leetcode

0 class Solution {

1 public:

2 int addDigits(int num) {

3 while (num >= 10) {

4 int sum = 0;

5 do {

6 sum += num % 10;

7 } while ((num /= 10) > 0);

8 num = sum;

9 }

10 return num;

11 }

12 };