We are here with you hands in hands to facilitate your learning & don't appreciate the idea of copying or replicating solutions. Read More>>

Looking For Something at vustudents.ning.com? Click Here to Search

www.bit.ly/vucodes

+ Link For Assignments, GDBs & Online Quizzes Solution

www.bit.ly/papersvu

+ Link For Past Papers, Solved MCQs, Short Notes & More


Dear Students! Share your Assignments / GDBs / Quizzes files as you receive in your LMS, So it can be discussed/solved timely. Add Discussion

How to Add New Discussion in Study Group ? Step By Step Guide Click Here.

Assignment No. 02
Semester: Fall 2014
Compiler Construction CS606

 

Total Marks: 20

 

Due Date: 08/12/2014

 

Objective:

 

To learn and understand basic concepts of Parse Trees, Top Down Parsers, Predictive

Parsing, First and Follow Sets in building a Lexical analyzer.

Instructions:

It should be clear that your assignment will not get any credit (zero marks will be awarded) if:

 

  • The assignment is submitted after due date.
  • The submitted assignment does not open or file corrupt.
  • The assignment is copied (from other student or copy from handouts or internet).
  • Student name and ID are not mentioned in the assignment file.
  • It is in some format other than .doc or .docx(MS Word Document).

For any query about the assignment, contact at cs606@vu.edu.pk

Question No 1:                                                                                                                       Marks 10

Consider the following grammar; you are required to write left most derivation of the string “aebb”.

           

Question No 2:                                                                                                                        Marks 10             

Consider the following grammar for arithmetic expressions:

 

A à id X

X àA Y |ε

Y à- X | + X | / X | * X

 

Show the first set for the non-terminals X and Y in the grammar.

 

BEST OF LUCK

 

+ How to Follow the New Added Discussions at Your Mail Address?

+ How to Join Subject Study Groups & Get Helping Material?

+ How to become Top Reputation, Angels, Intellectual, Featured Members & Moderators?

+ VU Students Reserves The Right to Delete Your Profile, If?


See Your Saved Posts Timeline

Views: 1742

.

+ http://bit.ly/vucodes (Link for Assignments, GDBs & Online Quizzes Solution)

+ http://bit.ly/papersvu (Link for Past Papers, Solved MCQs, Short Notes & More)

+ Click Here to Search (Looking For something at vustudents.ning.com?)

+ Click Here To Join (Our facebook study Group)

Replies to This Discussion

Ik qareeb tareen example:

Question:

S → ABC | BC
A → aA | a
B → b | ε
C → c | d | ε

Answer:
first(A) = first(aA) ∪ first(a)
= {a} ∪ {a}
= {a}
first(B) = first(b) ∪ first(ǫ)
= {b} ∪ ∅
= {b}
first(C) = first(c) ∪ first(d) ∪ first(ǫ)
= {c} ∪ {d} ∪ ∅
= {c, d}
first(S) = first(ABC) ∪ first(BC)
= (first(A) ∪ ∅) ∪ (first(B) ∪ first(C) ∪ ∅)
= {a} ∪ {b} ∪ {c, d}
= {a, b, c, d}

plz anybody upload answer of 2nd Question ... 

T = { number, id, +, -} 

yh chyzain terminal main ay gi

bs is kyHisab Sy bana daain 

InshaAllah marks mily gain:P 

 Reply by مَلیکا ایمان 4 minutes ago

then iska First just {a,b} hona chahiaye na k  {a,b,c,d,e}.. 




Malika Api 

a,b tu hn pr Agy 2nd main dekho A hy nonterminal us ky andr phr XYZ hn

Nonterminal tu isly wOo c,d,e aarahy hain samj aa gi hu gi ab

 Capital Letters are Non Terminal, However, small and symbols are Terminal

So here, A, Y,X are Nonterminal and +,-,*,/ are the Terminal..

it means, 

Answer 'll be;

First(X)={,ε}

First(Y)={-,+,/,*}

right??

ys nic approach,

bt id iz also terminal. :) 

Second qustion,

acording to Lec 18,

first of al v hav to write terminals,

which r +, -, / , id

Then use nonterminals by using algorithm

For using algo, we hav to start with FIRST(A) whch is equal to idX

then choose right most nonterminal wch is X then use this n find the nonterminals of X wch is AY now take frst alphabet n see alphabtes of A if there is no any Epsilon then stop here. 

Go nxt n use this algo again till u find Epsilon.

forexampl;

FIRST(A) = FIRST(A) - epsilon.

i got 18 marks

*******************

mistake was id is missing from first X.

same mistake ..

hmm good appi

api id bi ana tha wo bi terminal main hi ana tha 

mri tu yh book clr A hy .

 welcome  

Congrats 

RSS

© 2020   Created by +M.Tariq Malik.   Powered by

Promote Us  |  Report an Issue  |  Privacy Policy  |  Terms of Service

.