using System;

​

public class Program

{

    public static void Main()

    {

        int sum = 0;

        int count = 0;

        int input;

​

        Console.WriteLine("Enter positive integers between 1 and 100. Enter 0 to find out your average.");

​

        while (true)

        {

            Console.Write("Enter a positive number: ");

            input = int.Parse(Console.ReadLine());

​

            if (input == 0)

            {

                break;

            }

​

            if (input >= 1 && input <= 100)

            {

                sum += input;

                count++;

            }

            else

            {

                Console.WriteLine("Invalid input. Please enter a number between 1 and 100.");

            }

        }

​

        if (count == 0)

        {

            Console.WriteLine("No valid numbers were entered.");

        }

        else

        {

            double average = (double)sum / count;

            Console.WriteLine("The average of the entered numbers is: " + average);

        }

    }

}

​