Question

Print Neon number in an array.

A neon number is a number where the sum of digits of square of the number is equal to the number. For example if the input number is 9, its square is 9*9 = 81 and sum of the digits is 9. i.e. 9 is a neon number.

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Code

import java.util.Scanner;
public class NeonNumberInArray
{
    public static void main(String[] args)
    {
        /* Initialize array */
        int [] arr;

        int n=0,i=0,squaredNumber=0,a=0,sum=0;
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter  number of elements in the array");
        n = sc.nextInt();
        arr=new int[n];
        System.out.println("Enter numbers in array");

        for(i=0;i< n;i++)
        {
           arr[i]=sc.nextInt();
        }

       /* printing Neon elements in an array */
        System.out.println("Neon Elements in an array");
        for(i=0;i< n;i++)
        {
            squaredNumber=arr[i]*arr[i];
            sum=0;
            /*Loop to find the sum of digits.*/
            while(squaredNumber!=0)
            {
                a=squaredNumber%10;
                sum=sum+a;
                squaredNumber=squaredNumber/10;
            }
            if(sum==arr[i])
            {
                System.out.println(arr[i]+" ");
            }

        }

    }
}