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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            
            
        

        
            
                1.
                Given the following expression grammar:E -> E * F | F+E | F
F -> F-F | id
which of the following is true?
            

            
                                                            
                            
                            A
                            
                                * has higher precedence than +                            
                        
                                            
                            
                            C
                            
                                + and                             
                        
                                            
                            
                            D
                            
                                + has higher precedence than *                            
                        
                                                

            
                Correct Answer: B
                Precedence is that a higher precedence operator will never produce an expression with operator with lower precedence.
In the given grammar MINUS has higher precedence than ASTERIX.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                2.
                Match the following.   List-I                  List-II
A. Lexical analysis       1. Graph coloring
B. Parsing                2. DFA minimization
C. Register allocation    3. Post-order traversal
D. Expression evaluation  4. Production tree
 
            

            
                                                            
                            
                            A
                            
                                A                             
                        
                                            
                            
                            B
                            
                                A                             
                        
                                            
                            
                            C
                            
                                A                             
                        
                                            
                            
                            D
                            
                                A                             
                        
                                                

            
                Correct Answer: C
                The entire column an items matches the Column B items in a certain way.
            
        

        
            
            
                            
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                MCQ            
            
        

        
            
                3.
                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            
            
        

        
            
                4.
                Which one of the following is true at any valid state in shift-reduce parsing?
            

            
                                                            
                            
                            A
                            
                                At the bottom we find the prefixes                            
                        
                                            
                            
                            B
                            
                                None of the mentioned                            
                        
                                            
                            
                            C
                            
                                Stack contains only viable prefixes                            
                        
                                            
                            
                            D
                            
                                Stack consists of viable prefixes                            
                        
                                                

            
                Correct Answer: C
                The prefixes on the stack of a shift-reduce parser are called viable prefixes.
            
        

        
            
            
                            
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                5.
                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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