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Estimated hours taken: 0.1 tests/benchmarks/*.m: Refer to printlist.m without an underscore. Doh.
55 lines
1011 B
Mathematica
55 lines
1011 B
Mathematica
% nreverse
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%
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% David H. D. Warren
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%
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% "naive"-reverse a list of 30 integers
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:- module nrev.
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:- interface.
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:- import_module list, int, io.
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:- pred main(io__state, io__state).
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:- mode main(di, uo) is det.
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:- pred main1(list(int)).
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:- mode main1(out) is det.
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:- pred main3(list(int), io__state, io__state).
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:- mode main3(out, di, uo) is det.
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:- implementation.
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:- import_module printlist.
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main --> main3(_).
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main1(Out) :-
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data(Data),
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nreverse(Data, Out).
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main3(Out) -->
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{ main1(Out) },
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print_list(Out).
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:- pred data(list(int)).
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:- mode data(out) is det.
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:- pred nreverse(list(int), list(int)).
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:- mode nreverse(in, out) is det.
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:- pred concatenate(list(int), list(int), list(int)).
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:- mode concatenate(in, in, out) is det.
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data([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
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16,17,18,19,20,21,22,23, 24,25,26,27,28,29,30]).
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nreverse([X|L0], L) :-
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nreverse(L0, L1), concatenate(L1, [X], L).
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nreverse([], []).
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concatenate([X|L1], L2, [X|L3]) :-
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concatenate(L1, L2, L3).
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concatenate([], L, L).
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