Lec-5: Find First() in Compiler Design | First() & Follow() | Compiler Design

[@STTPwithRajani]

Sir u are doing great job in free of cost for students...u have not joined unacadmy...i am sure they hv approached u 100%... Thanks for being there for students who really want to learn cs...thanks again🙏

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100% agreed

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So true

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Sigma male

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Agree

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good

[@kanakyadav2498]

So, finally i got a one stop solution of my compiler design examination. Firstly, due to this pandemic, neither we could avail the books nor there were proper video lectures available on youtube to help me out in this subject. One of my friend suggested me this channel and surprisingly, watching the first video of this video series, made me realize that its going to be enough for my complete subject. The way this teacher has explained the concepts, his clear understanding as well as the clear vocalization of the subject had a huge impact. No doubt, this is the best of the series, i have ever watched in terms of Engineering subjects. No words to express my gratitude. Students like me who love to reach in depth of a subject, you have given a one stop solution. I cannot stop ravishing and thanking you "SIR"🤩. God bless😇

[@puranjanprithu6337]

u a blogger?

[@SDS0598]

sir, last example me F->id l (E jo hai usme F ka first i,( hona chaiye na , as id terminals hai toh unke first wale ka hona chahiye na... actually i had doubt there, please if you could explain shortly here only...please sir

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Hi

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[@mayankkumar6628]

Hail the lord 🙏 bow down to the king

[@1511kanika]

No one has explained in such Lucid manner.. grateful to you Sir

[@viral_editz_]

Right

[@pragmatic_p8]

I was confused on FIRST(x) for 1-2hrs....but,I understood this concept within a minute after watching your video..thanks sir!!

[@dipayanbhattacharjee8935]

Sir I love you. This subject made me cry, kept me up all night, and after watchin your videos i feel so dumb to not understand all these in the first place and cry over it. You are the best!!!!

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Legends are getting back in all semesters❤

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1:30 hour before exam

[@YashBhamare524]

@@NiharikaKohli12 😂All the best for your exam

[@NiharikaKohli12]

@@YashBhamare524 thank you thank you 🤣

[@akshaykumars9819]

in the last example you took id as the first(), but the first() should always be single terminal, so why cant it be just i ?

[@VinodKumar-dw7fg]

So you find the ans ?

[@aanchalsahu1414]

yes same question i have

[@harshitkhashoo6600]

id is abbreviation of identifier, which can be any variable name, like x or y or myVar

[@swarnavasamanta2628]

id is together. So it means it's a single terminal symbol and not two separate terminal symbols i and d. It means indentifier.

[@swarnavasamanta2628]

id is not same as for example a b c. Where abc are three different terminals not same as abc.

[@codingskills853]

Amezing lecture 🔥🔥. I can't explain that how much am I happy...that you are teacher of cse branch.. you are god for cse students..Thank u so much sir 🙏🙏🙏 u are best teacher in the world ❤️❤️.you are doing great job 👍👍...

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[@tanvirbadsha1629]

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[@DCSAamirSuhail]

Providing such high level knowledge for free.... Great work sir 👏👏👏

[@deepakmahajan4245]

Always first like the video then start watching...Respect and believe for sir👏👏🙏

[@SadiaAfroz.]

Sir you are great , same things my teacher says in very complicate way but you say it in a simple way .Love from Bangladesh sir ❤❤❤

[@chirntn]

in the last example, first(F) -> first(id) -> id , how? isn't id terminal so the first (id) should have been i ; Is there any special exception or something for id ?

[@chirntn]

Got it - so basically In the context of compiler design and formal grammars, id represents a terminal symbol that stands for an identifier token in the programming language being parsed. In the grammar you provided, the terminal symbol id represents the token for an identifier, which can be any sequence of letters, digits, and underscores that follows the rules of the programming language's naming conventions. Therefore, the FIRST set of id is simply id itself, as it is the only possible token that can start with the id terminal symbol. To clarify, i is a character in the English alphabet, while id is a token in the programming language's syntax. The symbol id is used in the grammar to represent the terminal symbol that matches an identifier token in the language, and it has nothing to do with the character i.

