First and Follow in compiler design

[@-R-KolaNikhil]

Hy sir I passed compiler design subject because of your vedios thank you so much sir yesterday we got jntuk results sir

[@SudhakarAtchala]

Congrats

[@akshitajha1209]

32:15 Why is first of S d,g and not d,g,h because if we put epsilon in place Of B in A->BC, then we should consider C productions for calculation of first

[@kvinay8412]

Then it becomes first of A=h,epsilon

[@akhilravilla8861]

I thought the compiler design is the difficult subject but your vedios made the subject easy. Thankyou..

[@SudhakarAtchala]

Hai Akhil, plz go through my videos once. Definitely you will like more videos. Thanks
for your encouragement and support towards our channel. Share my sessions with your friends and subscribe to our channel.Keep on following my sessions. Thank you so much.

[@jeremiahthomas7594]

was stryggling to unerstand this, thank you sir

[@SudhakarAtchala]

Welcome. Plz subscribe to the channel and if possible share with your friends. Thanks in advance.

[@s1mple..]

i wrote the semester exam well, by watching your lectures thank you sir❤,for bottom up parsers, we can draw flow graph little easier,hope you will add that in your next videos❤

[@SudhakarAtchala]

Excellent

[@sundeepsaradhi]

Very clear explanation sir.👍

[@SudhakarAtchala]

Thanks sir.

[@gamingwithbadboi3814]

Example 4: S--->ACB/CbB/Ba
A--->da/BC
B--->g/€
C--->h/€
So first should be {a,b,d,g,h,€} but you wrote only {a,b,d,g,h} but € not written

[@SudhakarAtchala]

Okay. Plz subscribe to the channel and if possible share with your friends. Thanks in advance..

[@priyankavasam07]

Wonderful explaination sir, got clear idea how to find first and follow sets. Thankyou for discussing so many examples..its very helpful

[@SudhakarAtchala]

You are most welcome. Plz subscribe to the channel and if possible share with your friends. Thanks in advance...

[@zaibafathima8101]

Amazing Teaching Sir...❤️❤️ Suddenly They announced Exmz(JnTu ATP)I'm following your videos😍I didn't listen online class and even I didn't understood their class ..Today Date:16-OCT-2020..I'm preparing for my Exm ...When I get results I will Update 😅

[@SudhakarAtchala]

All the best Fathima for your exams

[@SudhakarAtchala]

I am from JNTU kakinada

[@zaibafathima8101]

@@SudhakarAtchala 🤩🤩I'm so happy ..Now I'm watching your videos and I got a comment ..I will upadte my results too Today date :16-Oct -2020..After results I will Update u Sir (In First and Follow video I will upadte my results)Due to this lockdown ..Thank God I got u . I thought I will fail Later My lecturer Shared your video links ❤️❤️Suman Sir

[@zaibafathima8101]

@@SudhakarAtchala Thank You Sir ..Plz Don't be dishearted for DS

[@zaibafathima8101]

@@SudhakarAtchala I'm From JNTU Anantapur 😬 Thankyou So much For letting me to know

[@Gokulraj-ld2my]

Life saviour.. thank u so much sir

[@SudhakarAtchala]

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[@zallalnawab786]

I SALUTE YOUR TEACHING SKILL SIR .
U R ONE OF THE WELL KNOWLEDGABLE PROFESSOR IN THIS UTBE . I ALWYS SUPPORT YOU KEEP IT UP.
SIR YOUR WAY OF TEACHING IS REALLY UNDERSTANDABLE . I REALLY APPRICIATE YOUR KNOWLEDGE. KEEP UPLOADING THE VLOGS.
YOU REALLY DESERVES MILLION'S OF SUBCRIBERS.
THANKS A LOT SIR U VANISHED MY DOUBTS 🙏🏻

[@SudhakarAtchala]

It's my pleasure. Plz subscribe to the channel and if possible share with your friends. Thanks in advance..

[@arbaj_the_eagle]

Salute to u sir. Ur doing great job.
Power 💪 to u

[@SudhakarAtchala]

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[@s2csea02abhishekca7]

I hope I will do better in the semester exam.I have sem exam this Friday .I had failed in internals but hope I will do better in semester exam.Thank you sir

[@SudhakarAtchala]

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[@vikibhai6]

I appreciate your hard work sir❤❤

[@SudhakarAtchala]

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[@hodgensonkasitu9328]

Thank you Sir. This has really helped me understand parsing trees using top-down parser.

[@SudhakarAtchala]

Most welcome. Plz subscribe to the channel and if possible share with your friends. Thanks in advance...

[@hodgensonkasitu9328]

@@SudhakarAtchala Have subscribed already...

[@karthikreigns5495]

Underrated teacher😊

[@SudhakarAtchala]

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[@vikibhai6]

You deserve 1m subscribe
❤

[@SudhakarAtchala]

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[@avonflex5031]

At ex 4 32:11 wen we substitute B as epsilon than it will bcome A-->C from A-->BC , so again shouldnt we calculate first of C And include..?

