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# CS606 Compiler Construction Assignment No 1 Solution & Discussion Due Date:13-11-2012

Question No 1: Marks 10
Let CFG be G = (Vn, Vt, S, P) where Vn = {<goal>, <expression>, <term>, <factor>}, Vt = {1, 2,
3, x, y, z, -, +}, S = <goal> and Productions(P) are;
<goal> <expression>
<expression> <term> / <expression> + <term>
<term> <factor> / <term> - <factor>
<factor> 1 / 2 / 3 / x / y / z
Considering the above productions of a CFG, you are required to do the following tasks:
a. Derive the expression “x + 2 - y”. [5 Marks]
b. Construct a parse tree for the expression “x + 2 - y”. [5 Marks]

Question No 2: Marks 10
Construct Nondeterministic finite automata (NFA) for regular expression (a | b)* using
Thompson’s Construction Algorithm. Show the sequence of moves made by each in processing
the input string “ababbab”.

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Please Discuss here about this assignment.Thanks

Our main purpose here discussion not just Solution

Abdul Waheed gud keep it up

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how will u accept the string "ab" through this RE.?

why are there blank transition in it?

Please anyone help us in this assignment.

answers are there in handouts.

plz tel where are answers in handouts

handouts main nae hain

For Question no.1 part b, Please go through the handouts. Lecture Number 12.

what about other?

wo b handouts mein hi ha. :)

will some one share its solution??

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