Personal notes: -Members are private by default -Classes allow us to group variables into a user-defined type and also add functionality to those variables
Coming from a C background and just learning C++, I have had so many people try to explain the concept of classes, but until watching your video I have never fully understood it. Thank you so much.
Using an adblocker will stop the Cherno from earning money from these videos, regardless of how smug and annoying the Udemy guy is I still choose to watch the adverts to support the Cherno.
Just came by to learn more from my University C++ class, and I got to say I love how your video is succinct and concise. No extra flowery wording, just straight to the point. But you do so in a way where we can understand, so you have that perfect sweet spot in teaching. Appreciate it, and I'm glad I came across your channel.
Or more simply, we can declare the move function inside the class and define it outside the class. class Player { public: int x, y; float speed; void Move(int xa, int ya); }; void Player::Move(int xa, int ya) { x += xa * speed; y += ya * speed; } int main(void) { Player player; player.x = 1, player.y = 2; player.speed = 3.4; player.Move(1, 2); }
I've been using python and golang but honestly I am going to use C++ from now on. Literally every video you have with a "new" concept just leave me thinking "Wow that's really cool", C++ seems like the perfect language.
If you're learning to code any of these are fine to learn in C++/C#/Python/Java/Javascript in my opinion. I would recommend playing around with a few of them just to get a feel for what you like. I wouldn't worry so much about "learning" the language, as much as learn to code, to start off because a lot of the basics/concepts are very similar. As one progresses it really depends on what is your path / end goal (use the right tool for the job). Each language is a tool, there are pluses and minuses to each. Personally would recommend Python/C#/Javascript to beginners because I think they are the most straight forward and have many branches and uses one can do particularly if you're not sure of your path.
A side note. If you were to print x or y in the state of the code at 8:03, you would get a completely unknown value. This is because, as he talked about in previous videos, when the variable is created it get assigned a memory address. We have no idea what previous data was in that memory address, it could be anything. Thus, if you print it without initializing it, most often, it will be a seemingly random integer value left over from the last variable (even from another program) that used it. As a result, ALWAYS initialize your variables people. ALWAYS.
Structs could have been mentioned as well in this video I guess, but not necessarily. Great job, as always! now to the other columns of OO programming! :)
C++ is called C++ because in C "++" was used to increase the value of variable by 1. So if C=1. C++ = 2. Which is to say, C++ is an incremented improved version of C.
it wasn't until I watched this video did I finally understand exactly why OOP is easier. thanks to juxtaposing the function straight to the class function.
Can't appreciate this series enough..excellent job...Best things is your videos aren't boring like other programming videos. Keep it up man. May god bless you.
I've done many hobby programming projects over the years and yet I've stuck with C and never used object oriented features. However I have seen this and other examples of how it can allow doing the same things I'm doing in a lot less code. I'm doing graphics programming and so an image class makes sense as each image will have its own pixel array and width and height.
C also has objects these are singular, structures, and arrays. Any of them could hold a pointer to a function and when u call a function through such a pointer that's exactly when things transition into OOP.
"there is nothing you can do with classes you couldn't do without them" Yeah, C is turing complete and doesn't have classes, but so is assembly or colouring squares on a piece of paper... Just because you could technically do all the same things doesn't mean that anyone on earth is actually capable of doing so :P
C still has things like structs, function pointers, etc. that can accomplish any OOP stuff in about the same amount of code. As opposed to, e.g. templates, which have no real correspondence with any C features.
There is one thing that classes do automatically for you that's quite hard and not fully achievable by C. And that's typesafety at compile time. You can typedef structs in C, but you can walk around the typecheck by accident or on purpose. C++ on the otherhand will always give you an compile error if you work with object's of different types, unless you provide a function or overwrite an operator that gives meaning to that combination of types.
C# is most certainly not just OO anymore its definitely well seated as a multi-paradigm language and has been for many years. With things like ReactiveX you have data-flow, with LINQ you have functional, both are those are heavily declarative but c# is obviously also heavily imperative, reactive is data driven but async/await sand the TPL is task driven, it has very mature reflection it can easily be written procedurally. It is basically the programming language equivalent of what English is to spoken language. It takes good ideas, finds really robust implementations and then improves on them.
Hey Cherno, trying to get back into the programming world, a few questions popped into my head : what do you think about Data Oriented Design (vs. Object Oriented) ? How effective can one use and understand DOD vs OOP ? or should i just stick to procedural kind of programming, that is, use C++ only where needed and mostly stick to C ? I want to be able to understand the computer and what it is doing for performance reasons. What s the speed difference in those applications between the two designs ? there s just not many resources around to poke into.
