Consider the following grammar (G1) for simple assignment statements. (The symbols that begin with upper-case letters are variables and Assign is the start variable.) Assign → Id Expr Id → abc Expr → Expr := Expr | Expr * Expr |(Expr) | Id - a) Give a (leftmost) derivation for string a := b * a - c. b) Give a parse tree for string a := b * a - c.
Consider the following grammar (G1) for simple assignment statements. (The symbols that begin with upper-case letters are variables and Assign is the start variable.) Assign → Id Expr Id → abc Expr → Expr := Expr | Expr * Expr |(Expr) | Id - a) Give a (leftmost) derivation for string a := b * a - c. b) Give a parse tree for string a := b * a - c.
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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Transcribed Image Text:. Consider the following grammar (G1) for simple assignment statements. (The symbols that
begin with upper-case letters are variables and Assign is the start variable.)
Assign Id := Expr
Id → abc
Expr
| Expr * Expr
|(Expr)
| Id
Expr → Expr
a) Give a (leftmost) derivation for string a := b ⋆ a — c.
b) Give a parse tree for string a := b ⋆ a — c.
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