#258
Add Digits
pupil · 330 · lc easy +22 · verified · 68.7% accepted · 5,469 likes · top 76%
Description
Given a non-negative integer num, keep replacing it with the sum of its digits until only a single digit remains. Return that single digit.
Example 1:
Input: num = 38
Output: 2
Explanation: The process is
38 --> 3 + 8 --> 11
11 --> 1 + 1 --> 2
Since 2 has only one digit, return it.
Example 2:
Input: num = 0
Output: 0
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