About C# being exclusively Object-Oriented - While it's true that C# was originally made to be an cleaner, object oriented alternative to Java, It's actually moving more and more to the functional paradigm in recent years, including borrowing many features from F#. Also I'm not a Java dev but pretty sure it also has Lambdas as of Java 8, though afaik on the JVM there are other languages much preferred for functional programming (Scala, Kotlin etc)
there are actually things u cant practically do without classes that is changing variables already assinged without rewriting the whole code so its technically possible to rewrite whole code but given that u dont wanna do that so u cant do it without classes
My notes: A class is a way to group data and or functionality together. We can use a class which contains all of our data into this one type. Our class needs to be a unique name. Variables that are made from class types are called objects and a new object variable is called an instance. Private and pubic is something that we can use in our classes, its main purpose is for visibility. Data and methods that are declared under public can be accessed outside of our class where as anything declared under private is the complete opposite, it can only be accessed inside of that class. Classes can contain functions, we call functions inside of a class a method. To conclude what a class is, it allows us to group variables together into a type and also add functionality to these variables (our private members). We essentially have data and have functions to manipulate this data. Anything that can be done with classes can be done without them, they make our life easier as a programmer and give us the ability to maintain code much better
I had a negative reaction to this vid in the first couple of seconds because I'm a superficial moron but I was a fanboy by the end. What a great explanation and high quality vid, impressive
I am making a game in which i am trying to keep my code tided up by using classes for every character but when it comes to two characters to interact i have problems accessing the other class
@LetMeSeeThemANKLES If you will confess with your mouth that Jesus is Lord, and believe in your heart that God raised him from the dead, you will be saved. (Injeel Sharif, Romans 10:9)
How can we do what you just wrote without classes? I mean, that's probably quite easy as it is a simple example. How would you actually do that though? Would that be possible by creating a global container that stores the player identifier key like in a , and then maybe associate x, y, speed with that key? How would we actually do that though with a map? I only learned it so far that you can associate 2 datatypes with each other, so let's say a string for the identifier, and then int for the x location. Or maybe even a map that associates a string key with a double vector? This vector could then hold x, y and speed. This way we could create various players inside our map and set x,y,speed independantly for each player. And then create some fuctions to perform transform operations on the player's position where we just need to input the playeridentifier key and displacement variables and it will automatically alter the vector content that responds to the identifierkey? I'll try this experiment now. But though, I can imagine if you would need to perform more complex algorithms on a certain custom datatype, it would be almost impossible to do that without having classes. Not impossible I believe, but just over the top unnecessary complex.
If you don't define a variable, it takes whatever value was in that block of memory. I believe that in some rare cases in debug, a certain predefined value is assigned automatically.
*Actually we need to pass Player instance in!* *But in C++ this chunk of the code gets inserted implicitly be the compiler.* For example in Python passing a handle of the instance, should be done explicitly in the code.
I love your series no you are great at explaining. However, I wanted to correct you by saying that the concepts of encapsulation, inheritance and polymorphism are possible in C. Therefore it is possible to have OOB in C. But of course it is very verbose so just use C++.
I can't stop looking at the chicken.....
same
i cant unsee that now...
lol I didn't even notice it
lol
the same here
3:43 'variables that are made from class types are called objects' this line just made everything so much easy. Thank you.
Agreed with you 100%
Each of these 10 minute videos teach me more than one class
fuck yeah.
No joke, I learned more in two videos 16min total than I did in my 2hr class
glad I'm not the only one
Professor Xing ain't got nothing on Cherno, Easy A for data structs. ;)
True, you can play videos faster on CZcams.
Never in my Uni days have I seen such a good youtube tutor. Clear, succinct and everything seems so much simpler
Personal notes:
-Members are private by default
-Classes allow us to group variables into a user-defined type and also add functionality to those variables
And those functions are called methods inside the classes.
Coming from a C background and just learning C++, I have had so many people try to explain the concept of classes, but until watching your video I have never fully understood it. Thank you so much.
same here, what a relief
I like the way you explain things: very simple, very fast and most importantly-nothing outside the topic. Thanks.
Soooooo.... Udemy ads keep playing on these videos telling me to sign up for a C++ course on there... Pfff, wrong place to advertise guys lmao.
Sure, because clearly you're going to learn a lot by using a single source, right?
Using an adblocker will stop the Cherno from earning money from these videos, regardless of how smug and annoying the Udemy guy is I still choose to watch the adverts to support the Cherno.
