leetcode/src/258.add-digits.cpp at main · kaanoz1/leetcode · GitHub

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/*
 * @lc app=leetcode id=258 lang=cpp
 *
 * [258] Add Digits
 */

// @lc code=start
class Solution {
    public:
        int addDigits(int num) {
            int sum;

            do{
                sum = 0;
                while(num > 0){
                    int digit = num % 10;
                    sum += digit;
                    num /= 10;
                }

                num = sum;

            } while(sum > 9);

            return sum;
        }
    };
    // @lc code=end