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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.
A guide to reading: The ANSWER is listed first, followed by the numbered clue.“A” is for across and “D” is for down. The day follows, to show the difficulty level. The puzzles get harder ...
Bunker: a heavily fortified, mainly underground, facility used as a defensive position; also commonly used as command centres for high-level officers. Caponier: a defensive firing position either projecting into, or traversing the ditch of a fort. Carnot wall: a wall pierced with loopholes, sited above the scarp of a ditch but below the rampart.
Taking this one stage further, the clue word can hint at the word or words to be abbreviated rather than giving the word itself. For example: "About" for C or CA (for "circa"), or RE. "Say" for EG, used to mean "for example". More obscure clue words of this variety include: "Model" for T, referring to the Model T.
Guarded Command Language, used for predicate transformer semantics; Graphical Command Language of Geomview; Honours. Grand Companion of the Order of Logohu, ...
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