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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 ...
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.
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.
This page was last edited on 11 June 2017, at 09:18 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
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.
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 ...
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5 This repetition ends when b = 0, in which case the variables hold the solution to Bézout's identity: xa + yb = gcd(a,b).