using System;

using System.Collections.Generic;

​

namespace SarasaviLibrarySystem

{

    // Book Model

    class Book

    {

        public int Id { get; set; }

        public string Title { get; set; }

        public string Author { get; set; }

        public int Year { get; set; }

    }

​

    // Student Model

    class Student

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public string RegistrationNumber { get; set; }

    }

​

    // Main Program

    class Program

    {

        static List<Book> bookList = new List<Book>();

        static List<Student> studentList = new List<Student>();

        static int nextBookId = 1;

        static int nextStudentId = 1;

​

        static void Main(string[] args)

        {

            bool running = true;

            while (running)

            {

                Console.WriteLine("\n--- SARASAVI LIBRARY SYSTEM ---");

                Console.WriteLine("1. Add Book");

                Console.WriteLine("2. View All Books");

                Console.WriteLine("3. Register Student");

                Console.WriteLine("4. View All Students");

                Console.WriteLine("5. Exit");

                Console.Write("Choose an option: ");

                string choice = Console.ReadLine();

​

                switch (choice)

                {

                    case "1":

                        AddBook();

                        break;

                    case "2":

                        ViewBooks();

                        break;

                    case "3":

                        RegisterStudent();

                        break;

                    case "4":

                        ViewStudents();

                        break;

                    case "5":

                        running = false;

                        break;

                    default:

                        Console.WriteLine("Invalid option. Try again.");

                        break;

                }

            }

        }

​

        // Book Functions

        static void AddBook()

        {

            Console.Write("Enter Book Title: ");

            string title = Console.ReadLine();

​

            Console.Write("Enter Author Name: ");

            string author = Console.ReadLine();

​

            Console.Write("Enter Year Published: ");

            int year;

            while (!int.TryParse(Console.ReadLine(), out year))

            {

                Console.Write("Invalid year. Enter again: ");

            }

​

            Book newBook = new Book

            {

                Id = nextBookId++,

                Title = title,

                Author = author,

                Year = year

            };

​

            bookList.Add(newBook);

            Console.WriteLine("✅ Book added successfully!");

        }

​

        static void ViewBooks()

        {

            if (bookList.Count == 0)

            {

                Console.WriteLine("No books available.");

                return;

            }

​

            Console.WriteLine("\n--- List of Books ---");

            foreach (Book book in bookList)

            {

                Console.WriteLine($"ID: {book.Id}, Title: {book.Title}, Author: {book.Author}, Year: {book.Year}");

            }

        }

​

        // Student Functions

        static void RegisterStudent()

        {

            Console.Write("Enter Student Name: ");

            string name = Console.ReadLine();

​

            Console.Write("Enter Registration Number: ");

            string regNo = Console.ReadLine();

​

            Student newStudent = new Student

            {

                Id = nextStudentId++,

                Name = name,

                RegistrationNumber = regNo

            };

​

            studentList.Add(newStudent);

            Console.WriteLine("✅ Student registered successfully!");

        }

​

        static void ViewStudents()

        {

            if (studentList.Count == 0)

            {

                Console.WriteLine("No students registered.");

                return;

            }

​

            Console.WriteLine("\n--- List of Students ---");

            foreach (Student student in studentList)

            {

                Console.WriteLine($"ID: {student.Id}, Name: {student.Name}, Reg No: {student.RegistrationNumber}");

            }

        }

    }

}

​