replace each production of form Ai ⟹Aj? with Ai ⟹ X1? | X2? | X3? |…| ?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Consider the following
START
Arrange non-terminals in some order like A1, A2, A3,…,An
for each i from 1 to n
{
for each j from 1 to i-1
{
replace each production of form
with Ai ⟹ X1? | X2? | X3? |…| ?
where Aj ⟹ X1 | X2|…| Xn are current Aj productions
}
}
eliminate immediate left-recursion
END
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