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teaching:labs:xp:2009a:pdt_questions [2009/03/02 16:58]
127.0.0.1 external edit
teaching:labs:xp:2009a:pdt_questions [2018/05/09 01:59] (current)
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 +====== Questions about the Prologinterface and the PDT ======
  
 +  * **Q:** Why do I get arrays in the form ''','​(element1,​ element2)''?​ Can I change that? 
 +  * **A:** There are no arrays in Prolog. The only datastructure that Prolog supports are terms. A term is either a variable, an constant (called '​atom'​ in Prolog) or a compound term (one with a functor and arguments enclosed in round brackets). The copound term ''','​(element1,​ element2)''​ is the Prolog representation of a list. Its first argument is the first list element and the second argument is the entire rest of the list. So a list with three elements will have the structure ''','​(element1,​ ','​(element2,​ element3))''​. The syntax [element1, element2, element3] is just syntactic suggar for the same thing.\\ You can change that if you retrieve the PrologSession yourself. See the JavaDoc of org.cs3.pl.prolog.PrologInterface for details. ​
 +
 +  * **Q:** Where is the structure of a result of a ''​queryOnce(String)''​ and ''​queryAll(String)''​ documented?
 +  * **A:** (dsp, 2009-02-25) Best guess till now: Nowhere. ​
teaching/labs/xp/2009a/pdt_questions.txt · Last modified: 2018/05/09 01:59 (external edit)

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