c3e3a72583
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1164 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
23 lines
340 B
Prolog
23 lines
340 B
Prolog
|
|
my_length(List, Length) :-
|
|
integer(Length) ->
|
|
Length >= 0,
|
|
my_make_list(Length, List)
|
|
;
|
|
my_length(List, 0, Length).
|
|
|
|
|
|
my_make_list(0, []):-
|
|
!.
|
|
|
|
my_make_list(N, [_| Tail]):-
|
|
M is N-1,
|
|
my_make_list(M, Tail).
|
|
|
|
|
|
my_length([], Length, Length).
|
|
|
|
my_length([_| Tail], Acc, Length) :-
|
|
Acc2 is Acc + 1,
|
|
my_length(Tail, Acc2, Length).
|