using System;

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");

            // init first object of class User
            User first = new User();
            first.setData("user1", "123123");
            first.getData();
            first.age = 27;

            // init second object of class User
            User second = new User();
            second.setData("user2", "444444");
            second.getData();
            second.age = 19;
            second.compareWith(first);

            Console.ReadKey();
        }
    }

    class User
    {
        // properties
        string username;
        string password;
        string email;
        public int age;
        // constructor
        /*
        public User(string nUsername, string nPassword)
        {
            username = nUsername;
            password = nPassword;
        }
        */
        // functions
        public void setData(string nUsername, string nPassword)
        {
            username = nUsername;
            password = nPassword;
        }
        public void getData()
        {
            Console.WriteLine("User details u: " + username + " p: " + password);
        }

        public void tryLogin()
        {
            Console.WriteLine("enter username:");
            string tryUsername = Console.ReadLine();
            Console.WriteLine("enter password:");
            string tryPassword = Console.ReadLine();

            if(password == tryPassword && username == tryUsername)
            {
                Console.WriteLine("Success!");
            } else
            {
                Console.WriteLine("Error!");
            }
        }

        public void compareWith(User other)
        {
            if (this.age > other.age)
            {
                Console.WriteLine(this.username + " is older than " + other.username);
            }
            else if (this.age < other.age)
            {
                Console.WriteLine(other.username + " is older than " + this.username);
            }
            else
            {
                Console.WriteLine(this.username + " and " + other.username + " are the same age.");
            }
        }
    }

}

// https://pastebin.com/3GdLbwJj