Read e-book online A Quick and Gentle Guide to Constraint Logic Programming via PDF

By Antoni Niederlinski

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Extra resources for A Quick and Gentle Guide to Constraint Logic Programming via ECLiPSe

Example text

Selecting the leftmost free decision variable from the body of the rule defining the query; 2. e. assigning to it a value from its domain. Thereby a contracted state is generated and the selected decision variable is termed ground ; 3. Spreading the value of the ground decision variable to all its appearances in the body of the rule; 4. Testing the satisfaction of all predicates in the body of the rule using unification: • if this is not possible because some predicates are not ground, steps 1, 2 and 3 are repeated for the next nearest variable or for the rule defining this predicate, until eventually all predicates are ground and satisfied; • if all predicates in the body of the query are ground and satisfied, the query is satisfied and the variable values used for grounding are displayed as the program solution; • if some predicate in the body of the query fails, the latest selected variable is degrounded, a return is performed leftwards to the nearest tested predicate with variables not yet grounded to some values from their domains, and one of the variables is regrounded.

Ecl (a CLP program). 7 How to use the book? 8: File menu 12 Introduction the universal query top. Because top is used for all programs, it is worthwhile to clean the memory before using it for another program. This can be done by activating the option Clear toplevel module. 10. Here the user may find a full list of all standard predicates or built-ins (option Alphabetical Predicate Index ), libraries (option Constraint Library Manual ), a tutorial (ECLiPSe Tutorial Introduction) and User Manual.

This invokes the definition from line 7, E is grounded to 1, and because of the other part of the definition (lines 8 and 9, a choice point is created for the predicate membership(). The predicate fail/0 is a built-in that cannot be satisfied, so a backtrack to the choice point is made generating the next element of the list and another choice point, and so on, until (thanks to removing head after head by the action of line 7, 8 and 9 predicates) the list becomes empty. The example presented is more general than it seems: Prolog recursion is always defined between a list (in the head of the recursive rule) and the tail of this list (in the body of the recursive rule).

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