<h2 id="heading-url">URL</h2>
<p><a target="_blank" href="https://leetcode.com/problems/add-digits/description/">Add Digits - LeetCode</a></p>
<h2 id="heading-code">Code</h2>
<p><a target="_blank" href="https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202304/add_digits/main.fsx">https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202304/add_digits/main.fsx</a></p>
<pre><code class="lang-plaintext">let addDigits (num: int) : int =
    let rec digitSum n acc =
        if n = 0 then acc else digitSum (n / 10) (acc + (n % 10))

    let rec addDigits' num =
        if num &lt; 10 then num else addDigits' (digitSum num 0)

    addDigits' num
</code></pre>


## URL

[Add Digits - LeetCode](https://leetcode.com/problems/add-digits/description/)

## Code

[https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202304/add\_digits/main.fsx](https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202304/add_digits/main.fsx)

```plaintext
let addDigits (num: int) : int =
    let rec digitSum n acc =
        if n = 0 then acc else digitSum (n / 10) (acc + (n % 10))

    let rec addDigits' num =
        if num < 10 then num else addDigits' (digitSum num 0)

    addDigits' num
```

LeetCode 258. Add Digits in F#

URL

Code