boolval denotes the token for Boolean literal (e.g., true, false).A denotes the Boolean AND operator, and O denotes the Boolean OR operator.You are given the following BNF grammar: → boolval| A | 0 (a) Draw the parse tree of this expression:A true O 0 false true A true false(b)According to the token(s) and the grammar rule(s) mentioned in the beginning ofQuestion 2, write a grammar file that can be used in SableCC.

Given that, boolval denotes true, false. A represents Boolean AND operator O represents Boolean OR…

boolval denotes the token for Boolean literal (e.g., true, false). A denotes the Boolean AND operator, and O denotes the Boolean OR operator. You are given the following BNF grammar: → boolval A | O (a) Draw the parse tree of this expression: A true O 0 false true A true false (b)According to the token(s) and the grammar rule(s) mentioned in the beginning of Question 2, write a grammar file that can be used in ŞableCC.

boolval denotes the token for Boolean literal (e.g., true, false). A denotes the Boolean AND operator, and O denotes the Boolean OR operator. You are given the following BNF grammar: → boolval A | O (a) Draw the parse tree of this expression: A true O 0 false true A true false (b)According to the token(s) and the grammar rule(s) mentioned in the beginning of Question 2, write a grammar file that can be used in ŞableCC.

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

Similar questions

Consider the ambiguous grammar S → ABS | ABA → aA | λB → bB | λ What is the shortest string in L(S) other than λ that can be used to show the grammar is ambiguous? Write the string without any spaces or quotation marks. Now show the grammar ambiguous by giving two derivations for the string (each derivation should have a particular important property). Give the two shortest derivations you can find, writing the shorter one in the first box. Your derivations should begin with S, end with your chosen string, and only make one substitution per step. Do not include any spaces, quotes, or lambdas in your answer. Use the ">" character to represent the right arrow. For example, S>aSb>ab might be a legal derivation for a string in another language.
Consider the grammar G below in the input alphabet {num, *, /, -}, with non-terminal leading S' in rule 1. S'→S$ S→E - F F→E * E E→num E→num / num a) Build the G grammar automaton. Is this grammar LR(0)? b) If G is not LR(0), list the items present in the DFA state where the conflict occurs. c) Is this grammar SLR? d) If G is SLR, write the non-terminal follow that resolves the LR(0) conflict. (Separate the items in the set with “:”. Ex: a:b )
Consider the context-free grammar S → ABS | ABA → aA | aB → bB | b Give a leftmost derivation of the string "abab". Your derivations should begin with S, end with abab, and only make one substitution per step. Do not include any spaces, quotes, or lambdas in your answer. Use the ">" character to represent the right arrow. For example, S>aSb>ab might be a legal derivation for a string in another language. Hints: > should appear six times in your answer.
The parser is used to construct sentences out of words in a natural language by a context-free grammar (CFG) that considers the two subsets known as LL(1) and LR(1) grammars. What is the difference between LL(1) and LR(1) grammars. Find out whether the following grammar is LL(1) or not:
Write a context free grammar generating the language{0^(3a) 1 ^ (2b) 0^ (2b) 1^ (a) :a >0, b >0}.Please check your solution by actually generating an example word from your grammar.
L = {(a^n)(b^m)(c^k) ; n = m or m ≠ k } Find context free grammars (with n, m, k greater than or equal to 0)
Consider the grammar with start symbol sentence, set of terminals T = {the, sleepy, happy, tortoise, hare, passes, runs, quickly, slowly}, set of nonterminals N = {noun phrase, transitive verb phrase, intransitive verb phrase, article, adjective, noun, verb, adverb}, and productions: sentence → noun phrase transitive verb phrasenoun phrasesentence → noun phrase intransitive verb phrasenoun phrase → article adjective nounnoun phrase → article nountransitive verb phrase → transitive verbintransitive verb phrase → intransitive verb adverbintransitive verb phrase → intransitive verbarticle → theadjective → sleepyadjective → happynoun → tortoisenoun → haretransitive verb → passesintransitive verb → runsadverb → quicklyadverb → slowly Identify five valid sentences that can be formed using the given productions. (Check all that apply.) Check All That Apply A) the sleepy hare runs quicklythe sleepy hare runs quickly B) the happy hare quickly runsthe happy hare quickly runs C) the…
Let Σ={0,1,a}. The language L that we are interested in is all and only the strings that do NOT contain the substring 01. We can write a context-free grammar (CFG) for it: S → 0A | 1S | aS | ε A → 0A | aS | ε Informally explain the two parts of the expression “all and only the strings.” How do we know that we get all the strings of L by this grammar? And, how do we know that we get only the strings of L by this grammar?
Give the derivation tree for ((a+b)∗c+d, using the grammar in Example 5.12. EXAMPLE 5.12 To rewrite the grammar in Example 5.11 we introduce new variables, taking V as {E, T, F, I}, and replacing the productions with E→T,T→F,F→I,E→E+T,T→T*F,F→(E),I→a|b|c.E→T,T→F,F→I,E→E+T,T→T*F,F→(E),I→a|b|c. A derivation tree of the sentence a + b ∗ c is shown in Figure 5.6. No other derivation tree is possible for this string: The grammar is unambiguous. It is also equivalent to the grammar in Example 5.11. It is not too hard to justify these claims in this specific instance, but, in general, the questions of whether a given context-free grammar is ambiguous or whether two given context-free grammars are equivalent are very difficult to answer. In fact, we will later show that there are no general algorithms by which these questions can always be resolved.
1. Draw a parse tree for the string ddadddd using buttom-up and Top-down methods with the Context-Free Grammar below:Q → dQbb | FF → aF | ε 2. What is the problem with a grammar that generates two different parse trees? Give an example. 3. Differentiate between top-down and bottom-up parsing methods using a typical grammar. 4. Write a regular expression to describe inputs over the alphabet {a, b, c} i) that are in sorted order ii) containing at least one a and at least one b 5. Construct the NFA that will accept the string of (dc|ac)* dc (gg|bb)*dc.
Grammar and its application to FractalsLet G=(N,T,P,∑) where ∑ is the start symbol, N = {D}, T = {d, r, l}, andP = {∑→D, D→DrDllDrD, D → d} 1. Give the most specific type of grammar G.2. Show the leftmost derivation sequence of the string drdlldrd, (i.e. When deriving a new sentential form, always replace one Nonterminal at a time and always replace the leftmost Nonterminal)3. Suppose d is an abstraction of a command to draw a straight line of fixed length in the current direction, r is an abstraction of a command to turn right by 60 degrees, and l is an abstraction of a command to turn left by 60 degrees. Assuming that you are to start from a point and that the starting direction is to proceed horizontally to the right, show the figure represented by the generated string drdlldrd.4. The string drdlldrdrdrdlldrdlldrdlldrdrdrdlldrd can also be generated. Assuming that you are to start from a point and that the starting direction is to proceed horizontally to the right, show the figure…
Consider the following grammar S → - F | F F → D | D . D D → N | N D N → 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 Recursive Descent Procedures Draw Syntax Diagrams for the non-terminals Note: In the above grammar consider “.” and “-“ as terminals too.