Programação em logica, prolog e restriçõs : poder de expressão v.s. eficiencia

AUTOR(ES)
DATA DE PUBLICAÇÃO

1991

RESUMO

An introduction to logic programming is initially presented by means of an evolutionary approach. Starting with a fairly complex first order formal system, the concepts of theorem proving and its automatization are described. From there the idea of proof efficiency is presented. The most significant advances obtained during the 20th century in this area are pointed out emphasizing Robinson s resolution principle. Restraining the formal system s language to Horn sentences, a major improvement of the proof mechanism is obtained, preserving reasonable expressive power. Some problems related to language expressiveness and the ways in which they have been recently approached are shown. One of these approaches is constraint programming. In the second part of the work, the implementation of an interpreter/runtime system for the Prolog language is shown. From a brief, high-level specification, lower-level implementation details (data structures, execution control) are introduced until a purely procedural program written in a conventional language (C) is obtained. Finally, the contraint programming concepts mentioned in the first part are presented in a more detailed form in order to allow for a clearer vision of how it works in practice. Thus, by means of an approach similar to that used to describe the Prolog compiler, a high-level interpreter for constraint programs is presented and, after some refinements, an instruction set that may be implemented in a conventional programming language is obtained

ASSUNTO(S)

programação logica programação orientada a objetos (computação)

ACESSO AO ARTIGO

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