Generating CFG from regular expression | context free grammar | RE to CFG | CFG from RE | cfg to re
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- เผยแพร่เมื่อ 3 ต.ค. 2024
- Generating Context free grammar from any given regular expression is very important. So we will see multiple solved examples here that will help you in theory of computation as well as compiler design. In this video, we'll see the examples of how to generate CFG (Context Free Grammar) from the given regular expression in TOC (Theory of computation) #cfg #regularExpression #toc #cse #cseconceptwithparinita
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Dear mam you gave me confidence that i can clear my toc exam.the way you teach is more understandable than my proffessor tech us in lecture.❤
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God bless you, you explained way better than my professor, who I paid $10k
Happy to help😊
THANK YOU! Studying night before. best explanation on yt for CGF! Commenting for algorithm! thank you!!!!!!
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Mam, you are a great teacher, understood the whole concept clearly and tomorrow is my exam!!!
Glad to know that. Wish you all the best for your exam :)
@@CSEconceptswithParinita Thank you mam, it was great :)
THANK YOU SO MUCH! THANKS TO YOUR VIDEO I WAS ABLE TO DO AN EXERCISE I'VE BEEN TRYING SINCE YESTERDAY
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It is really one of the best explanations available online
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thank you very much. crystal clear concept. thanks once again. my online graded assignment is going on. thanks
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I believe this is also correct.
For the first problem:
S -> ASB|aa
A -> a|b|lambda
B -> a|b|lambda
For the second problem:
S -> ASB|1
A -> 0|lambda
B -> 0|1|lambda
Thanks. this is really a great tutorial. very easy and clear explanation
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Easy Explanation...Thank You.
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Very nice explanationn thanxxx alot
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what a thorough and lovely explanation! thanks.
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you made it so easy keep growing
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best explaination in youtube, thankyou so much mam :-)
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India might not have defeat Hitler, it may not have sent the first man to the Moon, but its great people did save millions of suffering Computer Science students :D
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We have other achievements but it's ok
Thank you mam 😊 nice explanation 👍
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Awesome explanation
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ooof you saved my ass this sem. 😀😂
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. a. Explain why some programming languages require automatic memory management (“garbage collection”) for program execution?
b. At a given point in the execution of a program, what can be considered as garbage? How can garbage be located in memory?
Thank you a lot for the overall idea !!
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Teacher you teach in a fabolous way
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Thanks ma'am. Very clear
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nice explanation mam,Thank you
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best explanation!
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@@CSEconceptswithParinita thank you so much for your help! you are a great teacher!
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Very clear explanation!
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great lecture👍
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Q2. Consider the following Context Free Grammar (CFG)
𝑆 → 𝐴𝑎 | 𝐵𝐴𝑏
𝐴 → 𝐵𝐵 | 𝑐
𝐵 → 𝑆𝑑 | 𝑒
where {a, b, c, d, e} is the set of terminal symbols.
a. Give a right-most derivation of ecadeb.
b. Give a left-most derivation of ecadeb.
c. Compute FIRST and FOLLOW for this grammar?
d. Discuss whether CFG is ambiguous or not and draw the parsing tree?
RE is this (a+b)* generate two CFGs ??
Kindly solve this
Thank you :D
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Thank you mam❤
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5:43 rip insect you will be missed
Good observation 😂😂
what is cfg for ab^naa^n?
hello mam
0(0+1)*01(0+1)*1
how can we solve this one
confused little bit
thank you
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But telegram we can't share our problem beczause its mute.
Share in whatsapp group / LinkedIn/ Facebook
Thanks mam
My pleasure 😊
Thnku mam ☺
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How about R = (b*ab*ab*)*b*
Nice🙂
Thank you 😊
Agar hame kuch poochna can we contact theough telegram or some where?
Through any of my social media handles
in case of 2nd example if we use B instead of A ..........
S=B1B
B=0B/1B/^
is this correct?
A heads up, in the first example in your language L you marked "bbbaa" as a part of the language while it isn't
This is because the (a+b)* group requires at least one letter "a" and exactly one "b" per repetition if the group exists; the CFG you have used would also recognize "baab" as a part of its language
That being said, the CFG that I would use here is
S -> AS | aaS | eps
A -> aA | ab | eps
This grammar should now NOT recognize "bbbaa" nor "baab" as a part of the language
If I'm wrong feel free to correct me; I'm still trying to learn how to properly translate regex into CFG which basically brought me to watch this video!
EDIT: Similar mistake happens in the second example
Because of B -> 1B grammar will accept 11111 as a part of its language
(a+b)* means 0 or more occurences of combination of a and b
(a+b)+ means 1 or more occurences of combination of a and b
so, the video is correct, you got confused, got it?
@@ChocoFeather nope... I even gave explanations why they don't work
(a+b)* indicates that if there's a "b" there MUST also be at least one "a" beforehand => "bbbaa" does not belong to the language L in the first example because it does NOT have at least one "a" before each "b", similar logic also applies to the example "baab" and the mistake repeats itself with (0+1)* once again
@@vekyyy so, 'bb' doesn't belong to the language of this regex: (a+b) ?
Or in (a+b)* ?
@@ChocoFeather indeed
(a+b)* => L = {ab, aab, aaab, abab, abaab ...}
However:
(a*b)* => L = {b, bb, ab, aab, bbaabbaaaabbbb, ...}
Mam how to find CFG for (0)*(1(0+1)*
Yeh log sirf easy question hi solve karte hai , who agree with me hit a like🙃
Kyuki ham ye sochke video banate hai ki jinko ye topic nahi aata, vo video dekhke ye topic seekh jaaye. And for that purpose, direct complicated example nahi le sakte as we have to think about a wider audience 🙃
Who
The ant on the book distracted me a lot.. :p
Apologies for that😂😂
@@CSEconceptswithParinita its fine i was just kidding.. and thank you for teaching the concepts.. tomorrow i have exam.. whis me luck. 😁.
Wish you all the best dear✌💯
@@CSEconceptswithParinita thank u thank u..
U r explaining too much which is disgusting... Otherwise its a praiseworthy explanation..
Thank you Somya for your opinion. Can you please elaborate what actually you didn't like?
Somya you sound brainless..
Free help given by someone who you don't even know..
Likely wants to help everyone succeed, how about you upload a video
so we can laugh at you incompetence? Or sit down and learn your place.
@@CSEconceptswithParinita The video is outstanding, really helped me after hours of searching.
Some people just aren't happy..lol
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