Question Discussion & Solution

MCQ

Consider the following two sets of LR (1) items of an LR (1) grammar.

X -> c.X, c/d
   X -> .cX, c/d
   X -> .d, c/d
   X -> c.X, $
   X -> .cX, $
   X -> .d, $

Which one is false?

1. Cannot be merged since look ahead



                        
                                                                                                
                                        
                                        
                                        
                                            A                                        
                                        
                                        
                                            1 only                                        
                                    
                                                                    
                                        
                                        
                                        
                                            B                                        
                                        
                                        
                                            2 only                                        
                                    
                                                                    
                                        
                                        
                                        
                                            C                                        
                                        
                                        
                                            1 and 4 only                                        
                                    
                                                                    
                                        
                                        
                                        
                                            D                                        
                                        
                                        
                                            1, 2, 3 and 4 only                                        
                                    
                                                                                    

                        
                            Correct Answer: D
                            All these are valid reasons.



            
                
                    
                    
                        
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                1.
                A bottom up parser generates __________
            

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

        
            
            
                            
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                2.
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                            B
                            
                                Interpreter                            
                        
                                            
                            
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                                Compiler or interpreter test                            
                        
                                            
                            
                            D
                            
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                Correct Answer: D
                No Logical errors can be detected.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                3.
                Consider the grammar defined by the following production rules:  S --> T * P 
    T --> U | T * U
    P --> Q + P | Q
    Q --> Id
    U --> Id
Which one of the following is TRUE?
            

            
                                                            
                            
                            A
                            
                                + is left associative, while ? is right associative                            
                        
                                            
                            
                            B
                            
                                + is right associative, while ? is left associative                            
                        
                                            
                            
                            C
                            
                                Both + and ? are right associative                            
                        
                                            
                            
                            D
                            
                                Both + and ? are left associative                            
                        
                                                

            
                Correct Answer: B
                It is associative we can see and tell.
Second productions latter part shows left recursion and is left associative.
            
        

        
            
            
                            
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                4.
                Pee Hole optimization __________
            

            
                                                            
                            
                            A
                            
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                            B
                            
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                            C
                            
                                Constant folding                            
                        
                                            
                            
                            D
                            
                                Data Flow analysis                            
                        
                                                

            
                Correct Answer: C
                More loops are added.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                5.
                A shift reduce parser carries out the actions specified within braces immediately after reducing with the corresponding rule of grammar S
            

            
                                                            
                            
                            A
                            
                                23131                            
                        
                                            
                            
                            B
                            
                                11233                            
                        
                                            
                            
                            C
                            
                                11231                            
                        
                                            
                            
                            D
                            
                                33211                            
                        
                                                

            
                Correct Answer: A
                Initially 2 is printed then 3 then 1 3 1.
            
        

        
            
            
                            
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