Nondeterminism arises naturally in concurrent languages. This book compares two of them: the operational and the denotational approach. During the last three decades several different styles of semantics for program ming languages have been developed. It is also an important concept in specification languages. We focus on different degrees of nondeterminism in programming lan guages. A real time language with dense choices gives rise to the latter. In the examples discussed, the degree of non determinism ranges from a choice between two alternatives to a choice between a collection of alternatives indexed by a closed interval of the real numbers. Besides non determinism our four example languages contain some form of recursion, a key ingredient of programming languages. Furthermore, we introduce a general technique for comparing various semantic models for a given language. The former arises in a language with nondeterministic choices. We also consider the nondeterministic random assignment and parallel composition, both couched in a simple language. On the basis of several exam ples we show how to define operational and denotational semantic models for programming languages.
Books > Computer Science
Comparative Metric Semantics Of Programming Languages
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