Suppose that a PL permits only identifiers that begin with a letter, contain at least one but not more than three digits, and can have any number of letters. (a) Give a BNF grammar for such a set of identifiers. Assume the following productions for letters and digits: --> alb|c]...]z --> 0|1|2...|9

Suppose that a PL permits only identifiers that begin with a letter, contain at least one but not more than three digits, and can have any number of letters. (a) Give a BNF grammar for such a set of identifiers. Assume the following productions for letters and digits: --> alb|c]...]z --> 0|1|2...|9

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

See similar textbooks

Related questions

Q: Consider the following context-free grammar G Sasa | bSb laDb | bDa D → aD | bD | E a) Give the…

A: A context-free grammar is a set of recursive rules used to generate patterns of strings. A…

Q: Write a BNF grammar for identifiers that consist of an arbitrarily long string of letters and…

A: BNF grammar to describe the structure of identifiers Backus Naur Form (BNF): Syntax of the…

Q: Consider the details given below. What is the result if Arden's Rule is applied to equation 1? *…

A: Lets talk about Ardens Rule Let P and Q be two regular expressions over ∑ If P does not contain a…

Q: Greibach normal form grammar

Q: What is meant by the elimination of epsilon (E) productions? Also eliminate E-productions from the…

A: The Answer is in given below step

Q: Eliminate all lambda productions, unit productions, and useless productions from the following…

A: Eliminate lambda productions, unit productions, and useless productions from the given grammar is…

Q: Explain the difference between pumping lemma for regular languages and pumping lemma for context…

A: The question is to explain the difference between pumping lemma for regular languages and pumping…

Q: Context Free Grammar State whether it is ambiguous or unambiguous. If it is ambiguous give an…

A: The below grammar expresses the concept of string concatenation, wherein the symbols "a" and "b" can…

Q: Show that the following context-free grammar is ambiguous S aSSb | ab | ba by exhibiting a string in…

A: We are given a context free grammar and we are going to prove that the given grammar is ambiguous.…

Q: Please explain how you solve the follwing problem:

A: The context free grammar is given below. To convert it into Chomsky normal form, some rules must be…

Q: Exercise 4 For each of the grammars in Exercise 3 except the last, give an unam- biguous grammar for…

A: Introduction of Formal Language: A formal language is a set of strings of symbols or characters…

Q: E->E*T | E/T | E+T | E-T | T T->(E) T->id T->num a. make a semantic rule using s-atribut b.…

A: Answer: Our instruction is answer the first three part from the first part and . I have given…

Q: ANNSWER BY TRUE OF FULSE: (No need to explain as I already know the answer but I want to check my…

A: All possible patterns of strings can be represented with the help of CFG i.e., context free…

Q: Please explain how you solve the follwing problem:

A: a) CHAIN set for each variable:CHAIN(S) = {B, C, A}CHAIN(A) = {A}CHAIN(B) = {B}CHAIN(C) = {C, A}

Q: ou are required to give a grammar and an accepted for such a set of identifiers of a programming…

A: Answer:

Q: grammar that generates the language L = {anbmambn |n, m ∈N}. List all variables (non-terminals) and…

A: Consider the given grammar : L = {anbmambn |n, m ∈N}.

Q: 4. Given the language L = {wxwR: w ∈ {a, b}*, x is a fixed terminal symbol}, answer the following…

A: L = {wxwR: w ∈ {a, b}*, x is a fixed terminal symbol}

Q: Rules term = factor Y $ Y = * factor Y = E factor = ~ factor factor = power power = atom X X = **…

A: Here are the Follow sets for the given grammar:

Q: . Consider the following context-free grammar with start symbol S, nonterminals {S, A, B, C}, and…

A: The question asks to compute the FIRST and FOLLOW sets for each nonterminal in a given context-free…

Q: Write an unambiguous BNF grammar, define attributes for the grammar symbols and attach attribute…

A: Here is the unambiguous BNF grammar for assignment statements with arithmetic expressions:

Concept explainers

Intelligent Machines

Machines that use artificial intelligence to learn from the environment and past experiences to perform better in the presence of variability and uncertainty are called intelligent machines. Intelligence develops according to environment and experience. It is human-like behavior. When the computer system or any programmed machine learns from the inputs and corresponding outputs, it can be called an intelligent machine.

Question

Give a grammar and accepter for such et of identifiers. And also define the production rule by starting S->

Suppose that a PL permits only identifiers that
begin with a letter, contain at least one but not
more than three digits, and can have any number
of letters.
(a) Give a BNF grammar for such a set of
identifiers. Assume the following productions for
letters and digits:
<L> --> a|b|c...|z <D> --> 0[1|2|..19

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

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

24. Show that the grammars and are not equivalent. S→ aSbbSa|SS|a SaSbbSala
4. Construct a Chomsky normal form grammar for L(G) for the following cfg G: G=({S,B}, {a,b,c,d}, {S→BdSaSaS|BSS|b, B->cSda|S|dcb}, S). Note: You must first remove all unit productions.
For the following grammar, write next to each production all of the set constraints you can deduce from it. Omit tautologies. S' - S$ S- AB A→ a Ab В — ЬВа В — л
3. Feature grammars, semantics (a) Consider the following context-free grammar: S + NP VP VP → VNP NP → he she | him | her → likes V Augment this grammar to become a unification-based (feature-based) grammar, by adding a 'case' feature, and constraints to enforce case agreement, to restrict the language to only those sentences that are correct English. You can use the notation used in the lectures or the notation of NLTK.
Problem 3 Show that the following language is decidable: INFINITECEG = {(G) |G is a context-free grammar such that L(G) is infinite}
Context Free Grammar State whether it is ambiguous or unambiguous. If it is ambiguous give an equivalent unambiguous grammar. If it is unambiguous, state all the precedences and associativities enforced by the grammar. 1. <S > -> <S > - <T > | <T > - <S > | <T ><T > -> N + <T > | N | ( <S >)
NAT Lang processing: Please explain in detail Consider a CFG representing a phrase structure grammar for a natural language such as English, including the following rule (the period is part of the rule): S -> NP VP . In this rule, S, NP, and VP are non-terminal symbols, but we will assume that the period is a terminal symbol specifically representing a period (as opposed to some other end-of-sentence marker). So, we can interpret this rule as stating that a sentence can have the form of a noun phrase followed by a verb phrase followed by a period. (To implement a parser for grammars with rules like this, the tokenizer would have to treat periods as separate tokens.) Assume that you need to convert this grammar to Chomsky normal form (CNF), perhaps with the CKY parsing algorithm in mind. Using the procedure discussed in class, show the rules that might result from the conversion.