EBK CONCEPTS OF PROGRAMMING LANGUAGES
EBK CONCEPTS OF PROGRAMMING LANGUAGES
12th Edition
ISBN: 9780135102251
Author: Sebesta
Publisher: VST
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Chapter 4, Problem 18RQ

Explanation of Solution

Definition of Left factoring:

Left factoring is used when the parser has to choose between the RHSs of a non-terminal while expanding a non-terminal, where there are multiple RHS for the same non terminal starting with the same terminal symbol.

Example:

A aB / a

This production cannot pass the pairwise disjoint test as

First(aB)=aFirst(a)=aFirst(aB)

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