Draw a DFA that recognizes the words {if, then, else}.
Show that the following language is decidable. L={〈A〉 | A is a DFA that recognizes Σ∗ } M =“On input 〈A〉 where A is a DFA:
Create both an NFA and DFA that recognizes the language {w | w has an even length}
Modify the code (that recognizes words ending with ing) to a code that recognizes the keywords if, then and else. In case it recognizes if it should output KEYWORD_IF,… If the word is not recognized, it should return an ERROR message. Scanner scan = new Scanner(System.in); String s = scan.next(); int q = 0; for (char c : s.toCharArray()) { switch (q) { case 0: q = (c=='i')? 1 : 0; break; case 1: q = (c=='n')? 2 : ((c=='i')?...
Construct an DFA automaton that recognizes the following language of strings over the alphabet {a,b}: the set of all strings over alphabet {a,b} that contain aa, but do not contain aba.
Build the DFA that recognizes the LR(0) sets of items for the grammar Goal -> B B -> id P | id ( E ] P -> ( E ) | ? E -> B | B , E
Let M be a DFA that recognizes a finite language A, and suppose M has n states. Determine if the following statement is true or false: if w Element of A, then |w| < = n. Prove your answer.
(10pts)Use the subset construction to build a DFA that recognizes the language recognized by the following NFA. Clearly show your steps so that it is clear that you used the subset construction. 2 90
1. Construct a DFA that recognizes each of the following languages: a. L1 = {w € {a, b}* | w contains at least two a's and at least two b’s} b. L2 = {w € {a,b}* | w does not contain the substring abba} C. L3 = {w € {a, b}* | the length of w is a multiple of 4}
Draw a dfa for a given language For Σ={a,b), draw a dfa that accepts the language. Clearly mark your start and final states. We were unable to transcribe this image
1.A: Let Sigma be {a,b}. Draw a DFA that will accept the set of all strings x in which the last letter of x occurs exactly twice in a row. That is, this DFA should accept bbabbbaa (because there are two a's at the end), and aaabb (two b's), but should not accept aaa (3 a's in a row, and 3 is not exactly 2), nor single letter words such as 'b', nor baba, etc.