Różnice między wybraną wersją a wersją aktualną.
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pl:prolog:pllib:list_member [2019/06/27 15:50] |
pl:prolog:pllib:list_member [2019/06/27 15:50] (aktualna) |
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| + | ====== List member ====== | ||
| + | {{tag>lists}} | ||
| + | ===== Description ===== | ||
| + | Checking for list membership | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | ===== Download ===== | ||
| + | Program source code: {{list_member.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | /* | ||
| + | member_check(X,Xs) :- X is a member of the list Xs. | ||
| + | */ | ||
| + | member_check(X,[X|Xs]). | ||
| + | member_check(X,[Y|Ys]) :- X \== Y, member_check(X,Ys). | ||
| + | |||
| + | % Program 7.3 Checking for list membership | ||
| + | </code> | ||
| + | ===== Comments ===== | ||
