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C++ 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   Follow up: Could you do it without any loop/recursion in O(1) runtime?

C++ 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   Follow up: Could you do it without any loop/recursion in O(1) runtime?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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C++

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

 

Follow up: Could you do it without any loop/recursion in O(1) runtime?

 

//code here

class Solution {
public:
    int addDigits(int num) {
        
    }
};

//

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