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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                2.
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                Correct Answer: B
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                Correct Answer: C
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S ? aA/a
A ? aA/?
In above grammar, string 
            
        

        
            
            
                            
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                Correct Answer: A
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