term factor Y power atom X NUM $
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
Related questions
Question
fill out those two table?

Transcribed Image Text:Rules
term = factor Y $
Y = * factor
Y = E
factor = ~ factor
factor - power
power = atom X
X = ** power
X = E
atom = NUM
term
factor
Y
power
atom
X
Answer to Activity - Required Info For Parsing Table
FIRST Sets of RHS
RHS Nullable
Answer to Activity - Top-Down Parse Table
**
NUM
FOLLOW Sets of LHS
$

Transcribed Image Text:Class Activity
Consider the following partial context-free grammar, in which
• The non-terminal "term" is the start symbol.
• NUM is a terminal.
The star (*) and the double-star (**) symbols are different terminals. Treat ** as one terminal symbol.
We want to design a top-down parsing algorithm. We need to perform the following tasks,
Determine Nullable values
• Determine FIRST sets
Determine FOLLOW sets
Create parse table
term = factor Y
Y = * factor | E
factor=~factor | power
power = atom X
X = ** power &
atom = NUM
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