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9cacd33f47
This first step deals with the consequences of such removal.
The removal itself will happen in stage 2. That step will
add "is" to the prolog module in the library.
compiler/add_pred.m:
Prepare for "is" being in the prolog module.
compiler/options.m:
Add a way to test whether the change to add_pred.m is in the
installed compiler.
tests/accumulator/base.m:
tests/accumulator/call_in_base.m:
tests/accumulator/chain.m:
tests/accumulator/commutative.m:
tests/accumulator/construct_test.m:
tests/accumulator/dcg.m:
tests/accumulator/deconstruct_test.m:
tests/accumulator/disj.m:
tests/accumulator/func.m:
tests/accumulator/heuristic.m:
tests/accumulator/highorder.m:
tests/accumulator/identity.m:
tests/accumulator/inter.m:
tests/accumulator/nonrec.m:
tests/accumulator/out_to_in.m:
tests/accumulator/qsort.m:
tests/accumulator/simple.m:
tests/accumulator/split.m:
tests/accumulator/swap.m:
tests/benchmarks/cqueens.m:
tests/benchmarks/crypt.m:
tests/benchmarks/deriv.m:
tests/benchmarks/deriv2.m:
tests/benchmarks/nrev.m:
tests/benchmarks/poly.m:
tests/benchmarks/primes.m:
tests/benchmarks/qsort.m:
tests/benchmarks/query.m:
tests/benchmarks/tak.m:
tests/debugger/interactive.m:
tests/declarative_debugger/Mercury.options:
tests/declarative_debugger/io_read_bug.m:
tests/declarative_debugger/queens.exp:
tests/declarative_debugger/queens.m:
tests/dppd/imperative_solve_impl.m:
tests/dppd/map_impl.m:
tests/dppd/max_length_impl.m:
tests/dppd/sum.m:
tests/dppd/upto_sum_impl.m:
tests/par_conj/dep_par_21.m:
tests/tabling/seq.m:
tests/term/dds3_14.m:
tests/term/mmatrix.m:
tests/term/money.m:
tests/term/occur.m:
tests/term/pl4_5_2.m:
tests/term/queens.m:
tests/typeclasses/inference_test.m:
tests/typeclasses/inference_test_2.m:
tests/valid/lazy_list.m:
tests/warnings/duplicate_const.m:
Replace calls to "is" with unifications. In many places,
bring programming style up to date.
86 lines
1.9 KiB
Mathematica
86 lines
1.9 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module primes.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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:- implementation.
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:- import_module int.
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:- import_module list.
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main(!IO) :-
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primes(limit, Out),
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print_list(Out, !IO).
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:- func limit = int.
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limit = 98.
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:- pred primes(int::in, list(int)::out) is det.
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primes(Limit, Primes) :-
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integers(2, Limit, Integers),
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sift(Integers, Primes).
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:- pred integers(int::in, int::in, list(int)::out) is det.
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integers(Low, High, Result) :-
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( if Low =< High then
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NextLow = Low + 1,
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integers(NextLow, High, Rest),
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Result = [Low | Rest]
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else
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Result = []
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).
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:- pred sift(list(int)::in, list(int)::out) is det.
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sift([], []).
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sift([Integer | Integers], [Integer | Ps]) :-
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remove_multiples(Integer, Integers, New),
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sift(New, Ps).
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:- pred remove_multiples(int::in, list(int)::in, list(int)::out) is det.
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remove_multiples(_Prime, [], []).
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remove_multiples(Prime, [I | Is], Result) :-
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( if I mod Prime = 0 then
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remove_multiples(Prime, Is, TailResult),
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Result = TailResult
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else
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remove_multiples(Prime, Is, TailResult),
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Result = [I | TailResult]
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).
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:- pred print_list(list(int)::in, io::di, io::uo) is det.
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print_list(Xs, !IO) :-
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(
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Xs = [],
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io.write_string("[]\n", !IO)
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;
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Xs = [H | T],
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io.write_string("[", !IO),
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print_list_elements(H, T, !IO),
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io.write_string("]\n", !IO)
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).
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:- pred print_list_elements(int::in, list(int)::in, io::di, io::uo) is det.
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print_list_elements(X, Xs, !IO) :-
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io.write_int(X, !IO),
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(
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Xs = []
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;
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Xs = [H | T],
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io.write_string(", ", !IO),
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print_list_elements(H, T, !IO)
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).
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