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pl:prolog:pllib:list_odd-even [2019/06/27 15:50] (aktualna)
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 +====== List odd-even ======
 +{{tag>​lists}}
 +===== Description =====
 +Learning about odd-length and even-length simultaneously.
 +
 +**Source**: ​ PROLOG programming for artificial intelligence,​ 3rd Edition, Harlow, 2001, ISBN 0-201-40375-7.
 +===== Download =====
 +Program source code: {{list_odd-even.pl}}
 +===== Listing =====
 +<code prolog>
 +% Figure 19.8  Learning about odd-length and even-length simultaneously.
 +
 +% Inducing odd and even length for lists
 +
 +backliteral( even( L), [ L:list], []).
 +backliteral( odd( L), [ L:list], []).
 +
 +term( list, [X|L], [ X:item, L:list]).
 +term( list, [], []).
 +
 +prolog_predicate( fail).
 +
 +start_clause([ odd( L) ] / [ L:list]).
 +start_clause([ even( L) ] / [ L:list]).
 +
 +ex( even( [])).
 +ex( even( [a,b])).
 +ex( odd( [a])).
 +ex( odd( [b,c,d])).
 +ex( odd( [a,​b,​c,​d,​e])).
 +ex( even( [a,​b,​c,​d])).
 +
 +nex( even( [a])).
 +nex( even( [a,b,c])).
 +nex( odd( [])).
 +nex( odd( [a,b])).
 +nex( odd( [a,​b,​c,​d])).
 +</​code>​
 +===== Comments =====
  
pl/prolog/pllib/list_odd-even.txt · ostatnio zmienione: 2019/06/27 15:50 (edycja zewnętrzna)
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