Concepts of Programming Languages (11th Edition)
11th Edition
ISBN: 9780133943023
Author: Robert W. Sebesta
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Expert Solution & Answer
Chapter 4, Problem 3PS
Explanation of Solution
Trace of the recursive descent parser for the string:
STEP-1:
Next token is: 11 Next lexeme is a
Enter
Enter
Enter <factor>
STEP-2:
Next token is: 21 Next lexeme is +
Exit
Exit
STEP-3:
Next token is: 11 Next lexeme is b
Enter
Enter
STEP-4:
Next token is: 23 Next lexeme is x
Exit
STEP-5:
Next token is: 11 Next lexeme is c
Enter
STEP-6:
Next token is -1: Next lexeme is EOF
Exit
Exit
Exit
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
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Implement in Scheme using map and foldl. DO NOT use recursive definition for this problem.
Define a function lstOR, which takes a list of Booleans and returns #f if and only if all of the Booleans are false. For your convenience, (lstOR 0 ()) is defined as #f. For example,
(lstOR '(#t #f)) ; returns #t
(lstOR '(#f #f)) ; returns #f
(lstOR '()) ; returns #f
Draw the results of using the recursive ruler-drawing algorithm for thesevalues of the arguments: rule(0, 11, 4), rule(4, 20, 4), and rule(7, 30, 5).
Give a recursive definition for the set of all strings of 0’s and 1’s that have either twice the number of 0's as 1's or twice the number of 1's as 0's.
Chapter 4 Solutions
Concepts of Programming Languages (11th Edition)
Ch. 4 - Prob. 1RQCh. 4 - Prob. 2RQCh. 4 - Prob. 3RQCh. 4 - Prob. 4RQCh. 4 - Prob. 5RQCh. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Prob. 8RQCh. 4 - Prob. 9RQCh. 4 - Prob. 10RQ
Ch. 4 - Prob. 11RQCh. 4 - Prob. 12RQCh. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Prob. 15RQCh. 4 - Prob. 16RQCh. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - Prob. 19RQCh. 4 - Prob. 20RQCh. 4 - Prob. 21RQCh. 4 - Prob. 22RQCh. 4 - Prob. 23RQCh. 4 - What was Knuths insight in developing the LR...Ch. 4 - Prob. 25RQCh. 4 - Prob. 26RQCh. 4 - Is left recursion a problem for LR parsers?Ch. 4 - Prob. 1PSCh. 4 - Prob. 2PSCh. 4 - Prob. 3PSCh. 4 - Prob. 4PSCh. 4 - Prob. 7PSCh. 4 - Prob. 8PS
Knowledge Booster
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
- Give a recursive definition of a set of all strings over an alphabet {a,b} that contain exactly one b.arrow_forwardShow the function f(i; k) is primitive recursive where f(i; k) = Pi.Pi+1............Pi+k. Recall, Pn is the nth prime number and P0 = 0.arrow_forwardExercise 1.A set W of strings of symbols is defined recursively by a, b, and d belong to W. If x belongs to W, so does a(x)d. Provide 3 strings made of 3 letters each belonging to W and show the procedure used to obtain them. Provide 3 strings made of at least 5 letters each belonging to W and show the procedure used to obtain them.arrow_forward
- Write down a recursive definition of the set A that consists of all binary strings that satisfy all of the following properties: -> the string ends with 0, and -> the string has length at least two, and -> the length of the string is even.arrow_forwardGive a recursive definition for an (where n=1,2,3,...) if an=2n+5arrow_forwardGive a recursive definition for the set of all strings of a’s and b’s that begins with an a and ends in a b. Say, S = { ab, aab, abb, aaab, aabb, abbb, abab..} Let S be the set of all strings of a’s and b’s that begins with a and ends in a b. The recursive definition is as follows – Base:... Recursion: If u ∈ S, then... Restriction: There are no elements of S other than those obtained from the base and recursion of S.arrow_forward
- Define the rule echo(LST0, LST1). This rule describes LST1, which holds all the same elements as LST0, except that they are all repeated. You should expect LST0 and LST1 to always be nonempty lists. Please answer in GNU prologarrow_forwardanswer b2 and Rarrow_forwardThis problem considers strings that can be made from the alphabetA= {‘a’, ‘b’, ‘c’}.a. Write a recursive definition for the set of strings that have at least one 'a' character.b. Write a recursive definition for the set of strings that do not start with the letter 'a'.arrow_forward
- In Kotlin, Write a recursive function with an expression body that takes an Int n and returns a list of the areas of circles for each radius from n to 1 (in decreasing order.) Get the areas by calling the area function. Then rewrite the recursive function so that the areas appear in increasing order. You do not need to use tail recursion in this casearrow_forward16. Give a recursive definition for the set of all strings of 0's and l's for which all the O's precede all the l's.arrow_forwardWrite a recursive function to generate nth fibonacci term in C programming. How to generate nth fibonacci term in C programming using recursion. Logic to find nth Fibonacci term using recursion in C programming. Fibonacci series is a series of numbers where the current number is the sum of previous two terms. For Example: 0, 1, 1, 2, 3, 5, 8, 13, 21, ... , (n-1th + n-2th) Example: Input: Input any number: 10 Output 10th Fibonacci term: 55 please use C languagearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
C++ Programming: From Problem Analysis to Program...Computer ScienceISBN:9781337102087Author:D. S. MalikPublisher:Cengage Learning
C++ Programming: From Problem Analysis to Program...
Computer Science
ISBN:9781337102087
Author:D. S. Malik
Publisher:Cengage Learning