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  1. Prepare
  2. Algorithms
  3. Recursion
  4. Recursive Digit Sum
  5. Discussions

Recursive Digit Sum

  • tat_lim
     + 5 comments

    Java 8 Solution (with Recursion)

    static int superDigit(String n, int k) {
    n = n.chars().mapToLong(Character::getNumericValue).sum() * k
            + "";
    return (n.length() > 1) ? superDigit(n, 1) :
                                Character.getNumericValue(n.charAt(0));
}