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Which is the most powerful parser?

SLR

LALR

Canonical LR

Operator Precedence

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MCQ

Which of the following is incorrect for the actions of A LR-Parser I) shift s ii) reduce A->

Only I)

I) and ii)

I), ii) and iii)

I), ii) , iii) and iv)

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MCQ

Find the TRUE statement?

I.  There exist parsing algorithms for some programming languages which has O(3) complexity.
II.  A programming language which allows recursion can be implemented with static storage allocation.
III. No L-attributed definition can be evaluated in The framework of bottom-up parsing.
IV. Code improving transformations can be performed at both intermediate code level and source Language.

I and II

I and IV

III and IV

I III and IV

Discussion

MCQ

Consider the grammar.

E ? E + n | E



            
                                                            
                            
                            A
                            
                                n, E + n and E + n                             
                        
                                            
                            
                            B
                            
                                n, E + n and E + n                             
                        
                                            
                            
                            C
                            
                                n, n + n and n + n                             
                        
                                            
                            
                            D
                            
                                n, E + n and E                             
                        
                                                

            
                Correct Answer: D
                E ? E + n {Applying E ? E + n }
? E + E * n {Applying E ? E * n }
? E + n * n {Applying E ? n }
? n + n * n {Applying E ? n }.



        
            
            
                            
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                MCQ            
            
        

        
            
                4.
                Which of the following derivations does a top-down parser use while parsing an input string?
            

            
                                                            
                            
                            A
                            
                                Leftmost derivation                            
                        
                                            
                            
                            B
                            
                                Leftmost derivation in reverse                            
                        
                                            
                            
                            C
                            
                                Rightmost derivation                            
                        
                                            
                            
                            D
                            
                                Rightmost derivation in reverse                            
                        
                                                

            
                Correct Answer: A
                In top down parser takes input from Left to right constructing leftmost derivation of the sentence.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                5.
                A bottom up parser generates __________
            

            
                                                            
                            
                            A
                            
                                Right most derivation                            
                        
                                            
                            
                            B
                            
                                Rightmost derivation in reverse                            
                        
                                            
                            
                            C
                            
                                Leftmost derivation                            
                        
                                            
                            
                            D
                            
                                Leftmost derivation in reverse                            
                        
                                                

            
                Correct Answer: B
                This corresponds to starting at the leaves of the parse tree also known as shift-reduce parsing.
            
        

        
            
            
                            
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