Rust Tutorial #6 - Arithmetic and Type Casting

[@TheRedPython]

6:48 “I don’t know exactly what 255 divided by 10 is” 😭

[@luigi-fan554]

I wonder what 255 divided by 10 is, hmm, tricky question

[@TheSpartacusS]

I laughed too hard at this :D

[@jasongracae1780]

I paused the video, exited full screen and scrolled down to the comments to type the exact same thing. 😒

[@eineatombombe]

this guy is here being a software engineer and teaching us rust while not knowing what's 255/10

[@bravobessa3684]

😀

[@m-zurowski]

jokes aside - some ppl at third year of mechanical engineering at my university need to use a calculator for exactly that sort of 'arithmetics' XD

[@philaskytech]

Be easy on yourself, I like seeing the little mistakes; helps us all learn. These tutorials are amazing, and you are clearly very good at teaching and understanding CS. Thanks TIm!

[@lazerpie101]

A couple notes: integer division in Rust will always round down using the unwrap_or({backup_value}) instead of just unwrap() will prevent runtime errors

[@unicorn_tamer]

I can finally watch another coding video on my two monitors after almost 2 years!

[@jasongracae1780]

Python: int_input = int(input1) Rust: let int_input: i64 = input.trim().parse().unwrap(); Tim: We can now just print it!

[@Eva-tf5ud]

This rust line does nothing without input variable (let mut input = String::new(); io::stdin().read_line(&mut input).expect(" ");) this should also be included

[@someshvemula9966]

As always, liked your video even before watching it.

[@TechWithTim]

MVP

[@tama3442]

*What is the Gospel?* The true gospel is the good news that God saves sinners. Man is by nature sinful and separated from God with no hope of remedying that situation. But God, by His power, provided the means of man’s redemption in the death, burial, and resurrection of the Savior, Jesus Christ. Ephesians 2:8-9 For it is by grace you have been saved through faith. And this is not your own doing; it is the gift of GOD, not a result of works, so that no one may boast. Romans 10:9 9 because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. JESUS CHRIST can come anytime! REPENT OF YOUR SINS Just Believe ❤️ Love you and GOD BLESS

[@therealworldlibrary]

@@tama3442 yeah no I don't give a damn

[@michaelsciortino3385]

Damn I can bbq a whole cow with all the roasting going on in the comments here about 255/10

[@gjermundification]

13:26 This is most likely the smallest number allowed by i32 as fo i8::Max + 1 = -128

[@introspecticon]

I'm surprised the compiler didn't catch the i32::MAX + 1 overflow. Wonder if that's intentional or an oversight

[@DuskyDaily]

It's not actually i32::MAX + 1, but it's (i32:MAX as i64) + 1. I mean i64 can store i32:MAX + 1. So overflow occurred when it tried to convert it back to i32 at line 5. I guess, that's how it works.

[@jasongracae1780]

Tim: "So that's all really all I want to show in the video". Wow so short!

[@playniuniu]

Thanks so much for this tutorial.

[@lukeh7052]

When printing an f64, why doesn't the floating part appear even though it is required in rust to be an f64? Same applies to f32.

[@jasongracae1780]

Isn't that 'INVISIBLE CHARACTER'🧙🏻‍♂ just a ? Or there is some other thing too?

[@sirbackenbart]

Yes, it is a . trim only removes "whitespaces" (prefixed & suffixed) which are defined to also include linebreaks.

[@codeandtalk6]

Waiting for this video

[@camilo1u2b]

Prove that you don't need to be good at math to be a great programmer. what 255/10 is? min: 6:45

[@gabehcuodsuoitneterp203]

What is casting with the underscore and without the keyword 'as' really doing?

[@m-zurowski]

@6:51 - my brain starts singing USA's anthem

[@djemi3etelminigeekandhacke343]

The errors you presented in rust such as overflow or adding data of two different types, why these kind of errors are not reported in C such as adding long int with short int, or adding unsigned int with signed int ?

[@marcotroster8247]

Haha this kind of pedantic errors seems very familiar. It's about the same as compiling C89 with ansi pedantic and Wall Werror. Happy coding 😂

[@subee128]

Thanks

[@patricklittle1002]

So literally, the compiler complains when doing normal overflow math and doesn't automatically promote, but runs just fine without warnings when that's the only time I would expect this strong language to catch something?

[@stas4112]

Im honestly surprised by the many ways that you can declare the casting of a literal. I usually don't like when languages have many ways to do one thing, and I thought rust was one of those anal languages that makes everyone better by having no alternatives

[@maker._]

I wonder why, if x and y were f64 and they enforce the need for decimal, why was x * y not 2550.0? 🤔

[@sephalopod]

How did his "println!" work there was no semicolon

[@rami_atallah]

Because it is the last thing to run. Think the semicolon in rust is same as the use of semicolon in css. (Ps: If i am wrong someone correct me)

[@erfer981]

when we return something (in the last line or in a function) we dont need to type a ';' if you want to type a ';' then you can use the return keyword

[@johnbennett1465]

If Rust caught overflow at runtime then being so picky about types could make sense. Without that, it does nothing but annoy the programmer. C implemented a mostly reasonable set of automatic conversions for numbers half a century ago. I can see reasons for tweaking the exact rules, but no reason to not automatically do safe conversions.

