Neon Number – SchoolCodeHub

Neon Number is a number whose sum of digits of it’s square is equal to the original number.

Example 1: 9. 9² = 81. 8+1=9. We observe that the sum of digits of the square of original number is equal to the original number. Hence it is a Neon Number.

Example 2: 11. 11² = 121. 1+2+1 = 4. Here the sum of digits of the square of original number is not equal to the original number. Hence it is not a Neon Number.

Java

import java.util.*;
public class NeonNumber
{
    public static void main(String args[])
    {
        int n=0,r=0,s=0,temp=0;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter a number: ");
        n=sc.nextInt();
        temp=n*n;
        while(temp>0)
        {
            r=temp%10;
            s=s+r;
            temp=temp/10;
        }
        if(s==n)
        {
            System.out.println(n+" is a Neon Number");
        }
        else
        {
            System.out.println(n+" is not a Neon Number");
        }
    }
}

Java