Last updated on April 7th, 2024 at 02:34 pm

Here, We see Add Digits problem Solution. This Leetcode problem is done in many programming languages like C++, Java, JavaScript, Python, etc., with different approaches.

List of all LeetCode Solution

Add Digits LeetCode Solution

Problem Statement

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

Add Digits Leetcode Solution C++

class Solution {
public:
    int addDigits(int num) {
        while(num>9){
            int temp = num%10;
            num = num/10 + temp;
        }
        return num;
    }
};
Code language: C++ (cpp)

Add Digits Leetcode Solution Java

class Solution {
    public int addDigits(int num) {
        if(num == 0) return 0;
        else if(num % 9 == 0) return 9;
        else return num % 9;
    }
}
Code language: Java (java)

Add Digits Leetcode Solution JavaScript

var addDigits = function(num) {
    return 1 + (num - 1) % 9;
};
Code language: JavaScript (javascript)

Add Digits Leetcode Python

class Solution(object):
    def addDigits(self, num):
        return num if num == 0 else num % 9 or 9
Code language: Python (python)