using System;

 struct FmRadio

{

    private enum  Channels

    {

        RadioRock,

        KissFM,

        LuxFM,

        GoodRadio,

        NasheRadio,

        HitFM,

    }

    private enum Conditions

    {

        OFF,

        ON

    }

    private  double[] frequency;

    const int MaxVolume = 20;

    const int MinVolume=0; 

    private Channels channel;       

    private bool cond;

    private int volume;

    public override string ToString()

     {

        frequency= new double[]{89.7,92.5,97.3,100.5,102.6,107.7}; 

        if (cond == false)

        {

          return string.Format("Your radio now is {0}",(Conditions) Convert.ToInt32(cond));

        }

        return string.Format("Your radio now is {0}, channel is {1},frequency is {2} volume is {3}", (Conditions) Convert.ToInt32(cond), channel,frequency[(int)channel], volume);

     }

    public void ChangeChannelUP()

     {

        channel=(Channels)(((int)channel+1)%Enum.GetValues(typeof(Channels)).Length);

     }

    public void ChangeChannelDown()

     {

        channel = (Channels)((Convert.ToInt32(!Convert.ToBoolean((int)channel)))*Enum.GetValues(typeof(Channels)).Length + ((int)channel-1));   

     } 

    public string GetChannel()

    {

        return channel.ToString();

    }

    public void pushSwitcher() 

    {

        cond=!cond;

    }   

    public bool getCond()

     {

        return cond;

     }

    public void volumeUP()

     {

      if (volume<MaxVolume)

      {

          ++volume;

      }

     }

    public void volumeDown()

    {

       if(volume>MinVolume)

        {

           --volume;

        }

     }

   public string GetFrequency()

   {

       frequency= new double[]{89.7,92.5,97.3,100.5,102.6,107.7};

       return (frequency[(int)channel].ToString());

 }

 }

​

public class Programm 

{

    public static void Main()

    {

        string userChoice;

        FmRadio myRadio= new FmRadio();

        //myRadio.pushSwitcher();

         //Console.WriteLine(myRadio.GetFrequency());

        while (true)

        {

        Console.WriteLine(myRadio);

        Console.WriteLine("push ON/OFF button - 1; channel UP - 2; channel DOWN- 3, volume UP - 4, volume DOWN -5");

        userChoice = Console.ReadLine();

        switch (userChoice)

        {

            case "1":

            {

                myRadio.pushSwitcher();

                break;

            }

            case "2":

            {

                myRadio.ChangeChannelUP();

                break;

            }

            case "3":

            {

                myRadio.ChangeChannelDown();

                break;

            }

            case "4":

            {

                myRadio.volumeUP();

                break;

            }

            case "5":

            {

                myRadio.volumeDown();

                break;

            }

            default :

            {

                break;

            }

        }

    }

 }

}