Write a Java program to check that a given number is Neon number or not.
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Neon number
A number is said to be a Neon Number if the sum of digits of the square of the number is equal to the number itself.
PROGRAM :
import java.util.*;
public class neon
{
public static void main(String args[])
{
Scanner ob=new Scanner(System.in);
System.out.print("\nEnter the number to be checked : ");
int num=ob.nextInt();
int square=num*num;
int sum=0;
while(square!=0)//Loop to find the sum of digits.
{
int a=square%10;
sum=sum+a;
square=square/10;
}
if(sum==num)
{
System.out.println(num+" is a Neon Number.");
}
else
{
System.out.println(num+" is not a Neon Number.");
}
}
}
/*
Output :
Enter the number to be checked : 9
9 is a Neon Number.
(Workings 9*9=81 sum of digits of square = 8 + 1 = 9.)
*/