Download FM’99 — Formal Methods: World Congress on Formal Methods in by C. A. R. Hoare (auth.), Jeannette M. Wing, Jim Woodcock, Jim PDF

By C. A. R. Hoare (auth.), Jeannette M. Wing, Jim Woodcock, Jim Davies (eds.)

Formal tools are coming of age. Mathematical concepts and instruments at the moment are considered as an enormous a part of the improvement method in quite a lot of business and governmental companies. A move of know-how into the mainstream of structures improvement is slowly, yet absolutely, occurring. FM’99, the 1st international Congress on Formal equipment within the improvement of Computing platforms, is a consequence, and a degree, of this new-found adulthood. It brings a powerful array of commercial and applications-oriented papers that exhibit how formal equipment were used to take on actual difficulties. those lawsuits are a list of the technical symposium ofFM’99:alo- aspect the papers describingapplicationsofformalmethods,youwill ndtechnical reports,papers,andabstracts detailing new advances in formaltechniques,from mathematical foundations to useful instruments. the realm Congress is the successor to the 4 Formal equipment Europe Symposia, which in flip succeeded the 4 VDM Europe Symposia. This s- cession re?ects an expanding openness in the foreign neighborhood of researchers and practitioners: papers have been submitted overlaying a wide selection of formal equipment and alertness components. The programmecommittee re?ects the Congress’s foreign nature, with a club of eighty four top researchersfrom 38 di erent countries.The comm- tee was once divided into 19 tracks, each one with its personal chair to supervise the reviewing method. Our collective job was once a di cult one: there have been 259 fine quality s- missions from 35 di erent countries.

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Read or Download FM’99 — Formal Methods: World Congress on Formal Methods in the Development of Computing Systems Toulouse, France, September 20–24, 1999 Proceedings, Volume I PDF

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Additional resources for FM’99 — Formal Methods: World Congress on Formal Methods in the Development of Computing Systems Toulouse, France, September 20–24, 1999 Proceedings, Volume I

Example text

For example, it can detect dead code that will never be executed, and code that will be executed at most once. Other type systems can guarantee absence of certain kinds of programming error such as deadlock. If it is known that no type can be deduced for such an erroneous program, then type consistency ensures that the error can never occur a run time. Because type systems enforce disciplined interaction, well-typed programs often obey additional laws, useful both for comprehension and for optimisation.

Jones machine addresses which an implementation might use. So far, so good. Unfortunately it was found necessary to retain the whole stack of active environments in the state. Although the VDL definitions were operational in the sense that they computed a (set of) final outcome(s) for a given pair of program and initial state, they were certainly not Structured Operational Semantic descriptions. This negative statement goes beyond the contrast with the neat inference rule style of [70]; it is more aimed at the way in which complex machinery had crept into the state.

It turns out that a great many algebraic laws are common to nearly all paradigms, but it is the laws that they do not share that are even more interesting. The fundamental property that distinguishes two paradigms is often very neatly expressed by an algebraic law, free of all the clutter of detail involved in a formal definition, and unaltered when the detail changes. For example, functional programming languages are classified as lazy or nonlazy. In a non-lazy language, each function evaluates its arguments first, so if an argument aborts, so does the function call.

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