Virtual Labs

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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

Conversion of RE to NFA

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Beginner

Intermediate

Advanced

Given the regular expression (a|b)*c, provide the corresponding NFA.

a: A simple NFA with states for 'a' and 'b'. Explanation

Explanation

b: An NFA recognizing zero or more occurrences of 'a' or 'b' followed by 'c'. Explanation

Explanation

c: An NFA recognizing 'a' or 'b' followed by zero or more occurrences of 'c'. Explanation

Explanation

d: An NFA recognizing 'ab' followed by 'c'. Explanation

Explanation

Explain the role of epsilon transitions in NFAs during the conversion of a regular expression to an NFA.

a: Epsilon transitions are not used in NFAs. Explanation

Explanation

b: Epsilon transitions allow the NFA to transition between states without consuming input. Explanation

Explanation

c: Epsilon transitions force the NFA to accept any input symbol. Explanation

Explanation

d: Epsilon transitions are only used in DFAs, not NFAs. Explanation

Explanation

What is the purpose of the Kleene star (*) in a regular expression and how does it affect the corresponding NFA?

a: The Kleene star represents alternation in a regular expression. Explanation

Explanation

b: The Kleene star denotes zero or more occurrences of the preceding element, and it results in loops in the NFA. Explanation

Explanation

c: The Kleene star represents the end of a regular expression. Explanation

Explanation

d: The Kleene star forces the NFA to recognize only a single occurrence of the preceding element. Explanation

Explanation

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