Add: NeonNumber algorithm in maths

Author: AshishKumar1297

src/main/java/com/thealgorithms/maths/NeonNumber.java

@@ -0,0 +1,41 @@
+package com.thealgorithms.maths;
+
+import java.util.Scanner;
+
+public class NeonNumber {
+
+    /**
+     * Check if a number is Neon Number.
+     * A neon number is a number where a sum of digits of its square equals the number itself.
+     * Example : 9--> 9^2 = 81  --> 8+1 = 9
+     *
+     * @param number the number to check
+     * @return true if neon number, else --> false
+      */
+
+    public static boolean isNeon(int number)
+    {
+        int square = number*number;
+        int digitSum = 0;
+        while(square>0){
+            digitSum += square % 10;
+            square/= 10;
+        }
+        return digitSum == number;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("Enter a number: ");
+        int number = scanner.nextInt();
+
+        if(isNeon(number)){
+            System.out.println(number + " is a Neon Numner ");
+        } else {
+            System.out.println(number + " is not a Neon Number ");
+        }
+        scanner.close();
+    }
+}
+
+ //