Bitwise Operators and WHY we use them

[@loayalsaid6343]

small missed detail, : the bitwise, & and | or whatever, they look if both are set, meaning both are one, not just matching, because if both are 0 for example, & will give zero and not 1 The video is amazing, Thank you, really!.

[@alexhyettdev]

That is a very good point, I should have mentioned that in the video. Thank you for pointing it out. For those finding this comment in the future: IF: a = 1 b = 1 THEN: a & b = 1 IF: a = 0 b = 0 THEN: a & b = 0

[@AntiAtheismIsUnstoppable]

I mean... how can anyone call himself a programmer and then not know the most basic of how computers operate, which literally can be learned in one day? This is like claiming to be a matematician, but not knowing how addition works. I will never ever trust any programmer who doesn't know the most basic of his own tool.

[@loayalsaid6343]

I know, and appreciate what you said, but you know, mistakes happens, and he said he forgot about it, now he does not know about it. buy anyway, Good luck with your learniing process.

[@witchoutcandy]

so in the XOR example: READ_WRITE = 4 WRITE_PERMISSION = 2 EXECUTE_PERMISSION = 1 userPermissions ^= WRITE_PERMISSION this equals 4 because 6^2 is 110^010, that IS 100, right? i've thinking... the userPermissions was 7 because of the last operator example, so 111^010 was going to be 5, and the userPermissions "lost" WRITE_PERMISSION but didnt lost execute_permission and read_permission :0 epic

[@gabeznl3591]

Also, how can the binary number 0011 equals to 6? It's always 3 in decimal...

[@johningram2153]

I've been using the term "bit" when explaining unix permissions ot people for over 25 years, and never understood why. Great video.

[@TVParsley]

You explained in 8 minutes what my CS professor couldn’t explain in an hour! Great video!

[@lanniekin]

Thank you for this! I've been a game developer for a while and had never had to deal with this concept, but it's been thrown at me with very little explanation in the cybersec course I'm taking. This was very helpful :)

[@alexhyettdev]

I am glad you found it helpful. They are definitely one of the lesser used bits of programming.

[@numbertumbers529]

This was very well-made and informative! You deserve a lot more than 94 subscribers!

[@alexhyettdev]

Thank you very much, I am glad you liked it.

[@bouzie8000]

oh how much he has grown since this comment

[@cannabisanomaly]

I always come back to this video to refresh my terrible memory on bitwise operations. Thank you Alex!

[@IsraelSilva-ho8yc]

Thank you so much for this man, got a task at work dealing with this and was a "bit" lost 🥁

[@mr.luxxyandreneo5168]

Sir really , the rwx ex. from linux was amazing , none told us such deeply, thanks for relating bin no with programming & with linux, just amazing

[@alexhyettdev]

Thank you for the kind words. I am glad my video was helpful!

[@paval1s69]

Nice! Already learned it but it was still great as a refresher and also a great introduction for newbies to the topic. A shame that the channel is not that big yet

[@alexhyettdev]

Thanks! I have only started posting regularly at the start of this month so still early days 🤞🏻

[@Nonsense116]

excellent video! I'm a Java & React dev. I've been getting into C lately reading the K&R book and was having a hard time internalizing the bitwise operators. This is exactly what I needed.

[@ShermukhammadKarimov]

Thank you so much. You helped me with my university exams. Keep going. Well done.

[@luis.barragan]

This was a really professional video, straight to the point. Thanks for saving my day.

[@alexhyettdev]

You are welcome. I am glad you found it useful.

[@timi_t_codes]

You keep things so simple!! I would love to teach like you do.

[@alexhyettdev]

Thank you for the kind words! I have never really taught anything before doing this channel. You never know what you can do!

[@Tech-Dev]

Cheers for making this concept so easy to understand.

[@alexhyettdev]

You're very welcome!

[@mossabDiae]

Great video Alex and well explained! I've been using Linux in a while and it's the first time to know the origin behind choosing those exact numbers for files permission, learned a lot! Thank you, subscribed.

[@alexhyettdev]

Thank you! Yes I don't think many people realise where those numbers come from. It does seem quite arbitrary at first glance.

[@oglothenerd]

Well, I just learned something cool about UNIX file permissions! I love this, because I use Arch, btw.

[@alexhyettdev]

That's great! I used Arch a lot when I was younger. Back when I had time to customise everything lol

[@oglothenerd]

@@alexhyettdev Lol.

[@oglothenerd]

@@alexhyettdev I am 14, so, yeah... XD

[@alexhyettdev]

@@oglothenerd I remember Arch Linux being really fast. I screwed something up though and couldn’t boot. 🤦🏻‍♂️

[@SaMcfc05]

Thank you, this makes things a lot simpler to understand

[@alexhyettdev]

You’re welcome!

