coral panther
Homework 8 - Objects and Data Encapsulation -
lunar kernelBOT
coral panther
Here's my code so far 🙂 ```#include <iostream>
using namespace std;
class student
{
private:
string first_name;
string last_name;
int id_number;
string subjects[3] = { Physics, Chemistry, Calculus };
int grades[3] = { 74, 63, 92 };
};```
Is it correct so far, and what should I do next??
simple shell
well, based on your list up there, the next steps are
- Create both accessor and modifier member functions to manage all data operations.
- Instantiate a STUDENT object.
- Initialize the data, change the data, and print the data using public member functions.
- Label the data that is printed.
coral panther
Yes! I’m not entirely sure how to create an accessor and modifier.
Could you provide me an example of accessor and modifier please
simple shell
i would assume that you discussed how to make getters/setters in class?
and yes, they will probably need to be public, otherwise they'd be quite useless
(tbf, getters/setters are generally bad practice, but well, looks like that's what your school is teaching you ^^)
coral panther
My professor provided his GitHub for objects but honestly, I’m still familiarizing myself with objects overall. I only really know the definition of ‘accessor and modifiers’ but beyond that, I don’t really know much.
I only started the topic of objects yesterday and it is quite confusing
Would you be willing to look at the GitHub?
simple shell
i'm not sure what i would see on that github
an accessor aka getter for a member is a function that just returns you the value of the member
and a modifier aka setter for a member is a function that lets you set the value of the member
coral panther
Oh on his GitHub, it’s his in class examples!
And I see. Do you have an example of an accessor and modifier. It doesn’t have to relate to my code, I just want to see an example and I’ll try to do the same and integrate it into my code.
coral panther
and a modifier aka setter for a member is a function that lets you set the value...
Oh yes! I’m aware of these definitions. Thank you for the reminder
lunar kernelBOT
@coral panther Has your question been resolved? If so, type !solved :)
coral panther
No!
simple shell
it's an example of a modifier and an accessor
do you not have any book or at least course notes or anything that actually teaches you this stuff?
or how are you expected to learn this?
coral panther
The way that I’m expected to really learn this stuff is learn his code given on GitHub
And do the assignment given to us
simple shell
wtf
coral panther
I mean, he provided definitions of it but frankly it’s a little tough to understand it with not much coding experience
Anyways, can you tell me which line shoes the accessor and modifier
simple shell
what do you think?
but seriously man, how on earth do they expect you to learn anything without proper instruction
like wtf
simple shell
this is seriously fucked up
they didn't provide you with at least a book you can read that will actually explain you the language? they just give you this github and tell you to learn it? with no further instruction?
coral panther
Well, he provides in class slides but again, it’s merely definitions.
And the physical examples are the GitHub
That’s why it’s tough.
simple shell
coral panther
But I assume line 46,53, etc. is an accessor?
simple shell
the get function gets the value, it's an accessor
the set function sets the value, it's a modifier
but like, do you even know what an int& is? or what member functions are? was any of that explained at all?
coral panther
Yeah! I learned it while doing my prior assignments
Int is integer
Member function is the . Thing
simple shell
man, i don't know how they expect you do this. this is bullshit. you should complain.
this teacher needs to be fired
seriously
they have no business teaching people
coral panther
I know a bit. I’m not great at it but I know a bit.
simple shell
man, the decline of the education system really is fucking sad
your school is failing you
i'm sorry about this
coral panther
I mean, it’s not my major sooo
coral panther
the get function gets the value, it's an accessor
So the accessor is line 46 and line 53 is the modifier?
simple shell
other way round
acessor gets you the value
modifier sets the value
note that in your case, you can just have it return the value
instead of using out parameters like this does
coral panther
Accessor is line 53, Modifer is line 46
simple shell
yes
coral panther
Ig my question is, what does it mean to ‘get’ or ‘set’ a value. Is setting a value initializing a value?
And getting a value is returning the valued
Value?*
simple shell
it means to get the value from the object and to set the value in the object
you use those functions if you need the value to do stuff
coral panther
Oh, I see.
simple shell
i'd also like to reiterate that this is complete bullshit malpractice and not how you actually want to program
but some people like doing this
you'll have to do it like this because your teacher tells you do
but just be aware that that's not how you actually write code
just in case you're planning to ever actually learn programming properly
coral panther
Hm okay!
My question now is what’s the difference between public and private. Like I know he told me to put all of this info in private but what exactly am I supposed to put in public
Bc you said I need a public thing to make the code work??
simple shell
private means it's only accessible by the class itself
public means it's accessible to anyone using the class
if you write code that does stuff with a student object, that code will be limited to using the public parts of the class
only code inside the class itself can access the private parts
chilly minnow
The way that I’m expected to really learn this stuff is learn his code given on ...
Let me guess, coding camp?
coral panther
So ig kind of like a web browser. The public part will be seen by everyone? And the private part will only be seen by a certain private group?
