Programming Language Pragmatics, Fourth Edition
Programming Language Pragmatics, Fourth Edition
4th Edition
ISBN: 9780124104099
Author: Michael L. Scott
Publisher: Elsevier Science
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Chapter 2.1, Problem 6CYU

Explanation of Solution

Derivation of the context-free languages:

  • The context-free grammars (CFGs) generates the context-free language (CFL).
  • A set of all CFLs is identical to the set of languages accepted by pushdown automata, and a set of regular languages is a subset of CFLs.
  • A derivation is a sequence of steps.
  • It starts with the start symbol, use some rules to do replacements, and ends with a terminal string.
  • A string “α A ω” yields string “α γ ω” if and only if “Aγ” is a production.
  • If “α” yields “β”, the user can write αβ

Explanation of Solution

Sentential form:

  • Sentential form is defined as each string of symbols in a derivation.
  • A sentence is a sentential form which has only terminal symbols...

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