Różnice między wybraną wersją a wersją aktualną.
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pl:prolog:pllib:fam_grandparents [2019/06/27 15:50] |
pl:prolog:pllib:fam_grandparents [2019/06/27 15:50] (aktualna) |
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| + | ====== Fam grandparents ====== | ||
| + | {{tag>family}} | ||
| + | ===== Description ===== | ||
| + | A more efficient version of grandparent | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | ===== Download ===== | ||
| + | Program source code: {{fam_grandparents.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | /* | ||
| + | grandparent(X,Z) :- X is the grandparent of Z. | ||
| + | */ | ||
| + | grandparent(X,Z) :- nonvar(X), parent(X,Y), parent(Y,Z). | ||
| + | grandparent(X,Z) :- nonvar(Z), parent(Y,Z), parent(X,Y). | ||
| + | |||
| + | % Program 10.3 A more efficient version of grandparent | ||
| + | |||
| + | </code> | ||
| + | ===== Comments ===== | ||
