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MCQ

Consider the following grammar G.

 S ? F ? H
  F ? p ? c
  H ? d ? c

Which one is true?S1: All strings generated by G can be parsed with help of LL (1).
S2: All strings generated by G can be parsed with help of LR (1).

Only S1

Only S2

Both S1 & S2

None of the mentioned

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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.
                YACC builds up __________
            

            
                                                            
                            
                            A
                            
                                SLR parsing table                            
                        
                                            
                            
                            B
                            
                                Canonical LR parsing table                            
                        
                                            
                            
                            C
                            
                                LALR parsing table                            
                        
                                            
                            
                            D
                            
                                None of the mentioned                            
                        
                                                

            
                Correct Answer: C
                It is a parser generator.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                3.
                LR parsers are attractive because _________
            

            
                                                            
                            
                            A
                            
                                It can be constructed to recognize CFG corresponding to almost all programming constructs                            
                        
                                            
                            
                            B
                            
                                It does not backtrack                            
                        
                                            
                            
                            C
                            
                                It can be constructed to recognize CFG corresponding to almost all programming constructs & It does not backtrack                            
                        
                                            
                            
                            D
                            
                                None of the mentioned                            
                        
                                                

            
                Correct Answer: C
                These above mentioned are the reasons why LR parser is considered to be attractive
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                4.
                Match the following.
P. Regular expression        1. Syntax analysis
Q. Pushdown automata         2. Code generation
R. Dataflow analysis         3. Lexical analysis
S. Register allocation       4. Code optimization
            

            
                                                            
                            
                            A
                            
                                P-4. Q-1, R-2, S-3                            
                        
                                            
                            
                            B
                            
                                P-3, Q-1, R-4, S-2                            
                        
                                            
                            
                            C
                            
                                P-3, Q-4, R-1, S-2                            
                        
                                            
                            
                            D
                            
                                P-2, Q-1, R-4, S-3                            
                        
                                                

            
                Correct Answer: B
                Syntax analysis has Regular expressions. The code optimization goes hand in hand with data flow analysis. Whereas CFG is related to PDA which is related to syntax analysis Register allocation is used in reference with code generation.
            
        

        
            
            
                            
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                5.
                Which of the following is a phase of a compilation process?
            

            
                                                            
                            
                            A
                            
                                Lexical Analysis                            
                        
                                            
                            
                            B
                            
                                Code Generation                            
                        
                                            
                            
                            C
                            
                                Lexical Analysis & Code Generation                            
                        
                                            
                            
                            D
                            
                                None of the mentioned                            
                        
                                                

            
                Correct Answer: C
                Lexical analysis and code generation is a phase of compilation process.
            
        

        
            
            
                            
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