[@tufts4810]

just a quick question can you tell me why in the fourth question FIRST(F) id is taken? shouldn't we take i as both i and d are terminals?

[@abhisheklayek4872]

Thank you sir for explaining each and every parts of compiler design in such a simple way.. ♥

[@shettysakshi7368]

The way u teach is on point no timepass straight to the point ..🙌🙌✨

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Tomorrow is my exam and never attended a single class of CD. And now learning from this playlist.

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same here as of now

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You are great sir aapke samjhane ka tarika sabse easy hai kash aap jese sir sare university me hote 🤗

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Sir, A job well done 👍 kudos to you! Have my exam in literally few hrs & you’ll be the one making it happen

[@mah6757]

Sir, your method of teaching is extraordinary and outstanding. Sir these videos help me in Bsc preparation and i stood first in college then 5th semester of Bscs i stood also first. Thank you so much Sir Love you from IUB.

[@agnisikhamallick8047]

Sir in this video S--> abc|def|ghi (and these are terminals) first of S is a,d,g Then in this question F-->id|(€ (here id is also terminal) Then how can the first of F will be id,( ? It should be i,( ? Sir, please answer 🙏

[@ShivamPandey-ls6po]

Same doubt

[@darkuswrath1350]

id is a terminal itself, you should have started with lexical analysis first.

[@rahulkaushik8897]

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[@furzi1432]

In the last question why the first of f is {id,(} why its not only {i,(} ? Can anyone explain pls 🙏🙏

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Thanks sir aap free of cost computer engineering ka almost Sara content provide kr rhe ho. Or jo bhi aap btate without any confusion mind mei copy ho jata h

[@iffrahtariq8354]

May u be rewarded and may ALLAH increase u in knowledge 😍 JAZAKALLAHU khayran ❤️

[@sinister_rules]

I can't believe this when my teacher taught me this it looks like impossible and after watching this video i am able to do all questions.

[@furzi1432]

In the last question why the first of f is id,( why its not only i,( ? Can you explain pls 🙏🙏

[@irahulgoswami]

This guy is nothing but legend 👽🙏🏻

[@ffgaming-sp7mk]

Blued relationship called frist () follow () 😂 lol. Great sir

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❤️❤️❤️

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Truly he is a good person

[@mahfuzurrahman917]

May Allah him with hidayah Ameen

[@mahfuzurrahman917]

Ameen

[@Alliswell-lb5td]

Hi

[@muhammadjuned2487]

Sir, in the 3rd example if id is terminal then first (id) would be i na sir, but you wrote id itself. can I know explanation for that

[@dakshgupta7199]

yeah, i have the same doubt. Shouldn't it be just 'i'?

[@RPK1978]

id is identifier its not combination of two terminals..so first would be id not i

[@instaertugrulgazi1622]

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With your lecture U are making me confident in my every exam instead of confused Tq so much ❤🖤

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outstanding...Respect from Pakistan...u r amazing Teacher...

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Sir i am watching this video before 3 hours of my exam . Alhamdulilah Alhamdulilah .... I have clear my concept in 10 minutes just because of you.🌠🌠🌠🌠🌠

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You are really great sir, You make the students understand the concepts easily. Your way of teaching is awesome sir. Thanks a lot .

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THANK UH SIRJI 😍

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You are the best teacher all the world

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Exam tomorrow, watching at 2x speed.

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Bhot simple h ye to 😃😃😃 thank you varun sir 🙌🙌

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wow just wow, today it was taught in my class, was not able to understand it, but you made it easy and clear...

[@pritikarajkhede7586]

thank u sir for explaining each and every steps

[@sksaakeeb]

Hats off sir

[@AsEnIxX-wtf]

Sir, I had a question for finding the FIRST for the following grammar: S -> xABC A -> a | bbD B -> a | Epsilon C -> b | Epsilon D -> c | Epsilon What is FIRST(A) in this case?

