a context free grammar
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Create a context free grammar for each of the following
languages.
a. L = { a i b j | i < j }
b. L = { a i b j ck d l | 0 < j < i, 0 < l < k }
c. L = { a i b j ck d l | i = l, j < k }
Step by step
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- 3. Given the following BNF grammar: -> d c | cd -> a la -> b | b Use the top-down recursive descent method which we discussed in the class to implement a parser (i.e. tdrd.parser.py) in python3 for the above BNF grammar. The input data file name is given from the command line. You may assume that there is a space character between two terminals (e.g. a a adc b ) in the data file.2. A piece of declaration code in C programming language is as follows: typedef struct { int a, b; } CELL, *PCELL; CELL foo[100]; PCELL bar ( int x, CELL y ); Write the type expression for foo and bar. 3. Write an SDT for the following grammar, which can perform type checking. The type of S is the valid type of its body. S -> id := E | if E then S | while E do S | S; SUsing Java, write a program that reads as input an arbitrary context-free grammar from a text file and then derives/enumerates five strings from the grammar. The file cfg.txt can be used to test your program. The grammar represented in cfg.txt is the following grammar for non-palindromes (from input alphabet {a,b}): S -> aSa | bSb | XX -> aYb | bYaY -> aY | bY | lambdaThis is formatted in cfg.txt as follows: S aSaS bSbS XX aYbX bYaY aYY bYY *An asterisk is used for lambda. Assume that the first state listed in the input file is the start state. Read the grammar into a map (aka hash or dictionary) where the key is a variable and the value is a list of right-hand sides. If you are using Java, you could use Hashtable by declaring a Hashtable of the following type:Hashtable<String, ArrayList<String>>Do not write the program specific to this grammar in cfg.txt. Further, assume that the test file will have more than three variables, and productions on the right hand side…
- Rewrite the grammar so that it is not ambiguous any more. <S> -> <A> <A> -> <A> + <A> | <id> <id> -> a | b | cI need help creating a context free grammar that can develop multiple sentences it must be done in Java with the following 1. Identifying the syntax and grammar rules of American English: This involves analyzing the grammatical structure of sentences in American English and identifying the different parts of speech and how they are used in sentences. 2. Developing a set of context-free grammar rules: Based on the analysis of American English syntax and grammar, develop a set of context-free grammar rules that can be used to generate valid sentences in American English. a. Defining a set of nonterminal symbols that represent parts of speech, such as nouns, verbs, adjectives, adverbs, and prepositions. b. Defining a set of terminal symbols that represent words in the English language. c. Defining production rules that describe how nonterminal symbols can be expanded into other nonterminal symbols and terminal symbols. 3. Implementing a parser for the context-free grammar using…11. L= {w|w E (0,1)* and |w| is even} 12. L = {w|w E (0,1)* and |w| is odd} 13.{ a"b"c"d" |n odd, m even }
- Build a grammar that generates the language [0-9]+\.?[0-9]* Build a grammar that generates the language that accepts odd numbers in binary.Let E = {a, b, c}. Write a grammar that generates the language: L = {c"ww* a":n > 0, m > 0, w e E+} HTML EditorÉ B I UA A 工E 三三 x x, : You Tube T T 12pt Paragraph G= ( {S,A}, {a,b,c}, S, P) P: S-> cSalcAa A->aAa|cAc 18 wordsComplete the following context free grammar for the following language. Please ASAP
- 9. It is required to write a parser for the grammar below. <source_file> ::= <declarations> <code> <declarations> ::= vars <list_of_variables> ; <list_of_variables> ::= <variable> | <list_of_variables> , <variable> <code> ::= <statements> . <statements> ::= <assignment> | <statements> ; <assignment> <assignment> ::= <variable> := <expression> <expression> ::= <expression> + <term> | <expression> - <term> | <term> <term> ::= <term> * <factor> | <term> / <factor> | <factor> <factor> ::= <number> | <variable>Using Java, a program that reads as input an arbitrary context-free grammar from a text file and then derives/enumerates five strings from the grammar. The file cfg.txt can be used to test your program. The grammar represented in cfg.txt is the following grammar for non-palindromes (from input alphabet {a,b}): S -> aSa | bSb | XX -> aYb | bYaY -> aY | bY | lambdaThis is formatted in cfg.txt as follows: S aSaS bSbS XX aYbX bYaY aYY bYY *An asterisk is used for lambda. Assume that the first state listed in the input file is the start state. Read the grammar into a map (aka hash or dictionary) where the key is a variable and the value is a list of right-hand sides. If you are using Java, you could use Hashtable by declaring a Hashtable of the following type:Hashtable<String, ArrayList<String>>Do not write the program specific to this grammar in cfg.txt. Further, assume that the test file will have more than three variables, and productions on the right hand side can…Computer Science Use the Python PLY library to write a parser for the following grammar. You may assume variables A, B, and C are either integers, float, or strings. To simplify your work, assume that these variables have the same data type (choose one: integer, float, string). <program> → begin <stmt_list> end<stmt_list> → <stmt> | <stmt> ; <stmt_list><stmt> → <var> = <expression><var> → A | B | C<expression> → <var> + <var> | <var> - <var> | <var> Do the code please