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Search - "double pointers"
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What is a pointer?
A descriptive and ELI5 answer found on Reddit:
You have a house.
When you’re outside, and you want to go home, you don’t make another house right where you are, because it’s too big for you to carry around or take apart.
So you carry a piece of paper or store on your phone the address of your house. Now you always know exactly how to find your house so that you can go home.
The piece of paper or your phone is a variable.
The variable contains an address (a reference) to your house.
You can make a copy of this piece of paper and hand it out to your friends when you invite them over, instead of building each friend a copy of your house.
You can have an address book filled with pages, where each page is an address (i.e., an array of pointers). Each page you turn (each index you increment) goes to the directly next address-containing variable.
Now if you cut the address book in half along its height, and then attach the lower half behind the upper half, then you have a book with smaller pages but more pages.
You can store phone numbers in this, and even if it’s the same total size, you have double the number of pages and double the number of phone numbers (if you store one number on each page).
Now, since the pointers to home-addresses are different from pointers to phone-numbers, turning the page in an address book (increment pointer by 1) moves forward by one address.
But turning the page in the phone book (incrementing pointer by 1) leads you to the next phone number, even if you technically turned only “half a page”.
That’s how pointer arithmetic works.
Source: https://reddit.com/r/...8 -
I was getting a freelancer job to do some backend work for a company in India that is working for a huge company in Saudi Arabia.
The customer in india was my primary contact, I wasn't allowed to talk to the guys in Saudi Arabia. My contact, we'll call him Aman, asks if i can do frontend too. I decline. Now what follows were 4 weeks of backend work during which Aman called me 10-15 times per day via skype to ask me how I was progressing, and if "insert spec here" was already done. He even called me in the middle of the night, well aware of the different time zones.
But in the end all the work is done, Aman is happy. I request payment.
Aman: We can't pay you yet, you didn't do the frontend!
Me: I'm not doing frontend.
Aman: It's just a few simple changes and then we're done.
Me: Gnnn, fuck it, what do you need?
Aman: Our customer would like the frontend to look better.
Me: Ok, so what exactly should look better?
Aman: All of it.
Me: Do you have any specs?
Aman: No just make it look more modern.
Me: So you want me to rework the whole frontend? That's not just a few simple changes...
Aman: How long would you need?
Me: I actually don't do that kind of work.
Aman: We pay you double your hourly rate if you do this and finish it fast.
(This is were I should have just said no... but the greed...)
Me: Ok, but it will take me about 3 weeks to do that.
Aman: OK.
Me: Do you have any preferences as to how it should look?
Aman: No, just surprise us.
(After this sentence I really should have gotten the hell out of Dodge)
After working 3 weeks changing over 20.000 lines of CSS and most of the HTML I present Aman with the changes.
Aman: No our customer doesn't like the changes. Can you make a different version?
Me: What doesn't he like, any specifics, coloring, styling of lists or the buttons?
Aman: He doesn't like the whole thing. Please make us another version.
Me: Ok, you are the customer, but it would really help if you give me some pointers as to how it should look like.
Aman: Just do your best.
Me: ..., ok, that's helpful.
2 weeks later...
Aman: No our customer liked the version before better. But could you make it look more modern.
Me: *Bangs head against wall repeatedly*
Me: What do you mean by modern?
Aman: It should look more modern, as a whole.
Me: Ok, I get that, but could you give me an example?
Aman: Sends me a screenshot of the overview screen with all the elements encircled and modern written beside them.
1 week later...
Aman: The customer has decided, he likes the original version best. Can you undo all the changes?
Me: Sure but that'll take like 1 hour.
Aman: Oh by the way we were asked by accounting why the price for this project was so high?
Me: *hugh* *gnn* what?
Aman: Well at the beginning, you estimated the backend and frontend work to be done in 4 weeks.
Me: The frontend was never part of the original estimate.
Aman: Can you do anything concerning your hourly rate, so that we can get back to the original pricing.
