Add Digits
time limit per test: 2 secondsmemory limit per test: 100 megabytes
Given an integer num, repeatedly add all its digits until the result has only one digit, and return it.
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
Constraints:
0 <= num <= 231 - 1
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Input: 38
Expected Output: 2
Input: 0
Expected Output: 0