COMPUTER SCIENCE AND ENGINEERING
COMPILER DESIGN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Left to Right derivation
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Left to Right with Rightmost derivation
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Left to Right with Leftmost derivation
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None of the above
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Detailed explanation-1: -LR parsers are also known as LR(k) parsers, where L stands for left-to-right scanning of the input stream; R stands for the construction of right-most derivation in reverse, and k denotes the number of lookahead symbols to make decisions.
Detailed explanation-2: -An LR(0) parser is a type of bottom-up parser that uses a one-symbol lookahead to determine its next parsing action. The “L” stands for left-to-right scanning of the input, and the “R” stands for constructing a rightmost derivation in reverse order.
Detailed explanation-3: -Which one of the following kinds of derivation is used by LR parsers? 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.
Detailed explanation-4: -Explanation: LR stands for Left to right and rightmost derivation in reverse.
Detailed explanation-5: -Bottom-up parser:-A Bottom-up parser generates the Rightmost derivation in reverse. This corresponds to starting at the leaves of the parse tree also known as shift-reduce parsing. The strings that are reduced during the reverse of a rightmost derivation are called the handles.