// elementary problem 8

​

using System;

public class Program

{

    private static bool isPrime = true;

    public static void Main()

    {

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

        int num = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Displaying prime numbers from 2 to " + num + "\n");

        for(int i = 2; i <= num; i++) {

            for(int j = 2; j <= num; j++) {

                if (i != j && i % j == 0) {

                    isPrime = false;

                    break;

                }

            }

            if(isPrime) {

                 Console.Write(i + " ");

            }

            isPrime = true;

        }

    }

}