Property of the digital root is that the result would be n % 9 and n % 9 == 0 it will be 9.
n % 9
n % 9 == 0
int digitalRoot(int n) { if (n == 0) return 0; if (n % 9 == 0) return 9; return n % 9; }
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Property of the digital root is that the result would be
n % 9
andn % 9 == 0
it will be 9.