Timothy Jones Yup, it's the least we can do, if we can't support him on Patreon.
They are spamming me python and html, but i watch them anyway to help Cherno
@Gilpow, really dude... you take all of life so serious? @Dany na, I prefer to help him get those pennies that stack up from the ad views ;-)
Just came by to learn more from my University C++ class, and I got to say I love how your video is succinct and concise. No extra flowery wording, just straight to the point. But you do so in a way where we can understand, so you have that perfect sweet spot in teaching. Appreciate it, and I'm glad I came across your channel.
wrgg, no such thin gas extra or succx or concisx or point or etc, say, can say infix any nmw and any s perfect
@@zes3813 ??
I wish learning C++ was this easy. Having worked in C++ for 8 years in the past, it takes a long time to understand these concepts
*My takeaways:*
Class is a way to group data and functionalities together 0:55
looking for your comment and found it... I hope you have a summary of all the upcoming videos in the playlist.
Rasta Thanks, I did write summary for most videos in the playlist, but some of them are more complete than others :)
commenting for visibilty
Still waiting for that video on the back of a kangaroo!
I'm so glad you decided to ease up on the music, it makes it so much easier to concentrate on what you're saying.
Or more simply, we can declare the move function inside the class and define it outside the class.
class Player
{
public:
int x, y;
float speed;
void Move(int xa, int ya);
};
void Player::Move(int xa, int ya)
{
x += xa * speed;
y += ya * speed;
}
int main(void)
{
Player player;
player.x = 1,
player.y = 2;
player.speed = 3.4;
player.Move(1, 2);
}
1:42 "You can probably start to *C* that this is getting a little bit messy"
and that relates to how C doesn't have classes lmao
Cherno becomes teacher.
100% boys' attendance.
*200%* girls' attendance.
*H a n d s o m e*
Michael O'Connell if you count us it would be probably 500%
@@amndrkwe agreed
More like 110% boys attendance, I know I'd be auditing this course
Shadow clone no jitsu
Gaes: ( ͡° ͜ʖ ͡°)
Explained it quickly and clearly. Saved me a lot of time. Thanks!
This kind of format is definitely better for both teaching and learning.
This is the best explanation i've seen. every video/tutorial didn't help me. i tried for a few months but this is the only one i consider good
I've been using python and golang but honestly I am going to use C++ from now on.
Literally every video you have with a "new" concept just leave me thinking "Wow that's really cool", C++ seems like the perfect language.
Depends on what you want to do with C++.
If you're learning to code any of these are fine to learn in C++/C#/Python/Java/Javascript in my opinion. I would recommend playing around with a few of them just to get a feel for what you like. I wouldn't worry so much about "learning" the language, as much as learn to code, to start off because a lot of the basics/concepts are very similar. As one progresses it really depends on what is your path / end goal (use the right tool for the job). Each language is a tool, there are pluses and minuses to each. Personally would recommend Python/C#/Javascript to beginners because I think they are the most straight forward and have many branches and uses one can do particularly if you're not sure of your path.
A side note. If you were to print x or y in the state of the code at 8:03, you would get a completely unknown value.
This is because, as he talked about in previous videos, when the variable is created it get assigned a memory address.
We have no idea what previous data was in that memory address, it could be anything.
Thus, if you print it without initializing it, most often, it will be a seemingly random integer value left over from the last variable (even from another program) that used it.
As a result, ALWAYS initialize your variables people. ALWAYS.
This is like Roblox Studio Development where everything has a classname, with its own functions! Thanks for the tutorials! I am loving it!
Structs could have been mentioned as well in this video I guess, but not necessarily.
Great job, as always! now to the other columns of OO programming! :)
Wow, in 8 minutes you managed to teach me better than my actual cs teacher.
C++ is called C++ because in C "++" was used to increase the value of variable by 1. So if C=1. C++ = 2.
Which is to say, C++ is an incremented improved version of C.
@Artem Katerynych I forgot ++C was a thing
it wasn't until I watched this video did I finally understand exactly why OOP is easier. thanks to juxtaposing the function straight to the class function.
Can't appreciate this series enough..excellent job...Best things is your videos aren't boring like other programming videos. Keep it up man. May god bless you.
I've done many hobby programming projects over the years and yet I've stuck with C and never used object oriented features. However I have seen this and other examples of how it can allow doing the same things I'm doing in a lot less code. I'm doing graphics programming and so an image class makes sense as each image will have its own pixel array and width and height.
