Harshad / Niven Number

/**
* This program inputs a number and checks if it a Harshad(or Niven) number or not.
*/
import java.util.Scanner;
public class Harshad_Number
{
    static int digitSum(int num)
    {
        String a=Integer.toString(num);
        int i,x,sum=0;
        for(i=0;i<a.length();i++)
        {
            x=Character.getNumericValue(a.charAt(i));
            sum+=x;
        }
        return sum;
    }
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Please enter a number.");
        int num=sc.nextInt();
        int sum;
        sum=digitSum(num);
        if(num%sum==0) //Checks whether the number is divisible by its sum or not.
        {
            System.out.println(num+" is a Harshad Number.");
        }
        else
        {
            System.out.println(num+" is not a Harshad Number.");
        }
        sc.close();
    }
}