Which of the following describes a handle (as applicable to LR-parsing) appropriately?a)It is the position in a sentential form where the next shift or reduce operation will occurb)It is non-terminal whose production will be used for reduction in the next stepc)It is a production that may be used for reduction in a future step along with a position in the sentential form where the next shift or reduce operation will occurd)It is the production p that will be used for reduction in the next step along with a position in the sentential form where the right hand side of the production may be foundCorrect answer is option 'D'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

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Which of the following describes a handle (as applicable to LR-parsing) appropriately?

a)
It is the position in a sentential form where the next shift or reduce operation will occur
b)
It is non-terminal whose production will be used for reduction in the next step
c)
It is a production that may be used for reduction in a future step along with a position in the sentential form where the next shift or reduce operation will occur
d)
It is the production p that will be used for reduction in the next step along with a position in the sentential form where the right hand side of the production may be found

Correct answer is option 'D'. Can you explain this answer?

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Which of the following describes a handle (as applicable to LR-parsing...

Let's first understand the terminology used here. LR Parsing - Here 'L' stands for Left to Right screening of input string, and 'R' stands for Right Most Derivation in Reverse (because it is about bottom-up parsing). Sentential Form - Suppose For a given Context Free Grammar G, we have a start symbol S, then to define Language generated by Grammar G, i.e. L(G), we start the derivation starting from S using the production rules of the grammar. After one complete derivation we get a string w which consists of only terminal symbols, i.e. w belongs to L(G). Then we can say that w is a sentence of the Grammar G. Now, while the derivation process, if it gets some form q, where q may contain some Non-terminal then we say that q is a sentential form of the Grammar G. Even the start symbol S is also the sentential form of the Grammar G (because it also contains Non-terminal S).

For Ex :
Grammar is :
S-> aAcBe
A->Ab|b
B->d
Input string : abbcde

Derivation : (Top-Down, Right Most Derivation)
S->aAcBe
->aAcde
->aAbcde
->abbcde

Here {abbcde} is the sentence of the Grammar(because it contains only terminal symbols), and {S, aAcBe, aAcde, aAbcde} are the sentential forms of the G (because these forms contain non-terminals during the derivation process) Now, let's look at the question. The question is related to LR parsing which is a bottom-up parsing. Let's take the same grammar above, as it is a bottom up parsing we need to start from the string "abbcde" and try to get S using production rules.

: abbcde
->aAbcde (using A-> b)
->aAcde (using A-> Ab)
->aAcBe (using B -> d)
->S (using S-> aAcBe)

The above process is called reduction. The RHS of the Production which is being replaced by their LHS is called Handle, So , { b, Ab, d, aAcBe} are handles, and replacing it with its LHS is called Handle-Pruning. Hence option D suits best.

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Which of the following describes a handle (as applicable to LR-parsing) appropriately?a)It is the position in a sentential form where the next shift or reduce operation will occurb)It is non-terminal whose production will be used for reduction in the next stepc)It is a production that may be used for reduction in a future step along with a position in the sentential form where the next shift or reduce operation will occurd)It is the production p that will be used for reduction in the next step along with a position in the sentential form where the right hand side of the production may be foundCorrect answer is option 'D'. Can you explain this answer?

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Which of the following describes a handle (as applicable to LR-parsing) appropriately?a)It is the position in a sentential form where the next shift or reduce operation will occurb)It is non-terminal whose production will be used for reduction in the next stepc)It is a production that may be used for reduction in a future step along with a position in the sentential form where the next shift or reduce operation will occurd)It is the production p that will be used for reduction in the next step along with a position in the sentential form where the right hand side of the production may be foundCorrect answer is option 'D'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Which of the following describes a handle (as applicable to LR-parsing) appropriately?a)It is the position in a sentential form where the next shift or reduce operation will occurb)It is non-terminal whose production will be used for reduction in the next stepc)It is a production that may be used for reduction in a future step along with a position in the sentential form where the next shift or reduce operation will occurd)It is the production p that will be used for reduction in the next step along with a position in the sentential form where the right hand side of the production may be foundCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following describes a handle (as applicable to LR-parsing) appropriately?a)It is the position in a sentential form where the next shift or reduce operation will occurb)It is non-terminal whose production will be used for reduction in the next stepc)It is a production that may be used for reduction in a future step along with a position in the sentential form where the next shift or reduce operation will occurd)It is the production p that will be used for reduction in the next step along with a position in the sentential form where the right hand side of the production may be foundCorrect answer is option 'D'. Can you explain this answer?.

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