Pearson eText for Concepts of Programming Languages -- Instant Access (Pearson+)
Pearson eText for Concepts of Programming Languages -- Instant Access (Pearson+)
12th Edition
ISBN: 9780135102268
Author: Robert Sebesta
Publisher: PEARSON+
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Chapter 3, Problem 7RQ

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Extended Backus Normal Form:

Backus Normal Form or Backus-Naur Form (BNF) is one of the notation techniques for context free grammars, used to describe the syntax of languages used in programming languages. They are used when exact descriptions of languages are needed, as in official language specifications, in manuals of programming language.

EBNF means Extended Backus-Naur Form. The work extensions do is to enhance the descriptive power of BNF as in readability and writability.

Three common extensions:

The first extension denotes an optional part of a RHS, which is delimited by brackets.

For example, a C language if-else statement can be described as:

If (statement) if {statement}

else {statement}

It’s a simpl

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