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32 lines
693 B
Mathematica
32 lines
693 B
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module cc_multi_bug.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is cc_multi.
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:- implementation.
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main(!IO) :-
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plus(N1, N2, s(zero)),
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print(N1, !IO), nl(!IO),
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print(N2, !IO), nl(!IO).
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:- type nat
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---> zero
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; s(nat).
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:- pred plus(nat, nat, nat).
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:- mode plus(out, out, in) is multi.
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:- mode plus(out, out, in) is cc_multi.
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plus(zero, zero, zero).
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plus(zero, s(N), s(N)).
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plus(s(N), zero, s(N)).
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plus(s(N1), s(N2), s(N3)):-
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plus(N1, s(N2), N3).
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