6b4bde14e1
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1903 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
43 lines
715 B
Plaintext
43 lines
715 B
Plaintext
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my_length(List, Length) :-
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my_length(List, 0, Length).
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my_length([], Length, Length).
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my_length([_| Tail], Acc, Length) :-
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Acc2 is Acc + 1,
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my_length(Tail, Acc2, Length).
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:- dynamic(pred_plain/1).
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plain_dyndb(N) :-
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assertz(pred_plain(N)),
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retract(pred_plain(N)).
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my_between(Lower, _, Lower).
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my_between(Lower, Upper, Integer) :-
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Lower < Upper,
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Next is Lower + 1,
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my_between(Next, Upper, Integer).
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my_repeat(_).
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my_repeat(N) :-
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N > 1,
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N2 is N - 1,
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my_repeat(N2).
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% generate a list containing the first N non-negative integers
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generate_list(N, List) :-
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generate_list(0, N, List).
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generate_list(N, N, []) :-
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!.
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generate_list(M, N, [M| Ms]) :-
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M < N,
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M2 is M + 1,
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generate_list(M2, N, Ms).
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