Bitwise Operators and WHY we use them

Рет қаралды 63,686

Күн бұрын

Bitwise operators are one of the least understood parts of programming when you are first starting out. In this video, I cover what they are and why we use them!
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⏳ TIMESTAMPS
00:00 Introduction
00:43 Why do we use Bitwise Operators?
01:55 Unix file permissions
02:54 6 Bitwise Operators
03:01 AND Operator
04:08 OR Operator
05:17 XOR Operator
06:01 NOT Operator
06:30 Negative Numbers
07:24 Left Shift and Right Shift
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Пікірлер: 115

@loayalsaid6343 11 ай бұрын

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 11 ай бұрын

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 4 ай бұрын

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 4 ай бұрын

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 3 ай бұрын

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 2 ай бұрын

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

@cannabisanomaly 4 күн бұрын

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

@johningram2153 4 ай бұрын

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

@lanniekins666 Жыл бұрын

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 Жыл бұрын

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

@timi_t_codes 11 ай бұрын

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

@alexhyettdev 11 ай бұрын

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

@taylorvicente7325 Ай бұрын

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

@luis.barragan Жыл бұрын

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

@alexhyettdev Жыл бұрын

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

@ShermukhammadKarimov 5 ай бұрын

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

@abeldamtew2004 2 ай бұрын

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

@numbertumbers529 Жыл бұрын

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

@alexhyettdev Жыл бұрын

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

@bouzie8000 3 ай бұрын

oh how much he has grown since this comment

@DaveDemers69 Жыл бұрын

Thank you, this helped a ton!

@alexhyettdev Жыл бұрын

Glad it helped!

@senriofthealexis3998 3 ай бұрын

Very concise and informative, thank you Alex

@PauloGosen 5 ай бұрын

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

@paval1s69 Жыл бұрын

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 Жыл бұрын

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

@bouzie8000 3 ай бұрын

Informative and concise video. Good stuff

@amaniabid4476 Жыл бұрын

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

@alexhyettdev Жыл бұрын

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

@arhanghosh2744 3 ай бұрын

Wonderfully explained. Great video

@SaMcfc05 10 ай бұрын

Thank you, this makes things a lot simpler to understand

@alexhyettdev 10 ай бұрын

You’re welcome!

@Ctrl_Alt_Elite 8 ай бұрын

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 8 ай бұрын

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

@hernanphillip334 Жыл бұрын

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

@alexhyettdev Жыл бұрын

That's great! I am glad it helped.

@Tech-Dev 7 ай бұрын

Cheers for making this concept so easy to understand.

@alexhyettdev 6 ай бұрын

You're very welcome!

@Honest_Reply900 2 ай бұрын

Very informative video, thanks and making and sharing it

@ShiloBuff 2 ай бұрын

Great explanation. Thanks

@MrKruges 3 ай бұрын

This is so helpful. Thank you!

@alexhyettdev 3 ай бұрын

You're welcome!

@wangxuerui9949 3 ай бұрын

What an awesome video! Super helpful!!

@alexhyettdev 3 ай бұрын

Thank you, I am glad you liked it.

@moishie20 3 ай бұрын

Thanks. Great video

@davidvillalobos3854 11 ай бұрын

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

@alexhyettdev 11 ай бұрын

Thank you, I am glad I could help!

@blaxpow Жыл бұрын

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

@alexhyettdev Жыл бұрын

Thanks Wesley! Glad to have you here, welcome 👋

@mossabDiae 11 ай бұрын

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 11 ай бұрын

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

@mr.luxxyandreneo5168 Жыл бұрын

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 Жыл бұрын

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

@raxmax1421 21 күн бұрын

very helpful, thank you

@vincentzacks9584 3 ай бұрын

Excellent explanation, thanks mate!

@alexhyettdev 3 ай бұрын

You're welcome!

@thoniasenna2330 6 күн бұрын

great, many thanks from Brazil!

@AFriendOfYours0 Жыл бұрын

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 Жыл бұрын

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.

@Xander95X 7 ай бұрын

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

@alexhyettdev 7 ай бұрын

Thank you I am glad it helped!

@mikeh7704 4 ай бұрын

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?

@wypimentel 4 ай бұрын

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

@MohammedRayaanPasha 10 күн бұрын

couldn't get better explanation!

@Dallascalo Ай бұрын

Now it makes more sense!

@joemcerlane 11 күн бұрын

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

@IndisputableConnoisseur Жыл бұрын

this is gold

@alexhyettdev Жыл бұрын

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

@bijjepurushotham7667 3 ай бұрын

nice explanation

@oglothenerd 10 ай бұрын

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

@alexhyettdev 10 ай бұрын

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

@oglothenerd 10 ай бұрын

@@alexhyettdev Lol.

@oglothenerd 10 ай бұрын

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

@alexhyettdev 10 ай бұрын

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

@artemmozharov2492 4 ай бұрын

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

@MrOvergaming Ай бұрын

I clicked on the like button before strarting the video!

@MoolsDogTwoOfficial 2 ай бұрын

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

@kevinpellerin6715 Жыл бұрын

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

@whenlifegivesyouLSD 9 ай бұрын

This channel is a gem

@alexhyettdev 9 ай бұрын

Thanks, I am glad you like it!

@angelitocasasis5947 Ай бұрын

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

@dumebiubogu3445 Ай бұрын

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?

@nazarinebeats599 9 ай бұрын

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 9 ай бұрын

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:

@moonasha 11 ай бұрын

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 11 ай бұрын

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

@kevinbatdorf 7 ай бұрын

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

@kdt85 8 ай бұрын

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

@alexhyettdev 8 ай бұрын

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 8 ай бұрын

@@alexhyettdev thanks!

@JacksonBockus 2 ай бұрын

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 2 ай бұрын

@@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

@oreokarail Жыл бұрын

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

@alexhyettdev Жыл бұрын

Yes it is definitely a long journey!

@oglothenerd 10 ай бұрын

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

@alexhyettdev 10 ай бұрын

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

@oglothenerd 10 ай бұрын

@@alexhyettdev Highly recommend Rust with the Bevy engine!

@SurajAbdullai 6 ай бұрын

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

@jumbo999614 Ай бұрын

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