Neon_Number.java

// In this section, we will discuss what is the neon numbers and also create a
// Java program to check if the given number is neon or not. Also, we will find
// all the neon numbers between a specified range.

// Neon Number
// A positive integer whose sum of digits of its square is equal to the number
// itself is called a neon number.

import java.util.*;  
 class Neon_Number  
{  
public static void main(String args[])  
{  
int sum = 0, n;      
Scanner sc = new Scanner(System.in);  
System.out.print("Enter the number to check: ");  
//raeds an integer from the user  
n = sc.nextInt();  
//calculate square of the given number  
int square = n * n;  
//loop executes until the condition becomes false  
while(square != 0)  
{  
//find the last digit of the square      
int digit = square % 10;  
//adds digits to the variable sum  
sum = sum + digit;  
//removes the last digit of the variable square  
square = square / 10;  
}  
//compares the given number (n) with sum  
if(n == sum)  
System.out.println(n + " is a Neon Number.");  
else  
System.out.println(n + " is not a Neon Number.");  
}  
}