using System;  

public class Exercise3  

{  

    public static void Main() 

{

    int[] a= new int[100];

    int i, n,r, sum=0,nsum=0,num=0,newsum=0,ro=0;

       Console.Write("\n\nFind sum of all elements of array:\n");

       Console.Write("--------------------------------------\n");   

​

       Console.Write("Input the number of elements to be stored in the array :");

       n = Convert.ToInt32(Console.ReadLine()); 

       Console.Write("Input {0} elements in the array :\n",n);

       for(i=0;i<n;i++)

        {

          Console.Write("element - {0} : ",i);

          a[i] = Convert.ToInt32(Console.ReadLine()); 

        }

​

    for(i=0; i<n; i++)

    {

        sum += a[i];

    }

​

    Console.Write("Sum of all elements stored in the array is : {0}\n\n", sum);

        while (sum  != 0)

        {

            r = sum % 10;

            sum = sum / 10;

            nsum = nsum + r;

            //For last iteration

            if (sum == 0 && nsum > 9)

                {

                    sum = nsum;

                    nsum = 0;

                }

        }

        Console.WriteLine("Sum of the Numbers order1: "+nsum);

    }

  }

​