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Lexical Analysis DFA 101 Quiz

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Questions and Answers

In a deterministic finite automaton (DFA), how many start states can there be?

Two or more start states

No specific restriction on the number of start states

At least two start states

Exactly one start state (correct)

What is the minimum number of final states required in a DFA?

At least three final states

At least one final state (correct)

Exactly two final states

No specific restriction on the number of final states

What happens if a character is encountered for which no transition is defined in the current state of a DFA?

The DFA remains in the current state

The DFA rejects the input string (correct)

The DFA accepts the input string

The DFA transitions to the start state

What is the defining characteristic of a deterministic finite automaton (DFA) in terms of the number of start states?

It has exactly one start state Signup and view all the answers

What is the significance of the transitions in a deterministic finite automaton (DFA)?

Transitions determine how the automaton switches between states given an input symbol Signup and view all the answers

How many final states can a deterministic finite automaton (DFA) have?

It can have multiple final states Signup and view all the answers

What is the purpose of using parentheses in constructing a compound regular expression?

To group subexpressions and avoid ambiguity Signup and view all the answers

What is a base case for a regular expression (RE)?

The empty string (i.e., 'ε') Signup and view all the answers

In the context of regular expressions, what does the Kleene star (*) represent?

Zero or more occurrences of the preceding regular expression Signup and view all the answers

Which construction is used to denote alternation between two regular expressions in a compound RE?

Optional repetition Signup and view all the answers