/*----------------------------------------------------------
 *				HTBLA-Leonding / Class: <your class>
 * ---------------------------------------------------------
 * Title:			Sum of Digits
 * Author:			Marc Tismonar
 * ----------------------------------------------------------
 * Description:
 * Recursive and iterative implementation of an algorithm that calculates 
 * the sum of the digits of a given positive integer.
 * ----------------------------------------------------------
 */

#include "sum_of_digits.h"

/*
Instructions:

Define a function sum_of_digits(n) that takes a positive integer `n` as input.
The sum of digits can be calculated as n mod 10 + sum of digits of n / 10 as long as n is larger than ten.

*/

int sum_of_digits_recursive(int n) {
    if (n == 0) {
        return 0;
    }
    
    return n % 10 + sum_of_digits_recursive(n / 10);
}

int sum_of_digits_iterative(int n) {
    int sum = 0;
    
    while (n > 0) {
        sum += n % 10;
        n = n / 10;
    }
    
    return sum;
}