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41 lines
784 B
Mathematica
41 lines
784 B
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module loopcheck_nondet.
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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 solutions.
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:- pragma require_feature_set([memo]).
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main(!IO) :-
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solutions(loop(2), Y),
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io.write(Y, !IO),
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io.write_string("\n", !IO).
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:- pragma loop_check(loop/2).
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:- pred loop(int::in, int::out) is nondet.
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loop(X, Y) :-
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( if X < 0 then
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fail
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else if X > 100 then
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fail
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else
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(
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Y = X
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;
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loop(X - 2, Y)
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;
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loop(X * 2, Y)
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)
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).
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