[@furzi1432]

In the last question why the first of f is id,( why its not only i,( ? Can you explain pls 🙏🙏

[@AsEnIxX-wtf]

@@furzi1432 because 'id' is the terminal, not 'i'

[@user-gs5vt4gk8p]

Sir apka method bhut acha ha ,hr cheez ko easy kardty ,,,

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Thanks a lot . Amazing lecture 💫

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[@MuhammadArslan-pe4he]

Your teachinh method is The best sir

[@EBKCS_MOKSHASHARMA]

please explain how did you take id instead of i , cause i is the first terminal of id . If it was together (a word) then please explain this too

[@nishithr6900]

It's simple bro, if it was a single terminal symbol, it would be separated like this: i | d . Since it's not, id will be considered as a terminal symbol as a whole.

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engineering without you = no future sir thank you very much for these helpful videos

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Sir plz give All other next lecture It's so helpful sir plz😢

[@mysticondeflamme]

Brilliant explanation. This lecture series is priceless.

[@gursharan_singh_saheb]

If 'id' is terminal then how did you wrote First(id)='id' Since it will be 'i'.

[@umaimamanoo2382]

U explained in easy way ☺️thnk u so much Sir 🙏ur doing a great job for students ☺️ we Al are ur thankful to u🙂

[@MMchezziscoo]

Key takeaways for me - 1) First (terminal) = terminal and First(epsilon) = epsilon 2)For finding first, focus only on the LHS of any grammar 3)if S->ABC, first of S will be first of A ** (This is if A is not producing any epsilon ) 4) if A is producing say a,b,epsilon, Then first(S) will be a,b and also First(B) 5) if S-> Epsilon, then first of S will just be Epsilon ( from point 1)

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explained in such an easy manner thanks a lot !

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[@debanjanmalakar3161]

sir i have a question for First() S → A A → aB / Ad B → b C → g sir can you help in this....

[@sajansekhu8785]

Thnkss alott sir...aap hmari bahut hlp krte h..God bless u..🙏🙏

[@noumannisar436]

Sir in last question if you see.... the first of F is only "i" so why you select whole 'id' ? You take First of S "a" in first question and now you take complete "id".

[@realPlaya7291]

"id" is a terminal, so First(id) should be "i" not "id"

[@anxgaming1810]

Yes i was also confused at this point

[@fitbro_official]

Mja aggya aaj kafi dhasu pdya apne👌👌👌👌👌

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Sir this series is very very helpful🔥🔥

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Sir,you are great in your own field 👍👍👍👍👍

[@MehediHasan-ye5sd]

Sir this lecture really help me to clear the concept of first .. Thank you

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love you sir kabhi kabhi lagta he ki ham log clg me pesaa he kyu de rahe he jab ki sri concept to aap he clear karrahe ho

[@Fitmenadir]

hope i will visit your lecture first rather than exploring the entire youtube. super explanation.

[@akshaygs2572]

Plz provide subtitles in English

[@muhammadzeeshan07]

superb, first ka topic clear ho gya bhai , Thanks

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Sir you are the best teacher ever. Please aap thodha jaldi videos daal skte hai compiler series ki sir please mere exams aa rhe sir please.

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thank you very much for making this video very helpful ❤❤❤❤❤❤❤❤❤❤❤❤❤❤💕💕💕💕💕💕💕💕💕💕😘😘😘😘

[@TrainWorlds]

Isse bahar isme kuchh hai hi nhi , Badhiya tha 10:31

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Allah Paak Aapke kaam Mai or brkat dai

[@user-ww4bw9hd8p]

Love you Men

[@shaziyanaaz7439]

Really awesome explanation 🤝 aap ka explanation se exam me rock kar sakte 😇

[@YashGupta-ty2hn]

In the last question First(F) should be i ,why it's id?

[@lalithacherukuri7618]

Here i and d are not 2 different terminals id denotes identifier So , first(F) = id/( € Here id may contain any identifier We are considering that identifier as first (F)

[@anjalirajput1311]

Sir last question m hum "id" ko "id" kyu le rhe first of "id" ko "i" kyu nii le rhe ..?

[@nexus1776]

Good question🌚

[@sakshamsharma4634]

Id is used as an abbreviation to identifier and it's not a random word so that's why 😊

[@sksahinparvej5500]

Id is actually short form of identifier it's a whole term not like separate alphabet i and d.

[@aryan_singh.k]

🤦🏼‍♂️🤦🏼‍♂️

[@noveltyvlogs6288]

Women☕