java recursion
import java.util.Scanner;
public class SumDigit {
public static void main(String[] argh){
System.out.println("Enter int");
Scanner input = new Scanner(System.in);
int n = input.nextInt();
int sum = 0 ;
int i = 0;
print( i =Sum_of_digits(sum,n));
}
public static int Sum_of_digits(int sum,int n){
if(n<=0)
return sum ;
sum += n%10;
return Sum_of_digits(sum,n/10);
}
public static void print(int n){
System.out.print(n);
}
}