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95 lines
2.1 KiB
Mathematica
95 lines
2.1 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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%
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% Check that loopcheck isn't overzealous.
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:- module loopcheck_no_loop.
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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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:- pragma require_feature_set([memo]).
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:- import_module int.
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main(!IO) :-
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sum(3, Sum3),
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io.write_int(Sum3, !IO),
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io.write_string("\n", !IO),
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sum(2, Sum2),
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io.write_int(Sum2, !IO),
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io.write_string("\n", !IO),
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( if semisum(3, Semisum3) then
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io.write_int(Semisum3, !IO),
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io.write_string("\n", !IO)
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else
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io.write_string("semisum(3) failed\n", !IO)
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),
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( if semisum(2, Semisum2) then
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io.write_int(Semisum2, !IO),
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io.write_string("\n", !IO)
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else
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io.write_string("semisum(2) failed\n", !IO)
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),
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( if semisum(-2, SemisumN2) then
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io.write_int(SemisumN2, !IO),
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io.write_string("\n", !IO)
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else
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io.write_string("semisum(-2) failed\n", !IO)
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),
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( if count(3) then
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io.write_string("count(3) succeeded\n", !IO)
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else
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io.write_string("count(3) failed\n", !IO)
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),
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( if count(2) then
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io.write_string("count(2) succeeded\n", !IO)
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else
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io.write_string("count(2) failed\n", !IO)
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),
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( if count(-2) then
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io.write_string("count(-2) succeeded\n", !IO)
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else
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io.write_string("count(-2) failed\n", !IO)
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).
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:- pred sum(int::in, int::out) is det.
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:- pragma loop_check(sum/2).
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sum(N, SumN) :-
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( if N = 0 then
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SumN = 0
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else
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sum(N - 1, Sum1),
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SumN = Sum1 + N
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).
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:- pred semisum(int::in, int::out) is semidet.
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:- pragma loop_check(semisum/2).
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semisum(N, SumN) :-
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( if N < 0 then
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fail
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else if N = 0 then
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SumN = 0
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else
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semisum(N - 1, Sum1),
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SumN = Sum1 + N
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).
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:- pred count(int::in) is semidet.
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:- pragma loop_check(count/1).
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count(N) :-
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( if N < 0 then
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fail
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else if N = 0 then
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true
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else
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count(N - 1)
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).
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