Can we convert regular expressions into finite automata?
Table of Contents
- 1 Can we convert regular expressions into finite automata?
- 2 What are the rules required to implement deterministic finite automata?
- 3 What is the difference between a deterministic and nondeterministic finite automaton?
- 4 Which of the following is useful for converting a finite automaton into a regular expression?
- 5 How do you create a non deterministic finite automata?
- 6 What is a deterministic state machine?
- 7 Can we convert DFA to NFA?
- 8 Is NFA more powerful than DFA?
Can we convert regular expressions into finite automata?
To convert the regular expression (RE) to Finite Automata (FA), we can use the Subset method. Subset method is used to obtain FA from the given RE. Step 1 − Construct a Transition diagram for a given RE by using Non-deterministic finite automata (NFA) with ε moves. Step 2 − Convert NFA with ε to NFA without ε.
What are the rules required to implement deterministic finite automata?
In DFA, there is only one path for specific input from the current state to the next state. DFA does not accept the null move, i.e., the DFA cannot change state without any input character. DFA can contain multiple final states. It is used in Lexical Analysis in Compiler.
Are finite state machines deterministic?
An FSM is defined by a list of its states, its initial state, and the inputs that trigger each transition. Finite-state machines are of two types—deterministic finite-state machines and non-deterministic finite-state machines.
What is the difference between a deterministic and nondeterministic finite automaton?
DFA can be understood as one machine. NFA can be understood as multiple little machines computing at the same time. In DFA, the next possible state is distinctly set. In NFA, each pair of state and input symbol can have many possible next states.
Which of the following is useful for converting a finite automaton into a regular expression?
Explanation: Thompson construction algorithm is an algorithm in automata theory used to convert a given regular expression into NFA. Similarly, Kleene algorithm is used to convert a finite automaton to a regular expression.
How will you construct a non deterministic finite automata from a regular expression?
Step 1 Construct an NFA with Null moves from the given regular expression. Step 2 Remove Null transition from the NFA and convert it into its equivalent DFA. If you want to convert it into a DFA, simply apply the method of converting NDFA to DFA discussed in Chapter 1.
How do you create a non deterministic finite automata?
As it has finite number of states, the machine is called Non-deterministic Finite Machine or Non-deterministic Finite Automaton….DFA vs NDFA.
| DFA | NDFA |
|---|---|
| A string is accepted by a DFA, if it transits to a final state. | A string is accepted by a NDFA, if at least one of all possible transitions ends in a final state. |
What is a deterministic state machine?
(definition) Definition: A finite state machine with at most one transition for each symbol and state. Also known as DFA, deterministic finite automaton.
What are the basic limitations of finite state machine?
Discussion Forum
| Que. | Basic limitations of finite state machine is |
|---|---|
| b. | It cannot remember state transitions |
| c. | It cannot remember grammar for a language |
| d. | It cannot remember language generated from a grammar |
| Answer:It cannot remember state transitions |
Can we convert DFA to NFA?
Yes, every DFA can be converted (and actually trivially is) an NFA.
Is NFA more powerful than DFA?
A DFA is just a special case of an NFA that happens not to have any null transitions or multiple transitions on the same symbol. So DFAs are not more powerful than NFAs. For any NFA, we can construct an equivalent DFA (see below). So NFAs are not more powerful than DFAs.