[@Ctrl_Alt_Elite]

I'm learning DSA atm, and came across a constant time solution for the Power of 2 problem that uses the AND bitwise operator AMAZING videos, watched both the binary & bitwise operators vids and learned a tonne! Thanks a lot! 😁

[@alexhyettdev]

Thanks for sharing, I am glad my videos could help!

[@AFriendOfYours0]

Thank you so much. I was trying to make sense of some code I came across on GitHub and I had no idea what was going on until I watched this. Didn't think I'd have to deal with bitwise operators in JavaScript haha. Loved the simple explanation and the lighting/graphics.

[@alexhyettdev]

They are definitely quite confusing if you haven’t seen them before. Even if you have it can take a little while to work out what is actually doing.

[@abeldamtew2004]

thanks for the awesome explanation and it is good to know when and how to use them.

[@brianmwaniqi]

Great explanation as well as examples given for the application of bitwise operations

[@hernanphillip334]

Very very nice video sir, it has helped me out a lot!

[@alexhyettdev]

That's great! I am glad it helped.

[@PauloGosen]

Thank you Alex, I really learned something with this video. Keep it up

[@blaxpow]

That's excellent content. Good explanation and video editing. +1 subscriber 🎉

[@alexhyettdev]

Thanks Wesley! Glad to have you here, welcome 👋

[@DaveDemers69]

Thank you, this helped a ton!

[@alexhyettdev]

Glad it helped!

[@davidvillalobos3854]

good video,very simple, straight to the point and the example of user permission was great and easy to follow. Thanks

[@alexhyettdev]

Thank you, I am glad I could help!

[@amaniabid4476]

thank you for this because I get it very easy when you explain it

[@alexhyettdev]

You’re welcome! I am glad I could help.

[@arhanghosh2744]

Wonderfully explained. Great video

[@bouzie8000]

Informative and concise video. Good stuff

[@rcnhsuailsnyfiue2]

Great video and excellent explanation 👍

[@senriofthealexis3998]

Very concise and informative, thank you Alex

[@nazarinebeats599]

Im confused, at 4:06 the output is can read, but it looks to me that the result form the bit and should not match so I expected to see 0 ?

[@alexhyettdev]

I don't think I explained that well in this video. As one of the other comments points out (see pinned) for & operator if both bits are 1 then it will equal 1, if both bits are 0 it will equal zero. If they are both different it will be 0. So our user permissions are set to 6, which is 110 in binary. The read permission is 4 which is 100. If you do 110 & 100 you will get 100, which is why you can do: if (userPermissions & READ_PERMISSION) == READ_PERMISSION:

[@wangxuerui9949]

What an awesome video! Super helpful!!

[@alexhyettdev]

Thank you, I am glad you liked it.

[@Xander95X]

Wow, this video is great, super succinct and explained very clearly.

[@alexhyettdev]

Thank you I am glad it helped!

[@wypimentel]

Yeah, this topic was scary to me but you make it seems easy, thanks!

[@MrOvergaming]

I clicked on the like button before strarting the video!

[@mikeh7704]

This reminds me of the days I was learning Z80 machine language programming. Nice video! Are there no bitwise rotate operators, or are they rarely needed in higher-level languages?

[@vincentzacks9584]

Excellent explanation, thanks mate!

[@alexhyettdev]

You're welcome!

[@artemmozharov2492]

you can use shifts to multiply by 2pow n and there is also >>> operator or

[@jewsefjones]

Nice vid I would of liked to see the 0 0 table row and some examples uses for the last few operators

[@kdt85]

what practical uses do the left and right bit shifts have?

[@alexhyettdev]

They do have some mathematical uses. Doing x > 5 is equivalent of dividing x by 2 to the power of 5. They are also sometimes used for enum definitions which you can see here: stackoverflow.com/questions/3999922/why-use-the-bitwise-shift-operator-for-values-in-a-c-enum-definition If anyone has any other uses for them, I would be interested to know too!

[@kdt85]

@@alexhyettdev thanks!

[@JacksonBockus]

I use them all the time! Some hardware peripherals will store numerical values in weird places within registers, so to extract them and use them as numbers you need to perform a shift so that each bit is in the right place. Say we had an 8 bit register used by a temperature sensor with the lower three bits being for control and the upper five bits actually representing the temperature. You can extract the temperature by reading the value of the register and doing a left shift by three.

[@kdt85]

@@JacksonBockus thank you, yes I've come to realise they are widely used in embedded systems to directly access the pins by manipulating the register. Arduino for example used an extraction layer to turn pins on and off, if you use bit wise it's much faster and parallel

[@thoniasenna2330]

great, many thanks from Brazil!

[@MrKruges]

This is so helpful. Thank you!

