Prolog Online Help

Prolog is a general purpose logic programming language associated with artificial intelligence and computational linguistics. PROLOG is declarative and it is expressed in terms of relations represented as facts and rules. A computation is related by running a query over these relations. PROLOG is considered one of the first to initiate logic programming in a computer programming language and still leads the run today.

Prolog is well-suited for specific tasks that benefit from rule-based logical queries such as searching databases, voice control systems, and filling templates. As Prolog allows impure predicates, checking the truth value of certain special predicates may have some deliberate side effect, such as printing a value to the screen. Because of this, the programmer is permitted to use some amount of conventional imperative programming when the logical paradigm is inconvenient. It has a purely logical subset, called "pure Prolog", as well as a number of extralogical features.Prolog programs describe relations, defined by means of clauses. Pure Prolog is restricted to Horn clauses. There are two types of clauses: facts and rules. A rule is basically a head and body combination, which is read as "Head is true if Body is true". A rule's body consists of calls to predicates, which are called the rule's goals.

Although Prolog is widely used in research and education, Prolog and other logic programming languages have not had a significant impact on the computer industry in general.Most applications are small by industrial standards, with few exceeding 100,000 lines of code.

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