recursiveDigitSum() -- Given a non-negative integer n, write a recursive function that returns the sum of the digits of n. NOTE: You may not use any loops (for or while), nor may you convert n to a String. You'll probably want to use the % and / operators.
recursiveDigitSum(111) → 3
recursiveDigitSum(123) → 6
recursiveDigitSum(908841) → 30
...Save, Compile, Run (ctrl-enter)