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 4, Problem 11E

Explanation of Solution

Accumulating the value constant into value:

  • The val is the root attribute in this grammar.
  • At first instance the first 2 digits are passed and then computing the constant value for those elements.
  • Next adding the other digits to list to find the constant value.
  • It continues up to 9 digits.
  • The following grammar represents s-attribute grammar for the given problem.

         digits1 . digits2 C.val := digits1.val + digits2.val×10-digits2.lendigits  digit more digits digits.val := digit.val×10more_digits.len+more_digits.val digits.len := more digits.len + 1more digits  digits         more digits.val := digits.val  more digits.len := digits.lenmore digits    more digits.val := 0  more digits

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