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Which of the following suffices to convert an arbitrary CFG to an LL(1) grammar?

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Which of the following suffices to convert an arbitrary CFG to an LL(1) grammar?

(a) Removing left recursion only

(b) Factoring the grammar alone

(c) Factoring & left recursion removal

(d) None of the mentioned

The question was posed to me in an online quiz.

This intriguing question originated from Top-Down Parsing in section Topdown Parsing of Compiler

1 Answer

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Right option is (d) None of the mentioned

The explanation: Factoring as well as left recursion removal do not suffice to convert an arbitrary CFG to LL(1) grammar.

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