Concepts Of Programming Languages
Concepts Of Programming Languages
12th Edition
ISBN: 9780134997186
Author: Sebesta, Robert W.
Publisher: Pearson,
bartleby

Concept explainers

Expert Solution & Answer
Book Icon
Chapter 4, Problem 4PS

Explanation of Solution

Extended Backus-Naur Form (EBNF):

BNF is a natural notation for describing syntax described by John Backus and Peter Naur. By extending it, we had EBNF which only enhances the readability and writability of BNF.

The recursive descent parser works on the following EBNF for the arithmetic expressions:

{(+|-)}

{(*|/)}

id|int_constant|()

We know that, the following tokens are returned by the lexical analyzer for the lexemes:

TokenLexeme
11Identifier
21+ Operator
23* Operator
25(
26)

In the table the left column having the heading token refers to the token codes to the different types of the categories like:-

a) 11 = identifier

b) 21 =ADD operator

c) 23 = MULTIPLY operator

d) 25 = left brace lexeme

The example given in the problem is a(b+c). The recursive descent parser will start working from the left most term. First the whole statement is taken as an expression and it enters into expression category then the first term is taken which enters into the term category which further enters into the factor group

Blurred answer
Students have asked these similar questions
Just need some assistance with number 3 please, in C#
How do we find the possible  final values of variable x in the following program.   Int x=0; sem  s1=1, s2 =0;   CO P(s2); P(s1); x=x*2; V(s1); // P(s1); x=x*x; V(s1); // P(s1); x=x+3; V(s2); V(s1); Oc
Lab 07: Java Graphics (Bonus lab) In this lab, we'll be practicing what we learned about GUIs, and Mouse events. You will need to implement the following: ➤ A GUI with a drawing panel. We can click in this panel, and you will capture those clicks as a Point (see java.awt.Point) in a PointCollection class (you need to build this). о The points need to be represented by circles. Below the drawing panel, you will need 5 buttons: о An input button to register your mouse to the drawing panel. ○ о о A show button to paint the points in your collection on the drawing panel. A button to shift all the points to the left by 50 pixels. The x position of the points is not allowed to go below zero. Another button to shift all the points to the right 50 pixels. The x position of the points cannot go further than the You can implement this GUI in any way you choose. I suggest using the BorderLayout for a panel containing the buttons, and a GridLayout to hold the drawing panel and button panels.…
Knowledge Booster
Background pattern image
Computer Science
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
C++ Programming: From Problem Analysis to Program...
Computer Science
ISBN:9781337102087
Author:D. S. Malik
Publisher:Cengage Learning
Text book image
C++ for Engineers and Scientists
Computer Science
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Course Technology Ptr
Text book image
Operations Research : Applications and Algorithms
Computer Science
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Brooks Cole
Text book image
Systems Architecture
Computer Science
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Cengage Learning
Text book image
Programming Logic & Design Comprehensive
Computer Science
ISBN:9781337669405
Author:FARRELL
Publisher:Cengage
Text book image
LINUX+ AND LPIC-1 GDE.TO LINUX CERTIF.
Computer Science
ISBN:9781337569798
Author:ECKERT
Publisher:CENGAGE L