[@alexhyettdev]

You're welcome!

[@moonasha]

in unity we use these for layer masks. For whatever reason, layers are stored as a series of booleans in a 32 bit (i think) integer... so if we want to mask off layer 7, we have to bit shift 1 over 7 places, 1

[@alexhyettdev]

That's interesting, thanks for sharing. I have been meaning to try out Unity.

[@MohammedRayaanPasha]

couldn't get better explanation!

[@IndisputableConnoisseur]

this is gold

[@alexhyettdev]

Thank you for the kind comment. I am glad it was useful.

[@peaceomohimua1183]

U re a life saver.... God bless u

[@unidentifiedpy]

damn man, you should've been my professor in college. now I'm gonna your student on every vid. cheers!

[@Honest_Reply900]

Very informative video, thanks and making and sharing it

[@zmo__6992]

This a very wonderful video. thanks you!

[@MoolsDogTwoOfficial]

This'll be helpful for going into raw mode (UNIX).

[@Dallascalo]

Now it makes more sense!

[@ShiloBuff]

Great explanation. Thanks

[@kevinbatdorf]

What are some common use cases for the last three you mentioned? ~ >

[@kevinpellerin6715]

Programming can be so high level, coming from microprocessors, its a little hard to not have to think about registers and interrupts.

[@civioarts]

Great video! Thank you. Makes a lot of sense, especially the practical uses. However, I miss the logical shift (>>>). Amazing video nonetheless.

[@moishie20]

Thanks. Great video

[@dumebiubogu3445]

Thanks for the video. Not sure I am understanding the point of the 2's compliment. Does that give us the answer of ~5 ? So ~5 is -6?

[@rockingshubzz3201]

If you use 2 complement it means ~5 (positive number) will be converted to -5

[@raxmax1421]

very helpful, thank you

[@Ivanesenses]

thanks Rayan!

[@o.fm.a5573]

Why is 1 negative and 0 positive? I find it confusing 😅

[@theEtch]

because it's positive by default. the first bit is reserved for that I think.

[@theEtch]

as it's a signed byte

[@oglothenerd]

I am needing to use them because I am making a voxel game.

[@alexhyettdev]

That’s awesome. I have had “make a game” on my todo list for a long time. One of these days.

[@oglothenerd]

@@alexhyettdev Highly recommend Rust with the Bevy engine!

[@SurajAbdullai]

@@alexhyettdev Hi pls my account got banned and i need your help

[@bijjepurushotham7667]

nice explanation

[@jumbo999614]

Please tech me this code Below is part of code that someone wrote for making dot matrix led 8x8 text scrolling byte bitmap[8][7]; int numZones = sizeof(bitmap) / 8; // One Zone refers to one 8 x 8 Matrix ( Group of 8 columns) int maxZoneIndex = numZones - 1; int numCols = numZones * 8; // Converts row and colum to bitmap bit and turn it off/on void Plot(int col, int row, bool isOn) { int zone = col / 8; int colBitIndex = x % 8; byte colBit = 1

[@oreokarail]

Don't stop. There's a long way to go...

[@alexhyettdev]

Yes it is definitely a long journey!

[@ericni2216]

I love to have less variables thank you, my arduino now can fit more

[@shinkansen1907]

thanks

[@hariram5654]

Respect from INDIA😇

[@robertvalentic4939]

also good for networked games

[@hydrotd]

came for shift

[@endribehari6645]

You can a and b not 6 and 7

[@realdragon]

I discovered using bitwise operators is faster than dividing by 2 for floats

[@alexhyettdev]

Good to know! Thanks for sharing.

[@leonardeuler4]

Which language?

[@realdragon]

@@leonardeuler4 C

[@Debianguy31]

​@@leonardeuler4any Language

[@martinfinch5011]

Also multiplying by 2 using the bit shift left operator is faster as well I believe

[@UnknownGamer-lw7zp]

Tq

[@DinHamburg]

how can you make a vid about bits and not mention 'Hackers Delight' ?? fail

[@meerkatpowergaming9412]

This video is a bit loaded for someone who is truly a beginner.

[@alexhyettdev]

Noted. I will try and do some more videos for true beginners in the future.

[@meerkatpowergaming9412]

@@alexhyettdev Yeah I just find it truly hard to find resources for others on this specific subject. Even 10 years ago.

[@seanfull7123]

Teach my class plz

[@alexhyettdev]

Is your teacher not very good, or just boring? 🤣

[@newbsagehaha]

this video sucks. is too short. too fast. too annoying. too script reading. low energy. and bad instruction.

[@newbsagehaha]

stock video of black guy in first 7 seconds, tons of stupid sh't in your background, annoying trendy cuts and camera movements. yep youre a youtuber. nice job.