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ecb5e4a9e6
tests/declarative_debugger/*.m:
tests/exceptions/*.m:
tests/general/*.m:
tests/grade_subdirs/*.m:
tests/purity/*.m:
tests/submodules/*.m:
tests/typeclasses/*.m:
Update programming style.
tests/declarative_debugger/*.inp:
Update line numbers in breakpoint commands.
tests/declarative_debugger/*.exp:
Update expected line numbers.
tests/exceptions/Mercury.options:
tests/general/Mercury.options:
Disable some warnings that are irrelevant to the test.
86 lines
1.6 KiB
Mathematica
86 lines
1.6 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module family.
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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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main(!IO) :-
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( if half_siblings(b, c) then
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Msg = "Ok"
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else
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Msg = "Missing answer: half_siblings(b, c)"
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),
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io.write_string(Msg, !IO),
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io.nl(!IO).
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:- type person
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---> a
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; b
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; c
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; m
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; f
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; s.
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:- pred parent(person, person).
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:- mode parent(out, out) is multi.
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:- mode parent(in, out) is nondet.
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parent(m, a).
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parent(m, b).
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parent(f, a).
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parent(f, b).
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parent(f, c).
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parent(s, c).
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:- pred male(person::in) is semidet.
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male(f).
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male(s).
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:- pred female(person::in) is semidet.
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female(X) :-
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\+ male(X).
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:- pred common_mother(person::out, person::out) is nondet.
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common_mother(A, B) :-
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parent(M, A),
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parent(M, B),
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not A = B,
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female(M).
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:- pred common_father(person::out, person::out) is nondet.
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common_father(A, B) :-
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parent(F, A),
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parent(A, B), % Oops, that's a bug.
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not A = B,
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male(F).
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:- pred siblings(person::out, person::out) is nondet.
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siblings(A, B) :-
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common_mother(A, B).
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siblings(A, B) :-
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common_father(A, B).
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:- pred full_siblings(person::out, person::out) is nondet.
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full_siblings(A, B) :-
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common_mother(A, B),
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common_father(A, B).
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:- pred half_siblings(person::out, person::out) is nondet.
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half_siblings(A, B) :-
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siblings(A, B),
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not full_siblings(A, B).
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