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To learn and understand the concepts of LR(1) parsers, canonical collections and shift/reduce conflicts.



Lectures Covered: 22-30                                                     





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Question No 1:                                                                                                                          Marks 20


Consider the following context free grammar:


S  →  Sa

S  →  bS

S  →   c


(a) Write the canonical collections of LR(1) items for the given context free grammar:

[4 marks]


(b) Identify all conflicting items from solution of part a, and the types of the conflicts. [4 marks]


(c) Could the original grammar be converted into an LALR(1) parser that parses all input correctly by resolving conflicts, in the way that YACC and similar parser generators allow? If so, how should they be resolved? In either case, please explain briefly. [4 marks]


(d) Rewrite the grammar in an equivalent form that is suitable for LL parsing and minimizes the use of stack space. [4 marks]


(e) Rewrite the grammar in an equivalent form that is directly suitable for LR parsing (i.e., does not result in conflicts) and minimizes the use of stack space. [4 marks]



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Replies to This Discussion

Plz guid about solution

ksi ko b ni ata

koi to banai

ye subject q itna mushkil hai  

Thanks GOD ......   me done complete




anwar jaisooo ko ata jata kuch hota nai... aur shooky hoty rehty hai...

ja pai kam kar apna... kar li hai too announcement krva dy VU pay 

thanks dear on this compliment

agr mujy nhi ati to ap bana kar upload kar dy dekhty hn u kya ho .............. 




very good ... can you plz share?? 

to ni select krna tha phr :P

Marynoor q hum jo prh rhy is liay mushkil h

Anwar ul haq please share idea 


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