Java happy Number

 

import java.util.*;

public class Main

{public static int isHappyNumber(int num){ 

        int rem = 0, sum = 0; 

         

        while(num > 0){ 

            rem = num%10; 

            sum = sum + (rem*rem); 

            num = num/10; 

        } 

        return sum; 

    } 

                public static void main(String[] args) {

                    Scanner sc = new Scanner(System.in); 

                                 System.out.println( " enter a value");

                                 int num = sc.nextInt();   

        int result = num; 

         

        while(result != 1 && result != 4){ 

            result = isHappyNumber(result); 

        } 

         

      

        if(result == 1) 

            System.out.println(num + " is a happy number"); 

        else if(result == 4) 

            System.out.println(num + " is not a happy number");    

    } 

}