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Operationally, Prolog's execution strategy can be thought of as a generalization of function calls in other languages, one difference being that multiple clause heads can match a given call. In that case, the system creates a choice-point, unifies the goal with the clause head of the first alternative, and continues with the goals of that first ...
The following Comparison of Prolog implementations provides a reference for the relative feature sets and performance of different implementations of the Prolog computer programming language. A comprehensive discussion of the most significant Prolog systems is presented in an article published in the 50-years of Prolog anniversary issue of the ...
Prolog is a logic programming language that has its origins in artificial intelligence, automated theorem proving and computational linguistics. [1] [2] [3]Prolog has its roots in first-order logic, a formal logic, and unlike many other programming languages, Prolog is intended primarily as a declarative programming language: the program is a set of facts and rules, which define relations.
Statement separator – demarcates the boundary between two statements; need needed for the last statement; Line continuation – escapes a newline to continue a statement on the next line; Some languages define a special character as a terminator while some, called line-oriented, rely on the newline.
The first Prolog program, also written in 1972 and implemented in Marseille, was a French question-answering system. The use of Prolog as a practical programming language was given great momentum by the development of a compiler by David H. D. Warren in Edinburgh in 1977.
Using Prolog's notation for lists, a singleton list prefix P = [H] can be seen as the difference between [H|X] and X, and thus represented with the pair ([H|X],X), for instance. Saying that P is the difference between A and B is the same as saying that append(P,B,A) holds. Or in the case of the previous example, append([H],X,[H|X]).
Visual Prolog: Application Yes Yes Yes No No No Declarative, logic No Wolfram Language: Symbolic language Yes No Yes Yes Yes Yes Logic, distributed No XL: Yes Yes No No No No concept programming: No Xojo: Application, RAD, general, web Yes Yes No Yes No Yes No XPath/XQuery: Databases, data processing, scripting No No Yes No No No Tree-oriented: Yes
Prolog (1972) stands for "PROgramming in LOGic." It was developed for natural language question answering, [12] using SL resolution [13] both to deduce answers to queries and to parse and generate natural language sentences. The building blocks of a Prolog program are facts and rules. Here is a simple example: