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 2.2, Problem 15CYU

Explanation of Solution

Reason for scanner sometimes “peek” at upcoming characters:

  • The scanner must know when to start or end a token and/or checking a syntax.
  • It need to peek ahead to see if it is still part of the same token.
  • When a token can validly be extended by two or more additional characters but not by only one at that time the user need to peek ahead...

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