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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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### Replies to This Discussion

Our main purpose here discussion not just Solution

Abdul Waheed gud keep it up

Note @ All: You don’t need to go any other site for this assignment/GDB/Online Quiz solution, Because All discussed data of our members in this discussion are going from here to other sites. You can judge this at other sites yourself. So don’t waste your precious time with different links.

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

why are there blank transition in it?

Please anyone help us in this assignment.

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.

wo b handouts mein hi ha. :)

will some one share its solution??

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