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Assignment No. 01
Fall 2017
Theory of Automata – CS402


Total Marks: 15


Due Date: 6/11/2017



Objective of this assignment is to assess the understanding of students about the concept of languages, regular expressions and finite automata.



Please read the following instructions carefully before submitting assignment:

  1. You should consult the recommended books, PowerPoint slides and audio lectures to clarify your concepts.
  2. You are supposed to submit your assignment in .doc format. Any other formats like scan images, PDF, zip, rar and bmp etc will not be accepted.
  3. It should be clear that your assignment will not get any credit if:
  • The assignment is submitted after due date.
  • The assignment is copied from Internet or from any other student.
  • The submitted assignment does not open or file is corrupt.


Note: No assignment will be accepted after the due date through email in any case (load shedding, server down, internet malfunctioning etc.).

It is recommended to upload solution file at least two days before its closing date.


For any query about the assignment, contact at


















Question No 1:                                                                                                                 Marks:5+5=10

Construct a regular expression defining each of the following languages over the alphabet ∑={a       b}:

a)      All words without the pattern ‘bb’ in them.

b)      All words that ends with a or bbbb


Question No 2:                                                                                                                           Marks=5

Build an FA that accepts the language of all words over the alphabet ∑= {a    b} that have exactly two a’s.



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Replies to This Discussion

IS KA Solution chahy

idea solution attached 


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kha jaa rhaa yeh b saii ha ... :P :P 


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