77 lines
1.0 KiB
Plaintext
77 lines
1.0 KiB
Plaintext
|
|
||
|
|
:- object(numberlist,
|
||
|
|
implements(numberlistp),
|
||
|
|
extends(list)).
|
||
|
|
|
||
|
|
|
||
|
|
:- info([
|
||
|
|
version is 1.0,
|
||
|
|
authors is 'Paulo Moura',
|
||
|
|
date is 2000/7/24,
|
||
|
|
comment is 'List of numbers predicates.']).
|
||
|
|
|
||
|
|
|
||
|
|
average([], 0).
|
||
|
|
|
||
|
|
average([N| Ns], Average) :-
|
||
|
|
average([N| Ns], 0, 0, Average).
|
||
|
|
|
||
|
|
|
||
|
|
average([], Length, Sum, Average) :-
|
||
|
|
Average is Sum / Length.
|
||
|
|
|
||
|
|
average([N| Ns], Lacc, Sacc, Average) :-
|
||
|
|
Lacc2 is Lacc + 1,
|
||
|
|
Sacc2 is Sacc + N,
|
||
|
|
average(Ns, Lacc2, Sacc2, Average).
|
||
|
|
|
||
|
|
|
||
|
|
min([N| Ns], Min) :-
|
||
|
|
min(Ns, N, Min).
|
||
|
|
|
||
|
|
min([], Min, Min).
|
||
|
|
|
||
|
|
min([N| Ns], Aux, Min) :-
|
||
|
|
N < Aux ->
|
||
|
|
min(Ns, N, Min)
|
||
|
|
;
|
||
|
|
min(Ns, Aux, Min).
|
||
|
|
|
||
|
|
|
||
|
|
max([N| Ns], Max) :-
|
||
|
|
max(Ns, N, Max).
|
||
|
|
|
||
|
|
max([], Max, Max).
|
||
|
|
|
||
|
|
max([N| Ns], Aux, Max) :-
|
||
|
|
N > Aux ->
|
||
|
|
max(Ns, N, Max)
|
||
|
|
;
|
||
|
|
max(Ns, Aux, Max).
|
||
|
|
|
||
|
|
|
||
|
|
sum(List, Sum) :-
|
||
|
|
sum(List, 0, Sum).
|
||
|
|
|
||
|
|
|
||
|
|
sum([], Sum, Sum).
|
||
|
|
|
||
|
|
sum([N| Ns], Acc, Sum) :-
|
||
|
|
Acc2 is Acc + N,
|
||
|
|
sum(Ns, Acc2, Sum).
|
||
|
|
|
||
|
|
|
||
|
|
valid(List) :-
|
||
|
|
nonvar(List),
|
||
|
|
\+ \+ valid2(List).
|
||
|
|
|
||
|
|
|
||
|
|
valid2([]).
|
||
|
|
|
||
|
|
valid2([Head| Tail]) :-
|
||
|
|
number(Head),
|
||
|
|
valid2(Tail).
|
||
|
|
|
||
|
|
|
||
|
|
:- end_object.
|