diogo/yap-6.3
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fix length/2.

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This commit is contained in:
Vítor Santos Costa 2011-10-02 19:55:12 -03:00
parent 5e0c4b923d
commit c8061d46d6
1 changed files with 5 additions and 6 deletions
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11
pl/sort.yap
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@ -24,15 +24,14 @@
% length of a list.
length(L,M) :- var(M), !, '$$_length1'(L,0,M).
length(L,M) :- '$$_length2'(M,L).
length(L,M) :- ( var(M) -> '$$_length1'(L,M,0) ; '$$_length2'(L, M) ).
'$$_length1'([], M, M).
'$$_length1'([_|L], N, O) :-
'$$_length1'([_|L], O, N) :-
M is N + 1,
'$$_length1'(L, M, O).
'$$_length1'(L, O, M).
'$$_length2'(N, L) :-
'$$_length2'(L, N) :-
( N =:= 0
->
L = []
@ -40,7 +39,7 @@ length(L,M) :- '$$_length2'(M,L).
N > 0,
N1 is N - 1,
L = [_|L1],
'$$_length2'(N1, L1)
'$$_length2'(L1, N1)
).