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Discussion on: Daily Challenge #264 - Digital Root

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Ayan Banerjee • • Edited

Property of the digital root is that the result would be n % 9 and n % 9 == 0 it will be 9.

int digitalRoot(int n) {
    if (n == 0) return 0;
    if (n % 9 == 0) return 9;
    return n % 9;
}