NEON NUMBER

NEON NUMBER:

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.

There are only 3 neon numbers. they are 0,1,9


/*Program for checking given number is neon number or not*/



import java.util.*;
public class NeonNumber
{
    public static void main(String args[])
    {
        Scanner ob=new Scanner(System.in);
        System.out.println("Enter the number to check neon number or not");
        int num=ob.nextInt();
        int square=num*num;
        int sum=0;
        while(square!=0)//Loop to find the sum of digits.
        {
            int a=square%10;
            sum=sum+a;
            square=square/10;
        }
        if(sum==num)
        {
            System.out.println(num+" is a Neon Number.");
        }
        else
        {
            System.out.println(num+" is not a Neon Number.");
        }
    }

}







OUTPUT:

Enter the number to check neon number or not
9

9 is a Neon Number.

Enter the number to check neon number or not
8

8 is not a Neon Number.