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q12-grammar

# q12-grammar - Consider the ±ve state machine de±ned by...

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CSE 260 QUIZ-12– Grammars and FAs- ANSWERS (20 minutes) NAME: 1. (15 points) Consider the following grammar G = ( V, T, S, P ), where V = { S, a, b } , T = { a, b } and the set of productions P consists of S aS S b (a) Give a derivation for the word aab. S aS aaS aab (b) Give the derivation (parse) tree for the above word. S a S S a b (c) Give the language generated by the above grammar. In set notaion: { a i b | i = 0 , 1 , 2 , ... } Regular expression: a * b 2. (20 points) Let V = { S, A, B, a, b } and T = { a, b } . Find the language generated by the grammar ( V, T, S, P ) when the set of productions P consists of (a) S AB, A ab, B bb { abbb } (b) S AA, S b, A aaA, A aa L = { b, a 2 i +4 | i = 0 , 1 , 2 , ... } 3. (20 points) This exercise covers finite state machines with output. Consider the five

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Unformatted text preview: Consider the ±ve state machine de±ned by the table below. The start state is s . f g input input state 0 1 0 1 s s 1 s 1 0 s 1 s 1 s 2 1 1 s 2 s s 4 0 0 s 3 s 2 s 0 0 s 4 s 3 s 4 0 0 (a) Draw the state diagram (graph) representing this machine. s0 s1 s2 s3 s4 0/0 1/0 0/0 1/0 0/0 1/1 0/1 1/0 0/1 1/0 (b) What is the output string generated when the input string is 001101? 111000 (c) What is the sequence of states through which the machine passes when the input string is 001101? s s 1 s 1 s 2 s 4 s 3 s (d) What is the output string generated when the input string is 1101? 0011...
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