using System;

public class Program

{

    public static void Main()

    {

        for (int i = 0; i < 10; i++) 

        {

​

            double n;

            Console.WriteLine("Enter the value of Frequency (Hz): ");

            n = Convert.ToDouble(Console.ReadLine());

            if (n <= 3e+9)

            {

                Console.WriteLine("Radio Waves", n);

            }

            else if (n >= 3e+9 && n <= 3e+11)

            {

                Console.WriteLine("Microwaves", n);

            }

            else if (n >= 3e+11 && n <= 4e+14)

            {

                Console.WriteLine("infrared", n);

            }

            else if (n >= 4e+14 && n <= 7.5e+14)

            {

                Console.WriteLine("Visible light", n);

            }

            else if (n >= 7.5e+14 && n <= 3e+16)

            {

                Console.WriteLine("Ultraviolet", n);

            }

            else if (n >= 3e+16 && n <= 3e+19)

            {

                Console.WriteLine("X-rays", n);

            }

            else if (n > 3e+19)

            {

                Console.WriteLine("Gamma rays", n);

            }

}

    }

}

​