In some programming languages, an identifier is permitted to be a letter…

2017

In some programming languages, an identifier is permitted to be a letter followed by any number of letters or digits. If L and D denotes the set of letters and digit respectively. Which of the following expression defines an identifier?

Answer: C. L(L + D) * — An identifier must start with a letter (L). Following this, it can contain any number of letters or digits ((L + D)*). Therefore, the regular expression…

  1. A.

    (L + D) *

  2. B.

    (L.D) *

  3. C.

    L(L + D) *

  4. D.

    L(L.D) *

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Correct answer: C

An identifier must start with a letter (L). Following this, it can contain any number of letters or digits ((L + D)*). Therefore, the regular expression defining an identifier is L(L + D)*.

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