using System;

public class Program

{

    public static void Main()

    {

        int[] input = { 1, 2, 3, 4, 5 };

        int[] result = Reverse(input);

        foreach (int b in result)

        {

            Console.WriteLine(b);

        }

        Console.ReadLine();

    }

     public static int[] Reverse(int[] input)

     {

         int start = 0;

         int end = input.Length -1;

         for (int i = start, j = end;i < j; i++, j--)

         {

             var temporary = input[i];

             input[i] = input[j];

             input[j] = temporary;

​

         }

         return input;

     }

}