GATE | GATE CS 2019 | Question 13

Which one of the following kinds of derivation is used by LR parsers?
(A) Leftmost
(B) Leftmost in reverse
(C) Rightmost
(D) Rightmost in reverse

Answer: (D)

Explanation: Parsing is classified into two categories, i.e. Top Down Parsing and Bottom-Up Parsing. Top-Down Parsing is based on Left Most Derivation whereas Bottom Up Parsing is dependent on Reverse Right Most Derivation.

A general shift reduce parsing is LR parsing is bottom-up parsing where L stands for scanning the input from left to right and R stands for constructing a rightmost derivation in reverse.

So, option (D) is correct.

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