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3fa17815ab
Estimated hours taken: 0.2 tests/benchmarks/*.m: Move the import of print_list.m from the interface to the implementation, where it belongs, to avoid warnings.
75 lines
1.2 KiB
Mathematica
75 lines
1.2 KiB
Mathematica
:- module primes.
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:- interface.
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:- import_module list, int, io.
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:- pred main1(list(int)).
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:- mode main1(out) is det.
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:- pred main(io__state, io__state).
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:- mode main(di, uo) is det.
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:- pred main3(list(int), io__state, io__state).
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:- mode main3(out, di, uo) is det.
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:- implementation.
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:- import_module printlist.
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main --> main3(_).
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main1(Out) :-
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data(Data),
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primes(Data, Out).
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main3(Out) -->
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{ main1(Out) },
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print_list(Out).
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:- pred data(int).
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:- mode data(out) is det.
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:- pred primes(int, list(int)).
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:- mode primes(in, out) is det.
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:- pred integers(int, int, list(int)).
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:- mode integers(in, in, out) is det.
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:- pred sift(list(int), list(int)).
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:- mode sift(in, out) is det.
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:- pred remove(int, list(int), list(int)).
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:- mode remove(in, in, out) is det.
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data(98).
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primes(Limit, Ps) :-
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integers(2, Limit, Is),
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sift(Is, Ps).
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integers(Low, High, Result) :-
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( Low =< High ->
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M is Low + 1,
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Result = [Low | Rest],
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integers(M, High, Rest)
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;
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Result = []
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).
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sift([], []).
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sift([I | Is], [I | Ps]) :-
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remove(I, Is, New),
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sift(New, Ps).
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remove(_P, [], []).
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remove(P, [I | Is], Result) :-
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M is I mod P,
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( M = 0 ->
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Result = Nis,
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remove(P, Is, Nis)
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;
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Result = [I | Nis],
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remove(P, Is, Nis)
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).
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