258. Add Digits

https://leetcode.com/problems/add-digits/

Python

class Solution:
    def addDigits(self, num: int) -> int:
        
        while num // 10 > 0:
            total = 0
            cur = num
            while cur // 10 > 0:
                total += cur % 10
                cur = cur // 10
            total += cur
            num = total
        return num