Me: *make a mental note to never work with an intermediary company in india again and cancels the job requesting the due payment*
Luckily I got paid the full amount but not before having another 10 Skype call with Aman...17 -
The GashlyCode Tinies
A is for Amy whose malloc was one byte short
B is for Basil who used a quadratic sort
C is for Chuck who checked floats for equality
D is for Desmond who double-freed memory
E is for Ed whose exceptions weren’t handled
F is for Franny whose stack pointers dangled
G is for Glenda whose reads and writes raced
H is for Hans who forgot the base case
I is for Ivan who did not initialize
J is for Jenny who did not know Least Surprise
K is for Kate whose inheritance depth might shock
L is for Larry who never released a lock
M is for Meg who used negatives as unsigned
N is for Ned with behavior left undefined
O is for Olive whose index was off by one
P is for Pat who ignored buffer overrun
Q is for Quentin whose numbers had overflows
R is for Rhoda whose code made the rep exposed
S is for Sam who skipped retesting after wait()
T is for Tom who lacked TCP_NODELAY
U is for Una whose functions were most verbose
V is for Vic who subtracted when floats were close
W is for Winnie who aliased arguments
X is for Xerxes who thought type casts made good sense
Y is for Yorick whose interface was too wide
Z is for Zack in whose code nulls were often spied
- Andrew Myers4 -
We were in a c class learning about pointers, the teacher was doing small stars on the board to explain the basics of them.
After a short while we all understood, or so we taught.
Someone asked about double pointers, so the teacher put 2 stars on the board to explain. THEN THE IDIOT OF THE CLASS GOES AND BLOODY ASKS IF WE COULD REPLACE THE 2 STARS BY A BIG ONE.
I MEAN OF COURSE JUST PUT A STAR EMOJI TO MAKE A DOUBLE POINTER.
The legend still lives on as he got kicked for an unknown reason🤔.3 -
So we had a guy who spend decade in automotive, flight simulation and stuff. C mostly. Lasted only a month of his probation period. Didn't seem to know about double pointers. Maybe coding standards in automotive even discourage them...
But made me wonder how to judge skills. - I tend do be on the cautious side, as I hadn't really understood inheritance and many basic things when I started. But luckily my first boss believed in me, saw me gnawing through (Well about my 'initiation' that'd be others stories to tell). Well, guy was hired as a 'senior', so they expected bit more. Dunno, still feel a bit strange about it, even if I ranted about his chattering before, coz he also had his heart in the right spot, but maybe it's for the best anyway...
But guess who's taking his place in our team! Drumroll.. Yes, Mr gitmaster is. -
First and foremost, students should be carefully taught the logic and mentality behind programming. Most of the time I see that the introductory programming courses waste so much energy in teaching the language itself. So students kinda just get fucked cause many people end up ending the course without having actually gained the "programming perspective".
Stop teaching pointers and lambdas and even leave the object oriented stiff till later. If a student doesn't know why we use a For loop then how can they learn anything else.
I believe once that thing in your brain clicks about programming, everything goes smooth from there... kinda :P
Second of all, and this pertains mainly to the engineering and science disciplines.
We need a fundamental and strong mathematical foundation. And no I don't mean taking fucking double integrals. Teach us Linear Algebra, Graph theory, the properties of matrices, and Probability theory.
One of the things I suffered from most and regret in university is having a weak foundation in math and having to spend more time catching myself up to speed.
It's so annoying reading a paper on a new algorithm or method and feeling like an idiot because I can't understand what magic these people did.
Numerical Methods...
Ok this is more deeper, maybe a 2nd year course.
But this is something we take for granted.
Computers don't magically add and subtract and multiply.
They fuck up.
And it'll bite you in the ass if you're not even aware that the computer we all love so much isn't as perfect as we think
Some hardware knowledge.
Probably a basic embedded systems course with arduinos
just so you can get a feel for how our beautiful software actually makes those electrons go weeeeeeeee
And finally
Practice practice
Projects projects
like honestly
just give me the internet and some projects
Ill learn everything else
Projects are the best motivation
I hate this purely theoretical approach
where we memorize or read code and write these stupid exams
Test what we are capable off
make us do projects that take sleepless nights and litres of coffee
And judge our methods, documentation, team work, and output
Team work skills and tools (VCS, communicating, project management, etc.)
Documentation and Reporting
Properly
:)
maybe even with LaTeX :D
Yeah that's the gist of whats on my mind at the moment regarding an ideal computer science education
At least the foundations
The rest I leave it to the next dude.