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< program > → : < variable declaration section>→int variable list →→variable list, identifier | identifier < statements section>→→< statements section statement>; ; < statement > → → identifier =

< program > → : < variable declaration section>→int variable list →→variable list, identifier | identifier < statements section>→→< statements section statement>; ; < statement > → → identifier =

Database System Concepts
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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Finish rewriting the programming language on page 7 to LL1 grammar. ( Then, start programming a parser based on this LL1 grammar )

Result: < program >→→ <variable declaration section>; <statements section> < variable declaration section> int <variable list> < variable list >→< variable list >, identifier | identifier < statements section → statements section statement>; <statement>; < statement > → <assignment statement>|<conditional statement>|<iteration statement> < assignment statement >→ identifier = <expression> < conditional statement >→→ if (< condition>) then <nested statement>; else ‹ nested statement > < iteration statement >→ while (< condition>) do nested statement > < expression > →→< item >|< expression >+ <item> < item > → <factor>|< item >*< factor > < factor > → identifier | integer | (< expression>) < condition > →< expression> logical_operator < expression> < compound statement > → begin statements section > end < nested statement > → <statement> <compound statement> Possible problem: left recursion: endless loop -> left recursion elimination multiple productions: backtracking wastes time -> first and follow set ● < . 7
Transcribed Image Text:Result: < program >→→ <variable declaration section>; <statements section> < variable declaration section> int <variable list> < variable list >→< variable list >, identifier | identifier < statements section → statements section statement>; <statement>; < statement > → <assignment statement>|<conditional statement>|<iteration statement> < assignment statement >→ identifier = <expression> < conditional statement >→→ if (< condition>) then <nested statement>; else ‹ nested statement > < iteration statement >→ while (< condition>) do nested statement > < expression > →→< item >|< expression >+ <item> < item > → <factor>|< item >*< factor > < factor > → identifier | integer | (< expression>) < condition > →< expression> logical_operator < expression> < compound statement > → begin statements section > end < nested statement > → <statement> <compound statement> Possible problem: left recursion: endless loop -> left recursion elimination multiple productions: backtracking wastes time -> first and follow set ● < . 7
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