Or am I misunderstanding
Lol no it’s one of my required course for my physics degree.
chilly minnow
Ah. You should contact your university and let them know how horrible this class is and that there’s no actual teaching
Providing a GitHub and assignments is not a way to teach students
coral panther
😭 maybe you’re right
chilly minnow
I mean, sounds like you’ll still have to go through the class. But please do that either now or when you’re finished with the course
coral panther
I’ll do it at the end bc tbh I don’t want him to mess with my grade, yk?
But yeah it’s only 3 weeks left and then I’m done. I have some knowledge but I’ll be honest, most of it comes from discord servers like this
coral panther
So ig kind of like a web browser. The public part will be seen by everyone? And...
Anyways, is this correct???
simple shell
I’ll do it at the end bc tbh I don’t want him to mess with my grade, yk?
ofc
but if there's some anonymous course evaluation or smth, you should say something there
obviously be diplomatic and don't risk making yourself a target for retaliation
but if you can say smth, say smth
because this is bullshit
coral panther
Ofc I’ll do that
They do these anonymous course evaluations at the last week of classes, I’m going to poorly rate him
Anyways, I’m trying to continue my code but tbh I don’t know what to add in my public. I know I use set and get but idk set what or get what
warm urchin
Instructions on step 3 says, "Create both accessor and modifier member functions to manage all data operations."
Once you create a setter and getter for one, it's easy to do the rest
coral panther
Don’t I need to create a public first before adding the setter and getter?
warm urchin
yea, it's just
public:
//functions
private:
//data members
coral panther
Can you please give me examples of functions
warm urchin
look up setters and getters in c++
coral panther
oh
simple shell
well, for that they're doing, it's probably fine
warm urchin
oh alright
simple shell
you need to consider that they're just trying to pass this stupid course
they're not trying to actually learn good C++
and they're on a reasonably tight time limit
so dunno
if this video helps you understand some of the stuff going on in that code, that's fair enough imo
coral panther
oh, this isnt due until next wednesday.
simple shell
yeah but you're not gonna start C++ from scratch properly until next wednesday ^^
i certainly wouldn't recommend attempting that at least ^^
coral panther
i mean, tbh, when i have the time, maybe i'll learn it from scratch bc comp sci is interesting BUT rn i just dont have time
Im a double major soo
lunar kernelBOT
simple shell
^
coral panther
OH LOL i didnt know xcode or clion was a thing
I TRIED DOWNLOADING visual studios on my ma
mac
LMAO
simple shell
lol
coral panther
that's crazy to me, ty
anyways, i know its void set_function
but my problem is, what is the function
bc on the example, it was all based on time
void set time, get time, seconds, hr, minutes
but mine is based on the attributions of students
so should it be void_student???
simple shell
well, you have first name, last name, id, grade, etc.
you wanna get/set all of those
i suppose
simple shell
that's why you need the accessors/modifiers: so that you can get at those from outside the class
coral panther
in both i mean
using namespace std;
class student
{
private:
string first_name;
string last_name;
int id_number;
string subjects[3] = { Physics, Chemistry, Calculus };
int grades[3] = { 74, 63, 92 };
public:
void set_first_name;
void get_first_name;
void set_last_name;
void get_last_name;
void set_id_number;
void get_id_number;
void get_grades;
void set_grades;
void get_subjects;
void set_subjects;```is this correct so far
simple shell
well, functions are gonna need parameter lists
simple shell
no, like the parameters of it
maybe you should take a step back and look at some resources that explain the basics of functions and classes
it's gonna be hard to write this when you're not exactly familiar with the tools you're supposed to use
simple shell
um
yeah no, this just tells me that you have no idea what a function is. like at all ^^
which is fine
but you really need to learn that first
coral panther
this is what im looking at
like im creating a function called addition and then i initialize it
or is that wrong
simple shell
you're defining it.
not initializing it.
initialization is providing the initial value of something.
functions don't even have values.
they're not objects.
coral panther
oh i used the wrong terminology
my bad
so in the public funciton, is this where i define it?
simple shell
you can define it inside the class or outside the class
up to you
your teacher's code did it outside
but, again, i would highly recommend to check out some resources that explain classes and member functions.
just looking at example code is a terrible way to try to learn anything, let alone C++
the problem is that example code doesn't explain the actual principles behind how the language works, or the intention behind why the code looks like it does as opposed to some other way
coral panther
hm ok. how about this, ill try to learn more about it and then come back tomorrow with a better code.
or at least, watch videos and google it more
ig i need a background on function, and getters and settes
?
simple shell
on functions, classes, and member functions
and yes, then you can also look up getters and setters
coral panther
ok ill do that bc tbh im quite lost with what i have to do now
anyways, gn!! but ill try to learn it all by tmrw
Do you have any recommended links to learn??
simple shell
well, i'd recommend a good book
short-term learncpp.com is probably the next best thing
coral panther
Tysm
simple shell
it's not great but it might do