In 3 min you've explained classes better than anyone and with examples of references too kudos
you have a gift of explaining things precisely and without all the bullshit
C also has objects these are singular, structures, and arrays. Any of them could hold a pointer to a function and when u call a function through such a pointer that's exactly when things transition into OOP.
So a class is essentially a struct that can have functions.
@Artem Katerynych And Struct is in Stack andClasses in Heap
Even a struct can have functions.
Dude, your explanations are really impressive ... I like your KISS approach ...
I'm sure I'll recommend this course for a lot of people in the future! : D
These videos make these concepts so simple. I learn more from them than my professors lectures , and college c++ textook.
i like the way you are teaching people you are explaining everything in a higher speed you get the global vision of the subject instantly
"there is nothing you can do with classes you couldn't do without them" Yeah, C is turing complete and doesn't have classes, but so is assembly or colouring squares on a piece of paper... Just because you could technically do all the same things doesn't mean that anyone on earth is actually capable of doing so :P
C still has things like structs, function pointers, etc. that can accomplish any OOP stuff in about the same amount of code. As opposed to, e.g. templates, which have no real correspondence with any C features.
You can actually define classes in C. But why would you want to? It important to know in legacy codebases
( ͡° ͜ʖ ͡°)
It's always a relief to find somone that makes an impermiable thicket of jargon become meaningful.
Perfect!!!!! How could you explain so simple. I read and watched videos but this is the most understandable way of this topic. Thank you so much.
Thank you so much! Simple and to the point, yet has great explanations for the things he's doing. Nice work!
There is one thing that classes do automatically for you that's quite hard and not fully achievable by C. And that's typesafety at compile time. You can typedef structs in C, but you can walk around the typecheck by accident or on purpose. C++ on the otherhand will always give you an compile error if you work with object's of different types, unless you provide a function or overwrite an operator that gives meaning to that combination of types.
C# is most certainly not just OO anymore its definitely well seated as a multi-paradigm language and has been for many years. With things like ReactiveX you have data-flow, with LINQ you have functional, both are those are heavily declarative but c# is obviously also heavily imperative, reactive is data driven but async/await sand the TPL is task driven, it has very mature reflection it can easily be written procedurally.
It is basically the programming language equivalent of what English is to spoken language.
It takes good ideas, finds really robust implementations and then improves on them.
you are so good at explaining , thank you
Wow that was super simple and well explained. i think I'm gonna watch the whole series now lol
found your tutorials very useful, well done
Hey Cherno, trying to get back into the programming world, a few questions popped into my head : what do you think about Data Oriented Design (vs. Object Oriented) ?
How effective can one use and understand DOD vs OOP ? or should i just stick to procedural kind of programming, that is, use C++ only where needed and mostly stick to C ?
I want to be able to understand the computer and what it is doing for performance reasons. What s the speed difference in those applications between the two designs ?
there s just not many resources around to poke into.
youtube sucks, it didn't recommend your video, while I was actually learning c++, now it's again making things interesting!
thank u so much for providing this c++ series .
you are extremely coherent and i love it.
Very clear and understandable video with relevant examples. Thank you.
group the variable into a type and add functionality to those variables.
Commenting for your exposure. The best channel on CZcams for C++ !!!
me: oh so a class is to organize data ?
cherno: no... *sight* not data, its DADA
Nice example of POD (Plain Old Data) type.
this video really helped me understand Classes in C++ thanks cherno♥
Genius. Learned more in this than in one whole lecture with my awful professor
wow u actually simplified 24h of senseless lectures in 8 min.
MAN I LOVE THE CHERNO
Great lesson! Thank you!
About C# being exclusively Object-Oriented - While it's true that C# was originally made to be an cleaner, object oriented alternative to Java, It's actually moving more and more to the functional paradigm in recent years, including borrowing many features from F#.
Also I'm not a Java dev but pretty sure it also has Lambdas as of Java 8, though afaik on the JVM there are other languages much preferred for functional programming (Scala, Kotlin etc)
You just earned a sub.
my brain is exploding with understanding and I am very excited.
You kinda look like Luke Steele from Empire of the Sun, you even have the same nationality.
Keep up these golden tutorials man.
Any thought you have, to build up an episode relative with Polymorphism ?
if no, please ...
