MJP

architect • coder • strategist • musician • educator

Sum Digits

Sum Digits

Instructions

Implement a recursive function that sums the digits of a number until only one digit remains.

Example

sum_digits(11) # 2
# 1 + 1 = 2
sum_digits(99) # 9
# 9 + 9 = 18, 
# 1 + 8 = 9