Write a program to add digits of a number

class Add

{

          public static void main(String[] arg)

          {

                   int rem=0;

                   int num=Integer.parseInt(arg[0]);

                   for(int i=num;i>=1;i=i/10)

                   {

                             rem=rem+(num%10);

                             num=num/10;

                   }

                   System.out.println("result is"+rem);

          }

}