# Java program to check neon number

Let’s learn java program to check neon number.

## Java program to check neon number

Neon number program in java is one of the frequently asked interview question.

A neon number is a number whose sum of digits of square of the number is equal to number itself.

Also read – armstrong number in java

For example: number 9 is a neon number.

Square of number 9 : 9 * 9 = 81

Sum of square : 8 + 1 = 9

Now let’s see example on how to check if given number is neon number or not.

```import java.util.Scanner;
public class NeonNumberInJava
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.println("Please enter number to check neon number or not: ");
int number = sc.nextInt();
int square = number * number;
int sum = 0;
while(square != 0)
{
int n = square % 10;
sum = sum + n;
square = square / 10;
}
if(sum == number)
{
System.out.println(number + " is a neon number.");
}
else
{
System.out.println(number + " is not a neon number.");
}
sc.close();
}
}

```

Output:

Please enter number to check neon number or not:
1
1 is a neon number.

Please enter number to check neon number or not:
9
9 is a neon number.

Please enter number to check neon number or not:
5
5 is not a neon number.