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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Digital-root/Prolog/digital-root.pro Normal file
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digit_sum(N, Base, Sum):-
digit_sum(N, Base, Sum, 0).
digit_sum(N, Base, Sum, S1):-
N < Base,
!,
Sum is S1 + N.
digit_sum(N, Base, Sum, S1):-
divmod(N, Base, M, Digit),
S2 is S1 + Digit,
digit_sum(M, Base, Sum, S2).
digital_root(N, Base, AP, DR):-
digital_root(N, Base, AP, DR, 0).
digital_root(N, Base, AP, N, AP):-
N < Base,
!.
digital_root(N, Base, AP, DR, AP1):-
digit_sum(N, Base, Sum),
AP2 is AP1 + 1,
digital_root(Sum, Base, AP, DR, AP2).
test_digital_root(N, Base):-
digital_root(N, Base, AP, DR),
writef('%w has additive persistence %w and digital root %w.\n', [N, AP, DR]).
main:-
test_digital_root(627615, 10),
test_digital_root(39390, 10),
test_digital_root(588225, 10),
test_digital_root(393900588225, 10),
test_digital_root(685943443231217865409, 10).