Concepts Of Programming Languages
Concepts Of Programming Languages
12th Edition
ISBN: 9780134997186
Author: Sebesta, Robert W.
Publisher: Pearson,
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Chapter 4, Problem 2PS
Program Plan Intro

Pairwise Disjointness Test:

Perform the pairwise disjointness test on the following grammar rules, for each pair of rules find the disjoint such as Aai and Aaj.

If the intersection of First(ai) and First(aj) is equivalent to the , it means pair pass the disjointness test.

Explanation of Solution

b) AB{aB}|a

Consider the above grammar to perform pairwise disjointness.

Find the First set for Right Hand Side of non-terminal symbol A.

FIRST (b{aB}) = {b}

FIRST (a) = {a}

Now, perform the intersection of FIRST (b{aB})FIRST&#

Explanation of Solution

c) BaB|a

Find the First set for Right Hand Side of non-terminal symbol B.

FIRST (aB) = {a}

FIRST (a) = {a}

Now, perform the intersection of FIRST (aB)FIRST </

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