using System;

public class Program

{

    public static void Main()

    {

        int[] nums = { 7, 6, 3, 2, 1, 8, 4, 5 };

​

            while(true)

            {

​

                Console.WriteLine("Choose One:");

                Console.WriteLine("1 IN_ORDER");

                Console.WriteLine("2 REVERSE_ORDER");

                Console.WriteLine("3 SPECIFIC_POSITION");

                Console.WriteLine("4 Quit");

​

                var key = Console.ReadLine();

                int choice = Convert.ToInt32(key);

​

                switch (choice)

                {

                    case 1:

                        foreach (var item in nums)

                            Console.Write(item.ToString() + " ");

                        break;

                    case 2:

                        string output = "";

                        for (int x = nums.Length - 1; x >= 0; x--)

                        {

                            output += nums[x].ToString() + " ";

                        }

                        Console.Write(output);

                        break;

                    case 3:

                        Console.WriteLine("Enter Position (starting with 0)");

                        var position = Console.ReadLine();

                        Console.WriteLine(nums[Convert.ToInt32(position)].ToString());

                        break;

                    case 4:

                        return;

                }

                Console.WriteLine();

                Console.WriteLine("Press any key to continue");

                Console.ReadLine();

            }

    }

}