(a) Consider the following context free grammars (CFG): i. B> dBb | bBd | dCb C>aC|E ii. E>FG F> fgFg | fgGg |f G>g Do left factoring of the above grammars (if necessary). Why is it needed to do left factoring of a grammar? Explain with proper example. (b) Write down the regular expression and draw the transition diagram of how a lexical analyzer will detect all the positive or negative floating point numbers (eg. 1.5, 45, 2. , - 98. , - 6.71,-.39 etc.). 2.

Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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(a) Consider the following context free grammars (CFG):
i.
ii.
B> dBb | bBd | dCb
C>aC |E
E>FG
F> fgFg | fgGg |f
G→ g
Do left factoring of the above grammars (if necessary).
Why is it needed to do left factoring of a grammar? Explain with
proper example.
(b) Write down the regular expression and draw the transition
diagram of how a lexical analyzer will detect all the positive or
negative floating point numbers (eg. 1.5, 45, 2. , - 98. , – 6.71,- .39
etc.).
2.
Transcribed Image Text:(a) Consider the following context free grammars (CFG): i. ii. B> dBb | bBd | dCb C>aC |E E>FG F> fgFg | fgGg |f G→ g Do left factoring of the above grammars (if necessary). Why is it needed to do left factoring of a grammar? Explain with proper example. (b) Write down the regular expression and draw the transition diagram of how a lexical analyzer will detect all the positive or negative floating point numbers (eg. 1.5, 45, 2. , - 98. , – 6.71,- .39 etc.). 2.
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