[@SudhakarAtchala]

ya what you said is correct . We need to calculate first(C) also. But there is no change is no change in result why because we calculated first(C) for the production first(CbB). Thanks for your observation.

[@SudhakarAtchala]

Hai avon flex
Thanks for your encouragement and support towards our channel.Share my sessions with your friends and subscribe to our channel.Keep on following my sessions.

[@asherabraham3034]

Won 't epsilon be in the first(S)

[@vikramoxford6055]

Why people's comparing teachers to God now I understand ❤

[@SudhakarAtchala]

So nice of you but that is worst comparison. Plz subscribe to the channel and if possible share with your friends. Thanks in advance...

[@amirtharani4339]

Sir no words, marvelous

[@SudhakarAtchala]

Thanks a lot

[@NrGangster-m8z]

fantastic teaching sir❤

[@SudhakarAtchala]

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[@definitesquare]

You are god sir

[@SudhakarAtchala]

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[@salonisharma]

Thank you for the video sir.It is really helpful.

[@SudhakarAtchala]

Glad to hear that Saloni. Plz subscribe to the channel and if possible share with your friends. Thanks in advance.

[@sirisha9156]

Thank you sir really very nice and clear explanation sir tq very much sir

[@SudhakarAtchala]

Keep watching

[@SudhakarAtchala]

plz subscribe to the channel and if possible share with your friends. Thanks

[@sunildawadi4386]

Sir, do we have to remove both left recursion and left factoring before finding first and follow?

[@SudhakarAtchala]

Yes. Plz subscribe to the channel and if possible share with your friends. Thanks in advance.

[@sainani3926]

Salute to the legend for students

[@SudhakarAtchala]

Thanks. Please like the video, subscribe to the channel, and share it with your friends. Thanks in advance.

[@keerthikarthik098]

Happy Teacher's Day sir!!

[@SudhakarAtchala]

Thank you so much.

[@tejaswinimannuru9729]

very easily understandable .tq sir

[@SudhakarAtchala]

Hai Tejaswini
Thanks for your encouragement and support towards our channel.Share my sessions with your friends and subscribe to our channel.Keep on following my sessions.

[@AppaniMadhavi]

happy guru pournami sir

[@teczgaming7311]

Nice🎉

[@SudhakarAtchala]

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[@nishantkumartomar6901]

Sir, I think there should be an epsilon in first(S) at 32:30

[@SudhakarAtchala]

ya, thanks for correction. Plz subscribe to the channel and if possible share with your friends. Thanks in advance.

[@manojpadhi8548]

Very well explained Sir.

[@SudhakarAtchala]

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[@joelnada3483]

Thank you sir for the video lecture......

[@SudhakarAtchala]

Hai Joel Nada, plz go through my playlists once. Definitely you will like more videos. Thanks
for your encouragement and support towards our channel.Share my sessions with your friends and subscribe to our channel.Keep on following my sessions. Thank you so much.

[@Sarishanischal]

you made toc and cd easy!!!

[@SudhakarAtchala]

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[@unique_bhanu]

thank you so much sir

[@SudhakarAtchala]

Most welcome. Plz subscribe to the channel and if possible share with your friends. Thanks in advance..

[@vishnu3141]

nice sir

[@SudhakarAtchala]

Thanks. Plz subscribe to the channel and if possible share with your friends. Thanks in advance.

[@samudragupta2587]

Very intuitive.

[@onyinyechiatula4337]

Sir please which textbooks can I use to see practice questions for compiler design

[@SudhakarAtchala]

Alfred aho text book. Plz subscribe to the channel and if possible share with your friends. Thanks in advance..

[@onyinyechiatula4337]

@@SudhakarAtchala Thank you, I'm already a subscriber

[@eakubislam4439]

Thank You Sir...❤

[@SudhakarAtchala]

Welcome. Plz subscribe to the channel and if possible share with your friends. Thanks in advance.

[@shanthirajyam]

Thanks lot sir

[@SudhakarAtchala]

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[@c.danielpremkumar8495]

Excellent !

[@SudhakarAtchala]

Glad you like it daniel premkumar Plz subscribe to the channel and if possible share with your friends. Thank you so much.

[@vuthemanh4269]

so good

[@SudhakarAtchala]

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[@ananyamishra6411]

you are just god

[@SudhakarAtchala]

Thanks. Plz subscribe to the channel and if possible share with your friends. Thanks in advance.

[@cododita6731]

Sir why follow does not accept € ??

[@SudhakarAtchala]

i.e the rule chandra.

[@berrah6514]

Thank you Sir .

[@SudhakarAtchala]

Hai ber rah, plz go through my playlists once. Definitely you will like more videos. Thanks
for your encouragement and support towards our channel. Share my sessions with your friends and subscribe to our channel.Keep on following my sessions. Thank you so much.

