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

[@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?

[@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🙏

[@abdulaleem7989]

100% agreed

[@mimis.5139]

So true

[@abirpaul9027]

Sigma male

[@mujraimgamingff1583]

Agree

[@lonewarrior2832]

good

[@LifeinDublin-bf6fr]

Wish someone had recommended this channel earlier. Kudos for the great passion and clarity.

[@debanjanghosal618]

To people confused why FIRST() was id instead of only i: In formal grammar, id typically represents an identifier (which can be any valid identifier name), rather than a specific character. It's often used as a shorthand for a class of strings that are identifiers, such as variable names in programming languages.

[@jaydattapatil9544]

Providing such high level knowledge for free... Great work 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!!!!

[@tanvirbadsha1629]

I don't know how to thank you. I spent 2-3 hours watching my varsity video then random utub video but still I was confused af. Then I watched this as my last video. Now I got it. Thanks a lot, brother. Take love from Bangladesh.

[@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!!

[@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 👍👍...

[@annieannie7060]

Great job sir you're way teaching superb... I can understand each nd everything in few minutes after taking you're lacture i m from PAKISTAN

[@abdulazeezshaik6072]

Hi

[@DCSAamirSuhail]

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

[@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.

[@YashBhamare524]

Legends are watching before 3 hours of exam.

[@darkgg1658]

😂😂 ekdm sahi

[@Alonkete]

Legends are getting back in all semesters❤

[@NiharikaKohli12]

1:30 hour before exam

[@YashBhamare524]

@@NiharikaKohli12 😂All the best for your exam

[@NiharikaKohli12]

@@YashBhamare524 thank you thank you 🤣

[@1511kanika]

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

[@viral_editz_]

Right

[@fantasy11kannada]

thank you sir. Really dont praise anyone,but after watching your videos i want thank you for everything you've thought

[@Hitanshsinghal27]

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

[@md.jobair2520]

Thank you so much brother. ❤❤(zajakallahu khairon).kitna awesome video hai yr, ek video mai sob kuc clear hogaiya.take love from Bangladesh🇧🇩🇧🇩❤️❤️❤️🇧🇩🇧🇩🇧🇩

[@deepakmahajan4245]

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

[@rahulkaushik8897]

You are God Gifted. Awesome.👍👏👏👍👍👏👏🙏🙏

[@shettysakshi7368]

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

[@thebigbull2544]

You are far best teacher then of my collage where I pay 70k per sem . LOL

[@umerimran1622]

kamal smjhaty ho ap yr❤️❤️❤️ last 2 years se apka smj k 1 rat phly exam me B ya B+ ajata. You are Great. Love From Pakistan🇵🇰🇵🇰🇵🇰

[@sahilgupta5546]

Sir yeh kai din ke lectures mein bhi samajh nahin aaya tha jo apne 10 minute mein samjha diya! Thank you so very much! God bless you

[@samadshaik]

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

[@vishalshaw1570]

same here as of now

[@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

[@VishwaSone]

Bro id is a terminal it not separate

[@abhisheklayek4872]

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

[@iqrashakoor2659]

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

[@ritiksharma6196]

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

[@irahulgoswami]

This guy is nothing but legend 👽🙏🏻

[@kalpanaverma1269]

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

[@MontessoriLearning-eh2pn]

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.🌠🌠🌠🌠🌠

[@vanshgupta24]

sir kya bat hai kya baat hai apne toh moj kra di ekdum clear cut samjha rakha hai! waah sir waah!

[@mangapatnamthahareen2437]

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

[@rockyetchison3380]

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

[@FinanceWithSanjeevv]

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

[@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 ❤❤❤

[@arinael]

vaah sir aapke videos dekhne ke baad mera cgpa 6.5 se 8 tak chale gya he thank you 3rd year me hi internship mil gyi kyuki average cgpa 8+ ho gya he a b

[@aggarwalsachin4854]

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

[@Ammaradreamart]

Thanks a lot . Amazing lecture 💫

[@Gg_editsss]

thank u bro u always save us at the last minute. Ur videos are just study in less time types. I hope u get everything u want in ur life😁

[@iffrahtariq8354]

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

[@jagritapaul9367]

Sir, really you're the ULTIMATE SAVIOR

[@fitbro_official]

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

[@rafiullahaqleem5890]

U r doing amazing job love and respect from Pakistan💗

[@adarshsharma3413]

Exam tomorrow, watching at 2x speed.

