// Zorah Fung, CSE 142
// An example of using %10 and / 10 to pull apart a number
public class DigitSum {
   public static void main(String[] args) {
      System.out.println(digitSum(12345)); // 15
      System.out.println(digitSum(273)); // 12
      System.out.println(digitSum(48175342)); //34
   }
   
   public static int digitSum(int n) {
      int sum = 0;
      while (n > 0) {
         int lastDigit = n % 10;
         sum += lastDigit;
         n = n / 10; // to chop off the last digit
      }
      return sum;
   }
}

   
/*
  An example of using 12345 as n 
      / 10  % 10
      -----------
      1234    5
      123     4
      12      3
      1       2
      0
*/