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Ingy döt Net 2025-08-11 18:05:26 -07:00
parent 4d5544505c
commit 4924dd0264
3073 changed files with 55820 additions and 4408 deletions
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27
Task/Damm-algorithm/Prolog/damm-algorithm.pro Normal file
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%! damm_algorithm(+Number) is semidet.
% Succeeds if the number is valid according to the Damm algorithm.
damm_algorithm(Number) :-
Matrix = [
[0, 3, 1, 7, 5, 9, 8, 6, 4, 2],
[7, 0, 9, 2, 1, 5, 4, 8, 6, 3],
[4, 2, 0, 6, 8, 7, 1, 3, 5, 9],
[1, 7, 5, 0, 9, 8, 3, 4, 2, 6],
[6, 1, 2, 3, 0, 4, 5, 9, 7, 8],
[3, 6, 7, 4, 2, 0, 9, 5, 8, 1],
[5, 8, 6, 9, 7, 2, 0, 1, 3, 4],
[8, 9, 4, 5, 3, 6, 2, 0, 1, 7],
[9, 4, 3, 8, 6, 1, 7, 2, 0, 5],
[2, 5, 8, 1, 4, 3, 6, 7, 9, 0]
],
number_codes(Number, Codes),
foldl(damm_algorithm(Matrix), Codes, 0, 0).
damm_algorithm(Matrix, Code, N0, N) :-
Digit is Code - 48,
nth0(N0, Matrix, Row),
nth0(Digit, Row, N).
:- foreach(member(Number, [5724, 5727, 112946, 112949]), (
( damm_algorithm(Number) -> write(Number is valid) ; write(Number is invalid) ),
nl
)).