Given the following grammar for a Very Simple Programming Language (VSPL): :={} :: ; |; :: call: compute: ::-id () :: , | ::-id-+ |id=- |id= The following grammar symbols are terminals: { } ; call compute : id num Below is a sample program written in VSPL: compute: a = 15; compute: b = 20; compute: c = a +b; call: foo (a,b,c); call: bar (c, 20);

Given the following grammar for a Very Simple Programming Language (VSPL): :={} :: ; |; :: call: compute: ::-id () :: , | ::-id-+ |id=- |id= The following grammar symbols are terminals: { } ; call compute : id num Below is a sample program written in VSPL: compute: a = 15; compute: b = 20; compute: c = a +b; call: foo (a,b,c); call: bar (c, 20);

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

Answer the given question with a proper explanation and step-by-step solution.

Given the following grammar for a Very Simple Programming Language (VSPL):
<program>
::={<statement_list>}
<statement list> :: <statement>; <statement list>
<statement> ::=call: <procedure_call>
compute: <expression>
<procedure_call>::=id (<parameters>)
<parameters> ::=<factor>,<parameters>
|<factor>
<expression>
|<statement>;
<factor> ::=id|num
The following grammar symbols are non-terminals:
<program>
<statement>
<statement_list>
}
;
call
compute
::=id=<factor>+<factor>
|id=<factor>-<factor>
:
<procedure_call>
<Parameters>
<expression>
<Factor>
The following grammar symbols are terminals:
)
|id=<factor>
9
id
num
=
Below is a sample program written in VSPL:
{
compute: a = 15;
compute: b = 20;
compute: c = a + b;
call: foo (a b, c);
call: bar (c, 20);

Convert the VSPL context free grammar into an LL(1) grammar. Make all the necessary adjustments (if
any are needed). Please assume that the grammar is not ambiguous. Therefore, you just need to eliminate
left recursion and perform left factoring.

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