3/31/2024 0 Comments Visual prolog 5.2 tutorialUnlike is, #= is able to solve simple equations and unify in both directions: ?- 4 is 2+X.ĮRROR: is/2: Arguments are not sufficiently instantiatedĬLP(FD) provides its own generator syntax. Once it is loaded, the #= syntax can take the place of both is and =:=. CLP(FD) is based on storing the constraints that apply to an integer value and combining those together in memory.ĬLP(FD) is an extension in most Prologs that support it, so must be loaded explicitly. However, several current Prologs offer CLP(FD) (Constraint Logic Programming over Finite Domains) as a cleaner alternative for integer arithmetic. Traditionally Prolog performed arithmetic using the is and =:= operators. This topic is intended to illustrate how modern Prolog has overcome some of the problems and rather crufty syntax that appears in older Prolog and may still be being introduced. Unfortunately, many Prolog textbooks and even teaching courses still introduce only the outdated prolog. Many modern Prolog systems are in continuous development and have added new features to address classic shortcomings of the language.
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