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MCQ

Which is the most powerful parser?

SLR

LALR

Canonical LR

Operator PrecedenceThe most powerful parser is Canonical LR

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Is similar to interpreter

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MCQ

Given the following expression grammar:

E -> E * F | F + E | F
F -> F - F | id

* has higher precedence than +

+ and

+ has higher precedence than *

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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                5.
                Compute E.value for the root of the parse tree for the expression:2 # 3 & 5 # 6 &4.
            

            
                                                            
                            
                            A
                            
                                200                            
                        
                                            
                            
                            B
                            
                                180                            
                        
                                            
                            
                            C
                            
                                160                            
                        
                                            
                            
                            D
                            
                                40                            
                        
                                                

            
                Correct Answer: C
                Higher precedence operator will never produce an expression with operator with lower precedence.&># in terms of precedence order.
            
        

        
            
            
                            
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