Please provide a lecture on Data Structure and Algoerithms pls pls
Classes are a way to group data and or functionality.
such a great video. i am beginner and i still understand all of the stuffs that you teach to us! Well done! Thanks :D
thanķ you sir....and godbless you...give all human education about and learn programming c++...thank you
there are actually things u cant practically do without classes that is changing variables already assinged without rewriting the whole code so its technically possible to rewrite whole code but given that u dont wanna do that so u cant do it without classes
Thank you for simplifying classes for me in c++
My notes:
A class is a way to group data and or functionality together. We can use a class which contains all of our data into this one type. Our class needs to be a unique name.
Variables that are made from class types are called objects and a new object variable is called an instance.
Private and pubic is something that we can use in our classes, its main purpose is for visibility. Data and methods that are declared under public can be accessed outside of our class where as anything declared under private is the complete opposite, it can only be accessed inside of that class.
Classes can contain functions, we call functions inside of a class a method.
To conclude what a class is, it allows us to group variables together into a type and also add functionality to these variables (our private members). We essentially have data and have functions to manipulate this data.
Anything that can be done with classes can be done without them, they make our life easier as a programmer and give us the ability to maintain code much better
use alt+ up arrow to move selected line up in case u dont know .(go to Edit > Advanced)
This vid is sooo helpful, so clear, so efficient ❤️
That hair is on point in every video.
wrrr
I had a negative reaction to this vid in the first couple of seconds because I'm a superficial moron but I was a fanboy by the end. What a great explanation and high quality vid, impressive
Thank you so much
I am making a game in which i am trying to keep my code tided up by using classes for every character but when it comes to two characters to interact i have problems accessing the other class
For a split second I thought there was a real chicken behind you just chillin there.
5:10 Can someone explain why did he take Player& player in move function as a one of the parameters.
it's nice to have a background music in the tutorials so that you don't feel sleepy ; P
Thanks for this great overview!!!
You sir, deserve more Subs.
didn't know that using &x will modify the actual value lol
i used pointers and...
ty
love you brother
u help a lot
May Allah bless you
Believe on the Lord Jesus Christ, and you will be saved, you and your household. (Injeel Sharif, Acts 16:31)
@@Stephen_Samuel actually no believe in God and you will go to heaven
Nigga cat
@LetMeSeeThemANKLES
If you will confess with your mouth that Jesus is Lord, and believe in your heart that God raised him from the dead, you will be saved. (Injeel Sharif, Romans 10:9)
@@Stephen_Samuel Ok let's just fck C++ for a moment. I just wanna know from whom/what am I going to be saved from.
Hey Cherno, you can't do this!!!
You are making C++ too easy.
"functions inside classes are called methods". OMG I've been using those words interchangeably this whole time! :o
Thank you
0:56 Thank you! Now I ca. Pay attention to what you are saying. 😹😹😹
I really hope 14 year-old me some 20 years ago watched this. I struggled so much back then with so little access to materials.
How can we do what you just wrote without classes? I mean, that's probably quite easy as it is a simple example. How would you actually do that though? Would that be possible by creating a global container that stores the player identifier key like in a , and then maybe associate x, y, speed with that key? How would we actually do that though with a map? I only learned it so far that you can associate 2 datatypes with each other, so let's say a string for the identifier, and then int for the x location. Or maybe even a map that associates a string key with a double vector? This vector could then hold x, y and speed. This way we could create various players inside our map and set x,y,speed independantly for each player. And then create some fuctions to perform transform operations on the player's position where we just need to input the playeridentifier key and displacement variables and it will automatically alter the vector content that responds to the identifierkey? I'll try this experiment now. But though, I can imagine if you would need to perform more complex algorithms on a certain custom datatype, it would be almost impossible to do that without having classes. Not impossible I believe, but just over the top unnecessary complex.
you missed explaining why speed is defined as 36918 int, where you're didn't define it inside your class, but thanks a lot for clearing this out!!
If you don't define a variable, it takes whatever value was in that block of memory. I believe that in some rare cases in debug, a certain predefined value is assigned automatically.
really helpful and resourceful.
Super helpful!!! Love your videos!!!!
*Actually we need to pass Player instance in!*
*But in C++ this chunk of the code gets inserted implicitly be the compiler.*
For example in Python passing a handle of the instance, should be done explicitly in the code.
I learned so much from this video, the confusion and worry I had is gone.
Wrong at 0:47. In C you have to create the whole mechanism. structs do it.
Isn't it called encapsulation when you put data and methods together using a class??
make video on data structure and design and analysis of algorithm
thank you
I love your series no you are great at explaining. However, I wanted to correct you by saying that the concepts of encapsulation, inheritance and polymorphism are possible in C. Therefore it is possible to have OOB in C. But of course it is very verbose so just use C++.