Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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CONTEXT FREE GRAMMAR:-
A context-free grammar is a set of rules that define how to form strings in a language. It consists of a set of terminal symbols, which are the characters that appear in the strings of the language, and a set of nonterminal symbols, which are placeholders for patterns of characters. The rules specify how to replace each nonterminal symbol with a string of terminal symbols.
For example, the following context-free grammar defines the language of all strings that consist of a sequence of zero or more a's followed by a sequence of zero or more b's:
Terminals: a, b
Nonterminals: S
Rules:
S → ε
S → aS
S → bS
S → ab
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- The Context Free Grammar below is given: G=( {S,a,b}, {0,1}, S, {S⇒0b|1a, a→0|0s|1aa|ɛ, b→1|1s|Obb}) Which string(s) could belong to the language generated by this grammar? 101110111 ☐ 10010100 0100101110 0000100001arrow_forwardGive an unambiguous grammar that generates the set of all regular expressions on E = {a,b}.arrow_forwardGive a context free grammar for the set L={a^n b^m | n=m or 2n=m where n, m ≥ 0}.arrow_forward
- Consider the context-free grammar S- A$ A→ aAa | B B → bbB | A In each of the following questions list your set in alphabetical order with $ at the end of the list if it's included. Separate items using commas and no spaces. For example: x,y,$. If a set is empty write "empty". What is in First(S)? { What is in First(A)? { } What is in First(B)? { } What is in Follow(S)? { What is in Follow(A)? { } What is in Follow(B)? { }arrow_forwardPlease give unique answer and do not copy paste from chegg! thank youarrow_forwardComputer Science Consider the following two grammars with alphabet a and b i. (b*ab*a)*b* ii. (b*ab*a)*b*(b*ab*a)*b* Are there any strings are generated by one of the grammars and cannot be generated by the other? If there are more than one such string, how do you describe them.arrow_forward
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