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The Guarded Command Language (GCL) is a programming language defined by Edsger Dijkstra for predicate transformer semantics in EWD472. [1] It combines programming concepts in a compact way. It makes it easier to develop a program and its proof hand-in-hand, with the proof ideas leading the way; moreover, parts of a program can actually be ...
Predicate transformer semantics were introduced by Edsger Dijkstra in his seminal paper "Guarded commands, nondeterminacy and formal derivation of programs".They define the semantics of an imperative programming paradigm by assigning to each statement in this language a corresponding predicate transformer: a total function between two predicates on the state space of the statement.
Guards are the fundamental concept in Guarded Command Language, a language in formal methods. Guards can be used to augment pattern matching with the possibility to skip a pattern even if the structure matches. Boolean expressions in conditional statements usually also fit this definition of a guard although they are called conditions.
The Guarded Command Language (GCL) of Edsger Dijkstra supports conditional execution as a list of commands consisting of a Boolean-valued guard (corresponding to a condition) and its corresponding statement. In GCL, exactly one of the statements whose guards is true is evaluated, but which one is arbitrary.
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List of initialisms, acronyms ("words made from parts of other words, pronounceable"), and other abbreviations used by the government and the military of the United States. Note that this list is intended to be specific to the United States government and military—other nations will have their own acronyms.
A Dictionary of Military Architecture: Fortification and Fieldworks from the Iron Age to the Eighteenth Century by Stephen Francis Wyley, drawings by Steven Lowe; Victorian Forts glossary Archived 2016-03-04 at the Wayback Machine. A more comprehensive version has been published as A Handbook of Military Terms by David Moore at the same site
D DAA DAC DACAPO DACNOS D/A converter DACTL DADS daemon DAG Daisy DAISY 201 daisy chain DONE daisywheel printer dangling pointer DANTE DAP Fortran DAPLEX DARE dark-side hacker Darms DARPA Dartmouth BASIC Darwin kernel DAS DASD DASE DASL DAT data data abstraction Data Address Generator database database administrator database machine DONE database management system database manager database ...