Guarded Commands, Nondeterminacy, and Formal Derivation of Programs
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So-called “guarded commands” are introduced as a building block for alternative and repetitive constructs that allow nondeterministic program components for which at least the activity evoked, but possibly even the final state, is not necessarily uniquely determined by the initial state. For the formal derivation of programs expressed in terms of these constructs, a calculus will be shown.
KeywordsBoolean Function Variant Function Assignment Statement Statement List Formal Derivation
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