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.

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.

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