[@SiddharthGawande-bd8do]

thanks sir

[@SudhakarAtchala]

Most welcome. Plz subscribe to the channel and if possible share with your friends. Thanks in advance..

[@SuperStriker_]

Thank you sir

[@SudhakarAtchala]

Plz subscribe to the channel and share with your friends thank you so much.

[@ramaraog4630]

sir kindly upload the remaining topics of compilerdesign

[@SudhakarAtchala]

K. I will upload remaining videos as early as possible.

[@ramaraog4630]

Sir kindly upload thegarbage collection,trace based collection,simple code generator,register allocation and assignment,dynamic programming code generation,data flow analysis,constant propagation,partial redundancy elimination,back patching,type checking,type equvalance,intermediate code for procedure

[@SudhakarAtchala]

K.

[@savithaprasad1804]

Sir first(s) should contain epsilon in example 4

[@SudhakarAtchala]

Not needed because we can substitte € there

[@SudhakarAtchala]

Hai Savitha, plz go through my videos once. Definitely you will like more videos. Thanks
for your encouragement and support towards our channel. Share my sessions with your friends and subscribe to our channel.Keep on following my sessions. Thank you so much.

[@somyasahu2000]

Sir according to which university syllabus you are teaching??

[@SudhakarAtchala]

UNIT - I
Introduction to Compiler: Compiler, The Phases of Compiler, Approaches to compiler
Development-Boot Strapping, Lexical Analysis: The role of lexical analyzer, Input buffering,
Specification of tokens, Recognization of Tokens, A language for specifying lexical
analyzers (LEX).
UNIT - II
Syntax Analyzer: The role of parser, Writing a Grammar-Elimination of Left recursion and
Left factoring. Top down parsing -Recursive descent parsing, Predictive parsing,
Preprocessing steps required for predictive parsing, LL (1) grammar.
UNIT - III
Bottom up parsing: Shift/Reduce parsing, Operator Precedence Parsing, LR parsers-SLR,
CLR and LALR, Error recovery in LR parsing, YACC - automatic parser generator.
UNIT - IV
Syntax Directed Translation: Syntax directed Definitions, Construction of syntax trees
Attribute Grammars- S-attributed and L-attributed grammars, Type checking. Run time
storage: Storage organization, storage allocation strategies. Intermediate code generation:
Intermediate code forms-Syntax tree, polish notation and three address code, implementation
of three-address code, Declarations, Boolean Expressions and Control-flow statements.
UNIT - V
Code optimization: Introduction, The principle sources of optimization, Loop optimization,
and Peephole optimization, optimization of basic blocks.
Code generation: Design issues, object code forms, A simple code generator, Register
allocation and assignment, DAG representation of Basic Blocks, Code generation using
DAG.

[@SudhakarAtchala]

Hai Somya, plz go through my videos once. Definitely you will like more videos. Thanks
for your encouragement and support towards our channel. Share my sessions with your friends and subscribe to our channel.Keep on following my sessions. Thank you so much.

[@somyasahu2000]

@@SudhakarAtchala thnku sir

[@zaibafathima8101]

JNTU😊😊...I'm From JNTU Anantapur (Andhra Pradesh)

[@ramaraog4630]

Can u upload any remaining topics of compiler design

[@SudhakarAtchala]

Definitely. Tomorrow i will upload Backpatching, Intermediate code for procedures, intermediate code for switch statement, Target machine model, Simple code generator algorithm, type checking and data flow analysis.
on 17th and 18th i will upload remaining topics.

[@ramaraog4630]

Sir kindly release the remaining topics of 4th and 5th units

[@SudhakarAtchala]

I will upload remaining videos with in 1 week .From tomorrow onwards daily I will upload 3 videos.

[@manoj_fitness_ms]

prasad prefered me to subscribe to this channel

[@SudhakarAtchala]

Thanks.

[@c.d.premkumar6867]

32.32: First(C) = h / epsilon

[@SudhakarAtchala]

ya prem. Plz subscribe to the channel and if possible share with your friends. Thank you so much.

[@ramaraog4630]

Sir kindly upload the remaining topics of compiler design of 4th and 5th units.as main exams are commencing from may 2019

[@SudhakarAtchala]

Ok

[@SudhakarAtchala]

Can you Please tell the exact date of the exam so that I will try to upload the remaining videos before that date . I'm busy with several works from the past 1 week . Definitely I try to upload from 30 I. e. Tuesday onwards.

[@ramaraog4630]

@@SudhakarAtchala ok sir i wiil tell

[@saikrishnasonti5990]

S--->A
A--->aB|Ad please reply
First(s) &first( A)

[@SudhakarAtchala]

First(S)=First(A)=a

[@sheezanawaz476]

S  AB
A  DG | ε
B  *AB | ε
D  id | ( S
G  +DG | ε
Plz find follow...