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% nacteni: /* ['2.1.2_3.pl']. */ % vymaz predchozi deklarace member :- retractall(member/2). :- dynamic member/2. member(X,[Y|_]) :- X == Y. member(X,[_|T]) :- member(X,T). % demonstracni vypis % abychom se vyhli varovanim "Redefined static procedure ..." :- dynamic write_all_X/3, start/0. write_all_X(Goal,X,Name):- call(Goal),write(' '),write(Name),write(' = '),write(X),nl,fail. write_all_X(_,_,_). start:- write('Member - 2. varianta (efektivnejsi, ne obousmerna),'), nl, nl, write('Vysledek volani "member(a,[X,b,c])" je:'),nl, write_all_X(member(a,[X,b,c]), X, 'X'), write('No'), nl, nl, write('Vysledek volani "member(a,[a,b,a]),write(ok),nl,fail" je:'),nl. ?-start. ?-member(a,[a,b,a]),write(ok),nl,fail. :- retractall(write_all_X/3). :- retractall(start/0).
true