context free grammar for identifiers
S -> <start><Pattern>
start -> _|A-Z|a-z
pattern-><id><pattern>|ε
id -> _|A-Z|a-z|0-9
Context Free Grammar for the language of C++ identifiers consisting of uppercase and lowercase letters, digits,...
Write a C program that reads characters from a text file, and recognizes the identifiers in the text file. It ignores the rest of the characters. An identifier is a sequence of letters, digits, and underscore characters, where the first character is always a letter or an underscore character. Lower and upper case characters can be part of the identifier. The recognized identifier are copied into the output text. b. Change the C program in exercise 2, so that all...
Suppose that a five-letter password can consist of uppercase and lowercase letters. If such a password is generated at random, what is the probability it will consist of only uppercase letters?
3 points) Question Three Consider the context-free grammar S >SS+1 SS 1a and the string aa Give a leftmost derivation for the string. 3 points) (4 poiots) (5 points) (3 points) sECTION IWOLAttcmpt.any 3.(or 2) questions from this.scction Suppose we have two tokens: (1) the keyword if, and (2) id-entifiers, which are strings of letters other than if. Show the DFA for these tokens. Give a nightmost derivation for the string. Give a parse tree for the string i) Is...
Give a context-free-grammar describing the syntax of the
following language.
Thank you =)
Give a context-free-grammar describing the syntax of the following language: L = { ww| we{a, b }" } is a context- free language, where w is a non-empty string from alphabet {a, b } and wt denotes the reversal of string w.
1)Convert the following context free grammar to Chomsky Normal Form S → a X | Yb X → S | λ Y → b Y | λ 2)Some languages distinguish between uppercase and lowercase in identifiers. What are the pros and cons of this design decision? 3)Use the pumping lemma to prove that the following languages are not regular. (The alphabet is Σ = {a, b}.) a) L = {an b1 ak: k >= n+ l} b) L = {ww:...
Write a program that prompts for a sentence and calculates the number of uppercase letters, lowercase letters, digits, and punctuation. Output the results neatly formatted and labeled in columns. how I can make this program in a more simple way. # get user input user_string = input("Enter a sentence: ") # create and initialize variables upper_case = 0 lower_case = 0 digits = 0 spaces = 0 punctuations = 0 x = len(user_string) #loop conditions and increment for i in...
Find the context free Grammar for the following language L = {w ∈ {a, b, c}* : na (w) + nb (w) ≠ nc (w)}.
Write a context-free grammar that generates the same language as regular expression which is ab*|c+ (Describe the four components of context-free grammar which are start symbol(S), non-terminals(NT), terminals(T), and set of production rules(P))
Q1: Given the below language and context free gramma:, a. Show that the grammar is ambiguous using the string ( abc) by using substitutions. b. Then design a push down automata that recognizes the language. C. Then show the tracing of (abc, abbccc) using the push down automata. d. Then Show which two simple languages create the greaterlanguage. Give set builder notation for each language. e. Then produce Chomsky normal form for the grammar. The following context-free language is inherently...
Write a program that reads a line of text, changes each uppercase letter to lowercase, and places each letter both in a queue and onto a stack. The program should then verify whether the line of text is a palindrome (a set of letters or numbers that is the same whether read forward or backward). please use c++ language and use own queue class or class provided. plese do not use queue library. please use functions.