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Guarded Commands, Nondeterminacy and Formal Derivation of Programs-英文文献
Programming T.A. Standish
Languages Editor
Guarded Commands, 1. Introduction
Nondeterminacy and In Section 2, two statements, an alternative con-
struct and a repetitive construct, are introduced, to-
Formal Derivation gether with an intuitive (mechanistic) definition of their
semantics. The basic building block for both of them
of Programs is the so-called guarded command, a statement list
prefixed by a boolean expression: only when this
boolean expression is initially true, is the statement list
Edsger W. Dijkstra eligible for execution. The potential nondeterminacy
Burroughs Corporation allows us to map otherwise (trivially) different programs
on the same program text, a circumstance that seems
largely responsible for the fact that programs can now
be derived in a manner more systematic than before.
In Section 3, after
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