[@dynfoxx]

It does catch overflow in debug mode. While i agree with you its not that much harder to get conversions by just adding .into() . Rust wants to be clear that there is a conversion happening.

[@tudormurariu8016]

Is this assembly? :))))

[@kevinwalters2887]

I have a feeling they named it 'rust' is bc it's the reheaded step-child you gotta tell it everything! lol

[@jasongracae1780]

9:10 Why would I want that?

[@maxovicsteiner9646]

255/10 💀

[@holonaut]

it's 25 and then something, not gonna calculate the exact value

[@maxovicsteiner9646]

@@holonaut someone didn't go to primary school

[@unixwastaken]

@@holonaut bruh for dividing by 10 you just move over the period to the left one time💀

[@tag_of_frank]

need more explanation of parse + unwrap why is that needed don't get it

[@pravachanpatra4012]

Can you collab with tiff in tech

[@mrpancakes]

255 divided by 10 is 25.5 lol

[@tama3442]

*What is the Gospel?* The true gospel is the good news that God saves sinners. Man is by nature sinful and separated from God with no hope of remedying that situation. But God, by His power, provided the means of man’s redemption in the death, burial, and resurrection of the Savior, Jesus Christ. Ephesians 2:8-9 For it is by grace you have been saved through faith. And this is not your own doing; it is the gift of GOD, not a result of works, so that no one may boast. Romans 10:9 9 because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. JESUS CHRIST can come anytime! REPENT OF YOUR SINS Just Believe ❤️ Love you and GOD BLESS

[@murphygreen8484]

*255 divided by 10 is 25.5. If you can make an easy mistake pointing this out I think we can let him make a mistake while trying to talk on camera 😉

[@michealhall7776]

You probably just googled that

[@mrpancakes]

@@murphygreen8484 hahahahaha, watcha talkin about 😁

[@kirbofn524]

I think that not being able to devide 20 / 2 just because 20 is a i8 and 2 is a u8 is stupid. I get safety and all of that but still. That is stupid

[@CallousCoder]

Millenials and math 😂“I don’t know what 255 divided by 10 is but is 25 point something”. I was sitting It’s 25.5! .5!!! .5!!! 😅 Or perhaps it’s because he’s American and doesn’t use decimal system and therefore didn’t see it right away. Because in decimal system you just shift the comma. Anyways I find maths in Rust very unwieldy and you get very verbose formulas. Yesterday (hence I watched this video) I created a sine table creator for some Amiga demos I’m working on in Rust. And I was amazed that I couldn’t add an int to a float because in C that’s no problem not even with warnings all in. So I kept type casting looking at my formulas and was like: “this became utterly unreadable! Is there a better way?n And ended up here.

[@doropomegranate]

I miss javascript

[@MountainLabsYT]

255 / 10 = 25.5

[@genericbinary558]

I am ben tennision.

[@bifidoc]

this: ```rust fn main() { let x:u8=128; let z:u8=64; let y:u8=x+z+z; println!("{y}"); } ``` overflows in runtime 🤦‍♂

[@ryan80166]

finasteride and minoxidil

[@ЗубайрРахимов-щ7ы]

hi Tim How old are u ? i sad my teacher that u r 19 and he replies me "FALSE"

[@Hacker097]

Rust really leaves no room for ambiguity

[@tama3442]

*What is the Gospel?* The true gospel is the good news that God saves sinners. Man is by nature sinful and separated from God with no hope of remedying that situation. But God, by His power, provided the means of man’s redemption in the death, burial, and resurrection of the Savior, Jesus Christ. Ephesians 2:8-9 For it is by grace you have been saved through faith. And this is not your own doing; it is the gift of GOD, not a result of works, so that no one may boast. Romans 10:9 9 because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. JESUS CHRIST can come anytime! REPENT OF YOUR SINS Just Believe ❤️ Love you and GOD BLESS

[@NorteXGame]

And that, in my opinion, is good. It leaves you with opinionated code, which everyone can easily read.

[@webpapi]

python is far simpler w/less code :/

[@unitazer]

My brother in christ, python is a dynamic language, which means that it gets compiled into bytocode while being executed, which makes it EXTREMELY slow. This is basically c++ if it wasnt c--

[@Xylys]

how do you not know what 255 / 10 lol

[@tama3442]

*What is the Gospel?* The true gospel is the good news that God saves sinners. Man is by nature sinful and separated from God with no hope of remedying that situation. But God, by His power, provided the means of man’s redemption in the death, burial, and resurrection of the Savior, Jesus Christ. Ephesians 2:8-9 For it is by grace you have been saved through faith. And this is not your own doing; it is the gift of GOD, not a result of works, so that no one may boast. Romans 10:9 9 because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. JESUS CHRIST can come anytime! REPENT OF YOUR SINS Just Believe ❤️ Love you and GOD BLESS

[@dyspatch8574]

Are you Catholic or Orthodox?

[@ohwow2074]

Stop this $hit please

[@dyspatch8574]

@@ohwow2074 I know it's shit, I hate religion, but I asked this bot just to see if it's even responding to such comments.

[@JakkeJakobsen]

Oh my fucking God, please stop.

[@scottb4029]

God is Love. There is not fear in perfect love. 2nd Peter I believe or 2nd John.