[@debanjanmalakar3161]

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

[@vishnus2567]

@9:25 while finding FIRST(E'), There is an ε appear at the end. So don't we need to find FIRST(T) also ?🤔

[@shahzebkhan4233]

mera kbi kbi dil krta hai college ke jaga Gate Smashers ko monthly fee dia kru...

[@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.

[@AmitKumar-gl4rz]

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

[@AmitKumar-gl4rz]

Getting the point 👍👍👍👍😀

[@arkaghosh8430]

Sir, Just Awesome !!

[@shubhamrajput4908]

Imagine a night before exam without his Lectures.....Wish my faculty watch him too even facultys are confused what about students.

[@Mariaabid-t9y]

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

[@sonisona1419]

You are the best teacher all the world

[@sanketbhangale5788]

Loved the way you teach... Thank you so much sir..

[@TECHZONEUNIQUE]

Superb Video sbse achhi tareeky se samjhaya bhai aapne

[@masoodshuja5479]

lots of appreciation and love from Pakistan sir..❤❤❤

[@ffgaming-sp7mk]

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

[@tarunverma3335]

Sir this series is very very helpful🔥🔥

[@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 🙏🙏

[@aniketkhare8635]

explained in such an easy manner thanks a lot !

[@Angel-pr3db]

Awesome sir 👍

[@Saksham317]

Sir agar aap mere clg main padhate toh main roj class leta with full of concentration k sath TQ 🙏

[@Fitmenadir]

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

[@takwirultayasur1944]

Sir How can u be so good.Masha Allah .Allah bless u.

[@saurbhardwaj3011]

❤️❤️❤️

[@mahfuzurrahman917]

Truly he is a good person

[@mahfuzurrahman917]

May Allah him with hidayah Ameen

[@mahfuzurrahman917]

Ameen

[@Alliswell-lb5td]

Hi

[@decentcoder]

wah wah kia bt hai... good job thank you!!

[@aneeshsha5097]

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

[@mysticondeflamme]

Brilliant explanation. This lecture series is priceless.

[@muntahariaz4332]

Excellent sir.... very simple and easy way explained 💯👍🥀🌹🌹🥰🥰😍🤩

[@mayankkumar6628]

Hail the lord 🙏 bow down to the king

[@taniyapal324]

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

[@bhuvanr3031]

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

[@diyashezadi21]

koi topic samaj na ara ho or yt py ao search kro sir ki video miljay to sari tension wae khatam hats of to you❤

[@sajansekhu8785]

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

[@20-shaluagrawal42]

Very helpful sir😊

[@MuhammadArslan-pe4he]

Your teachinh method is The best sir

[@ShubhamSingh-cd1jf]

Tomorrow is my Compiler Design Exam 👍👍👍🥰🥰🥰

[@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?

[@pritikarajkhede7586]

thank u sir for explaining each and every steps

[@ravigupta-nx4qf]

sir aapke samjhane ka tareeka bhott accha hai...thank you soo much!!!

[@farhanaaktersuchi9688]

Sir, I always follow your lecture.You're really great. Love from Bangladesh ❤

[@prashantjannu2652]

No one can teach like u sir ❤🙏

[@muskansethi7139]

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.

[@Vishalllllllllllll]

Really impressed nd understand all the things

[@ConnectWithAzfar123]

Allah Paak Aapke kaam Mai or brkat dai

[@SamiAhmed-z4s]

Love you Men

[@tharunmadishetti2796]

Waah never disappoints

[@sakararyal1630]

Wow, very helpful. Thank you so much baby.

[@mehnazaslam6135]

Zbrdst vdeo....clear all concepts....

[@ranjeetkumar2051]

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

[@shaziyanaaz7439]

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

[@sutamasarkar7745]

sir according to 8:19 ,then why we don't add the strings of BC for S in the 1st question,is it because of the next terms ghi &jkl???

[@tolichukkaakanksha3241]

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

[@prestoX]

You are spectacular !

[@gyanprakash302]

Great explanation, Thankyou SO Much !!!

[@poppychan1953]

dude you lifesaver my exams went well because of you

[@mr_tejas_14]

THANK UH SIRJI 😍

[@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.

[@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)