using System;

public class Program

{

    public static void Main()

    {

        int[] arr= {5,6,7,8,9,1,2,3,4};

        for (int i=0; i<arr.Length;i++){

            for( int j=arr.Length-1; j>=i; j--){

                int temp= arr[j];

                arr[j]=arr[i];

                arr[i]=temp;

                }

        Console.WriteLine("the index number of "+ i + " is " +arr[i]);

        }

    }

}

​

​

​

​

​