Różnice między wybraną wersją a wersją aktualną.
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pl:prolog:pllib:flatten [2019/06/27 15:50] |
pl:prolog:pllib:flatten [2019/06/27 15:50] (aktualna) |
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| + | ====== Flatten ====== | ||
| + | {{tag>lists recursion}} | ||
| + | ===== Description ===== | ||
| + | Flattening a list with double recursion | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | ===== Download ===== | ||
| + | Program source code: {{flatten.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | /* | ||
| + | flatten(Xs,Ys) :- Ys is a list of the elements of Xs. | ||
| + | */ | ||
| + | |||
| + | flatten([X|Xs],Ys) :- | ||
| + | flatten(X,Ys1), flatten(Xs,Ys2), append(Ys1,Ys2,Ys). | ||
| + | flatten(X,[X]) :- X \== []. | ||
| + | % constant(X), X \== []. | ||
| + | flatten([],[]). | ||
| + | |||
| + | |||
| + | % Program 9.1a Flattening a list with double recursion | ||
| + | |||
| + | </code> | ||
| + | ===== Comments ===== | ||
