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When the parser starts constructing the parse tree from the start symbol and then tries to transform the start symbol to the input, it is called?

bottom-up parsing

top-down parsing

Both A and B

None of the above

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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            
            
        

        
            
                2.
                Which of these is also known as look-head LR parser?
            

            
                                                            
                            
                            A
                            
                                SLR                            
                        
                                            
                            
                            B
                            
                                LR                            
                        
                                            
                            
                            C
                            
                                LLR                            
                        
                                            
                            
                            D
                            
                                None of the mentioned                            
                        
                                                

            
                Correct Answer: C
                LLR is the look ahead parser.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                3.
                When there is a reduce/reduce conflict?
            

            
                                                            
                            
                            A
                            
                                If a state does not know whether it will make a shift operation using the production rule i or j for a terminal                            
                        
                                            
                            
                            B
                            
                                If a state does not know whether it will make a shift or reduction operation using the production rule i or j for a terminal                            
                        
                                            
                            
                            C
                            
                                If a state does not know whether it will make a reduction operation using the production rule i or j for a terminal                            
                        
                                            
                            
                            D
                            
                                None of the mentioned                            
                        
                                                

            
                Correct Answer: C
                It occurs when If a state does not know whether it will make a reduction operation using the production rule i or j for a terminal.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                4.
                An LR-parser can detect a syntactic error as soon as __________
            

            
                                                            
                            
                            A
                            
                                The parsing starts                            
                        
                                            
                            
                            B
                            
                                It is possible to do so a left-to-right scan of the input                            
                        
                                            
                            
                            C
                            
                                It is possible to do so a right-to-left scan of the input                            
                        
                                            
                            
                            D
                            
                                Parsing ends                            
                        
                                                

            
                Correct Answer: B
                Error is found when it the input string is scanned.
            
        

        
            
            
                            
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                5.
                The optimization which avoids test at every iteration is?
            

            
                                                            
                            
                            A
                            
                                Loop unrolling                            
                        
                                            
                            
                            B
                            
                                Loop jamming                            
                        
                                            
                            
                            C
                            
                                Constant folding                            
                        
                                            
                            
                            D
                            
                                None of the mentioned                            
                        
                                                

            
                Correct Answer: A
                Execution speed is enhanced by sacrificing bits.
            
        

        
            
            
                            
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