Download e-book for iPad: Adventure in Prolog by Dennis Merritt

By Dennis Merritt

ISBN-10: 1461234263

ISBN-13: 9781461234265

ISBN-10: 1461280079

ISBN-13: 9781461280071

Not some time past" Dennis Merritt wrote the best books that i do know of approximately enforcing specialist platforms in Prolog, and that i was once very completely happy he released it in our sequence. the single challenge is there are nonetheless a few unlucky humans round who have no idea Prolog and aren't sufficiently ready both to learn Merritt's publication, or to exploit this super efficient language, be it for knowledge-based paintings or perhaps for daily programming. in all probability this final assertion may possibly shock you should you have been less than the influence that Prolog was once an "artificial intelligence language" with very restricted software power. Please think this editor's assertion that on the contrary is right: for no less than 4 years, i've been utilizing Prolog for each programming job within which i'm given the choice of selecting the language. as a result, I 'am certainly chuffed that Dennis Merritt has written one other reliable publication on my language of selection, and that it meets the excessive typical he set along with his earlier booklet, construction professional platforms in Prolog. All that continues to be for me to do is to want you good fortune and delight while starting up in your event in Prolog.

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Extra info for Adventure in Prolog

Sample text

Here are the I/O predicates that will let us control the output of our query. w r i t e /1 This predicate always succeeds when called, and has the side effect of writing its argument to the console. It always fails on backtracking. Backtracking does not undo the side effect. n I/O Succeeds, and starts a new line. Like write, it always succeeds when called, and fails on backtracking. tab/1 It expects the argument to be an integer and tabs that number of spaces. It succeeds when called and fails on backtracking.

2-1 CALL location(X,kitchen) From this point the trace proceeds exactly as it did for the compound query in the previous chapter. kitchen) 2-2 CALL edible(apple) 2-2 EXIT (1) edible(apple) Since the body has succeeded, the goal from the previous (first) level succeeds. 1-1 EXIT (1) where_food(apple,kitchen) X = apple ->; Rules 47 Backtracking goes from the first-level goal, into the second level, proC'~eding as before. 1-1 REDO where_food(X,kitchen) 2-2 REDO edible(apple) 2-2 FAIL edible(apple) 2-t REDO location(X,kitchen) 2-1 EXIT (6) location(broccoli,kitchen) 2-2 CALL edible(broccoli) 2-2 FAIL edible(broccoli) 2-1 REDO location(X,kitchen) 2-1 EXIT (7) location(crackers,kitchen) 2-2 CALL edible(crackers) 2-2 EXIT (2) edible(crackers) 1-1 EXIT where_food(crackers,kitchen) X = crackers ->; Now any attempt to backtrack into the query will result in no more an~wers, and the query will fail.

Trace of a compound query 36 Adventure in Prolog Built-in Predicates Up to this point we have been satisfied with the format Prolog uses to give us answers. We will now see how to generate output that is customized to our needs. The example win be a query tpat lists an of the items in the kitchen. This will require performing I/O and forcing the interpreter to automatically backtrack to find aU solutions. To do this, we need to understand the concept of the built-in (evaluable) predicate. A built-in predicate is predefined by Prolog.

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Adventure in Prolog by Dennis Merritt


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