Write a program to input a number and check whether it is Niven Number (Harshad Number) or not? (81=8+1=9,81%9=0)

51)  Write a program to input a number and check whether it is Niven Number (Harshad Number) or not? (81=8+1=9,81%9=0)

import java.util.*;

public class Niven_number

{

    public static void main(String args[ ])

   {

          Scanner sc = new Scanner (System.in);

          System.out.println("Enter a number");

          int a = sc.nextInt();

          int s = 0;

          int p = a;

          while(p>0)

          {

          int d = p%10;

          s=s+d;

          p=p/10;

          }

          if(a%s==0)

          {

              System.out.println("Entered number is a NIVEN(HARSHAD) number ");

          }

          else

          {

              System.out.println("Entered number is not a NIVEN(HARSHAD) number ");

          }

   }

}

Output :

Niven-Number

       Write a program to input a numbers and find the frequency of any digit of this number, digit choose by the user. (124443=frequency of 4=3)