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B. Robinet's Programming Symposium: Proceedings, Colloque sur la PDF

By B. Robinet

ISBN-10: 3540068597

ISBN-13: 9783540068594

ISBN-10: 3540378197

ISBN-13: 9783540378198

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Extra resources for Programming Symposium: Proceedings, Colloque sur la Programmation Paris, April 9–11, 1974

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V e r i f i c a t i o n of the v a l i d i t y of a change -insuring that each o c c u r r e n c e of the o b j e c t still obeys the c o n s t r a i n t s of the a b s t r a c t concept being m o d e l l e d and that each use of the object is valid -- is thereby m u c h simplified. It is thus our contention that changes in data structures often have pervasive effects throughout the programs, contrary to one of the b a s i c tenets of structured programming. The partial mode evaluator (we h a v e b e e n a s s u m i n g t h r o u g h o u t the use of a language w i t h h a r d typing, a feature we b e l i e v e d e s i r a b l e and e s s e n t i a l to m a n y of our proposals) w h i c h we propose is used to find all o c c u r r e n c e s of a p a r t i c u l a r concept, as m o d e l l e d by objects of some mode, and thus retains the feeling of locality.

Variables indic~es Les techniques utilis~es sont assez peu efficaces. La d~monstration consiste essentiellement en une analyse par cas. Toutes les formules sur les variables indic~es sent du type : t a R t R b~ domaine o~ R e s t A (t) R A (t + k) relation < on $ . Grace aux possibilit~s de pattern matching que donne le langage Prolog [ ~ le syst~me tente par combinaison sur les hypotheses de reconstituer le domaine pour lequel la relation est v~rifi~e. 4. les p reuves de terminaison On d~montre la terminaison d'un programme en prouvant que ehacune des boucles s'ach~ve.

Ii. La m6thode des assertions ne sert ni dans PIVOT [4], ni dans le syst~me de King, ~ assurer la preuve de terminaison. Elle ne donne que des preuves partielles. Ii est souhaitable de pouvoir unifier, dans un m~me syst~me, les deux types de preuves. iii. Avant de pouvoir prouver les programmes, le programmeur doit fournir les assertions n6cessaires et il ~prouve pour cela souvent des difficult6s. En particulier, la m~thode des assertions suppose que chaque boucle du programme est "coup6e" par une assertion inductive traduisant routes les propri6t~s de cette boucle et invariante lorsqu'on la parcourt.

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Programming Symposium: Proceedings, Colloque sur la Programmation Paris, April 9–11, 1974 by B. Robinet


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