Print book information
                case 2:
                    System.out.println("You have entered the following information");
                    for (int j = 0; j < count; j++) {
                        System.out.println("Book name = " + library[j].bookName +
                                "\t Author name = " + library[j].author +
                                "\t Pages = " + library[j].pages +
                                "\t Price = " + library[j].price);
                    }
                    break;

                // Take the author name as input
                case 3:
                    System.out.print("Enter author name: ");
                    arNm = scanner.next();
                    for (int j = 0; j < count; j++) {
                        if (arNm.equals(library[j].author)) {
                            System.out.println(library[j].bookName + " " +
                                    library[j].author + " " +
                                    library[j].pages + " " +
                                    library[j].price);
                        }
                    }
                    break;

                // Print total count
                case 4:
                    System.out.println("\nNo of books in library: " + count);
                    break;
                case 5:
                    System.exit(0);
            }
        }
    }
}