Rules term = factor Y $ Y = * factor Y = E factor = ~ factor factor = power power = atom X X = ** power X = E atom = NUM Answer to Activity - Determine FOLLOW Relations Notes FOLLOW Sets

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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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
Rules
term = factor Y $
Y = * factor
Y = E
factor = ~ factor
factor = power
power = atom X
X = ** power
X = E
atom = NUM
term = factor Y
Y = * factor | E
factor=~factor | power
power = atom X
X = ** power | E
atom = NUM
Answer to Activity - Determine FOLLOW Sets
FOLLOW Relations
Notes
FOLLOW Sets
Transcribed Image Text: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 Rules term = factor Y $ Y = * factor Y = E factor = ~ factor factor = power power = atom X X = ** power X = E atom = NUM term = factor Y Y = * factor | E factor=~factor | power power = atom X X = ** power | E atom = NUM Answer to Activity - Determine FOLLOW Sets FOLLOW Relations Notes FOLLOW Sets
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