Concepts Of Programming Languages
12th Edition
ISBN: 9780134997186
Author: Sebesta, Robert W.
Publisher: Pearson,
expand_more
expand_more
format_list_bulleted
Expert Solution & Answer
Chapter 4, Problem 15RQ
Explanation of Solution
Top-down Parser:
A grammar which has the following characteristics cannot be used as the basis for a top-down parser:
1) A grammar with direct or indirect left recursion.
2) A grammar which fails in pairwise disjointness test.
1) A grammar with direct or indirect left recursion:
- Example for grammar with direct left recursion: AA+B, where in a rule for a particular non terminal, the non-terminal on the LHS comes on the leftmost symbol on its RHS too.
- Example for grammar with indirect left recursion: - ABaA, AAb, where in a rule for a particular non terminal, the non-terminal comes as the leftmost symbol on its RHS can be expanded to get a string which in turn can be expanded (using rule for the left most symbol) to get that particular non terminal itself on the left most part.
In a grammar with left recursion, the first non-terminal when expanded from RHS we get the same non terminal of LHS in the grammar rule directly or indirectly. In a top down parsing since the next sentential form is obtained by expanding the left most non terminal, presence of left recursion results in indefinite recursive calls...
Expert Solution & Answer

Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Need help with this in python!
Need help with this in python!
Help! How do I turn the flowchart that searches for a name in an array of names into structured and spaced pseudocode?
Chapter 4 Solutions
Concepts Of Programming Languages
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
Similar questions
- The mail merge process has ____ steps. Question 19Select one: a. five b. six c. seven d. eightarrow_forwardIf you created a main document based on an existing document entitled "Confirmation Letter," what default filename would Word give the main document? Question 14Select one: a. Confirmation Letter-1 b. Confirmation Letter-merge c. Document1 d. MergedDocument1arrow_forwardClick the ____ option button in the Mail Merge task pane to use an Outlook contact list as a data source for a merge. Question 11Select one: a. Use Outlook contacts list b. Select from Outlook contacts c. Select Contacts d. Mail Merge Recipientsarrow_forward
- A(n) ____ cannot be selected as the document type in the Mail Merge task pane. Question 9Select one: a. Letter b. Directory c. Fax d. E-mail messagearrow_forwardConsider a Superstore Database which consists of 3 tables, Orders, Returns, and Managers. The CSV files have been provided along with this DOC file in the Midterm 2 Link in the Moodle. Answer the questions as below: Use the created table as in the provided SQL query file, solve the problems as mentioned below. You will have to import the respective CSV files of the above created tables as without them, it is impossible to solve the questions below. If you are not able to upload the files successfully, do not leave the query questions. Just write the query to the best of your knowledge. Do not copy. To be graded for the screenshot answer, you must upload the CSV properly and paste the resulting screenshot of the queries as asked. Write Query to Find out which Product Sub-Category has a sum of Shipping Cost to sum of Sales ratio > 0.03.arrow_forwardI need to render an image of a car continuously for a smooth visual experience in C# WinForms. It gets the location array (that has all the x,y of the tiles it should visit) from another function - assume it is already written.arrow_forward
- write c program with features: Register a Bunny: Store the bunny's name, poem, and initialize the egg count to 0. Modify an Entry: Change the bunny's poem or update the egg count. Delete a Bunny: Remove a registered bunny from the list. List All Bunnies: Display all registered bunnies and their details. Save & Load Data: Store bunny data in a file to persist between runs. Use a struct to represent a bunny contestant. Store data in a binary file (bunnies.dat) for persistence. Use file I/O functions (fopen, fwrite, fread, etc.) to manage data. Implement a menu-driven interface for user interaction.arrow_forwardHelp, how do I write the pseudocode for the findMean function and flowchart for this?arrow_forwardNeed help drawing a flowchart for the findMax function herearrow_forward
- Need help writing the pseudocode for the findMin function with attachedarrow_forwardCreate a static function in C# where poachers appear and attempt to hunt animals. It gets the location of the closest animal to itself. Take account of that the animal also move too, so it should update the closest location (x, y) everytime it moves to a new location. Use winforms to show the movements of poachers.arrow_forwardCreate a static function in C# where poachers appear and attempt to hunt animals. It gets the location of the closest animal to itself. Take account of that the animal also moves too, so it should update the closest location (x, y) everytime it moves to a new location. Use winforms to show to movementsarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Np Ms Office 365/Excel 2016 I NtermedComputer ScienceISBN:9781337508841Author:CareyPublisher:CengageEBK JAVA PROGRAMMINGComputer ScienceISBN:9781305480537Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
- Programming Logic & Design ComprehensiveComputer ScienceISBN:9781337669405Author:FARRELLPublisher:CengageProgramming with Microsoft Visual Basic 2017Computer ScienceISBN:9781337102124Author:Diane ZakPublisher:Cengage LearningEBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
Np Ms Office 365/Excel 2016 I Ntermed
Computer Science
ISBN:9781337508841
Author:Carey
Publisher:Cengage

EBK JAVA PROGRAMMING
Computer Science
ISBN:9781305480537
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
Programming Logic & Design Comprehensive
Computer Science
ISBN:9781337669405
Author:FARRELL
Publisher:Cengage

Programming with Microsoft Visual Basic 2017
Computer Science
ISBN:9781337102124
Author:Diane Zak
Publisher:Cengage Learning

EBK JAVA PROGRAMMING
Computer Science
ISBN:9781337671385
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT