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  1. Recursive Digit Sum
  2. Discussions

Recursive Digit Sum

  • Maxxi
     + 0 comments

    php solution:

    function superDigit($n, $k) {
    // Write your code here
    if(strlen($n) == 1 && $k <= 1)
        return $n;
        
    $sum = 0;
    
    for($i = 0; $i < strlen($n); $i++)
        $sum += (int) $n[$i] * $k;
    
    return superDigit((string)$sum, 1);
}