using System;

public class Program

{

    public static void Main()

    {

        int guesses, guess, RandomNumber;

        Console.WriteLine("hello, this program is a number guessing game \n guess a number between 0 and 20");

        guesses=1;

        Random rnd = new Random();

        RandomNumber = rnd.Next(0,20)+1;

        Console.WriteLine(RandomNumber);

        guess = Convert.ToInt32(Console.ReadLine());

        while (RandomNumber != guess)

        {

            while (guess >= 0 && guess <= 20)

            {

                Console.WriteLine("wrong answer");

                if (guess > RandomNumber)

                {

                    Console.WriteLine("too large");

                    guess = Convert.ToInt32(Console.ReadLine());

                    guesses++;

                }

                else if (guess < RandomNumber)

                {

                    Console.WriteLine("too small");

                    guess = Convert.ToInt32(Console.ReadLine());

                    guess++;

                }

            }

        Console.WriteLine("invalid, not within range");

        guess = Convert.ToInt32(Console.ReadLine());

        guesses++;

        }

        Console.WriteLine("well done you got it correct within {0} guesses" , guesses);

        Console.ReadLine();

    }

}