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pl:prolog:pllib:reverse_difference [2019/06/27 15:50] (aktualna) |
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| + | ====== Reverse difference ====== | ||
| + | {{tag>lists}} | ||
| + | ===== Description ===== | ||
| + | Reverse with difference-lists. | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | ===== Download ===== | ||
| + | Program source code: {{reverse_difference.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | /* | ||
| + | reverse(Xs,Ys) :- Ys is the reversal of the list Xs. | ||
| + | */ | ||
| + | :- op(40,xfx,\). | ||
| + | |||
| + | reverse(Xs,Ys) :- reverse_dl(Xs,Ys\[]). | ||
| + | |||
| + | reverse_dl([X|Xs],Ys\Zs) :- | ||
| + | reverse_dl(Xs,Ys\[X|Zs]). | ||
| + | reverse_dl([],Xs\Xs). | ||
| + | |||
| + | |||
| + | % Program 15.3: Reverse with difference-lists. | ||
| + | |||
| + | </code> | ||
| + | ===== Comments ===== | ||
