Package g0201_0300.s0258_add_digits

Class Solution

java.lang.Object

g0201_0300.s0258_add_digits.Solution

public class Solution
extends Object

258 - Add Digits.<p>Easy</p> <p>Given an integer <code>num</code>, repeatedly add all its digits until the result has only one digit, and return it.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> num = 38</p> <p><strong>Output:</strong> 2</p> <p><strong>Explanation:</strong></p> <pre><code> The process is 38 --> 3 + 8 --> 11 11 --> 1 + 1 --> 2 Since 2 has only one digit, return it. </code></pre> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> num = 0</p> <p><strong>Output:</strong> 0</p> <p><strong>Constraints:</strong></p> <ul> <li><code>0 <= num <= 2³¹ - 1</code></li> </ul> <p><strong>Follow up:</strong> Could you do it without any loop/recursion in <code>O(1)</code> runtime?</p>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	addDigits(int num)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

addDigits

public int addDigits(int num)