Sum of Digits

Problem

Return the sum of the decimal digits of a non-negative integer n.

Peel off digits with n % 10 and divide by 10 until the number becomes 0. Return 0 for n = 0.

Hint

Repeated modulo and integer division visits every digit once.

case 1

in: [0]

expected: 0

case 2

in: [123]

expected: 6

case 3

in: [9999]

expected: 36

case 4

in: [10]

expected: 1

case 5

in: [1000000]

expected: 1

Starter codePython

def sum_of_digits(n):
    # Your code here
    pass

5 test cases · run your code against them in the editor