/prog/ - Programming

>>5425

In order to make use of domain specific features as matters of convenience and productivity. The theory of Turing completeness means that the functionality will be equivalent in the end. That doesn't mean that the programming effort to reach that point is equivalent.

>>5432

that's a fallacy.

as i already said same can be achieved with a library.

>>5315

>C's compiler technology is probably the most advanced of all

LOL. Fortran has been far ahead of C forever. They just finally got a major optimization into C compilers on par with Fortran and there are others.

IIRC they also got Common Lisp (CMUCL?) on par with Fortran for some numerical compilations ages ago and kept it for a little while.

No specific memory but I bet Java got up there pretty good.

I would say it's less safe because of the popularity of Python.

>>5399

Explain.

>>5400

I didn't give it much thought to be honest. Consider it a shitpost

>>5396

>not writing down your password

If you're writing a production-grade (what that means is up to you) password manager, you're going to want a rock-solid crypto library and a stack that you can ultimately trust. If Python provides that for you, then sure. You also have to consider the vulnerabilities and limitations of the programming language itself. You might also write a front-end in Python to a more secure (read: low-level) back-end, but then you have to deal with vulnerabilities at the language barrier and in any kind of RPC system you might use if you're not doing everything locally. I'd just stick with a low-level language like C, C++, or Rust. Something like Go should be relatively fine too for a personal-use password manager.

java

yes

>>4349

>java

It's shit. Start with something like Python, Ruby or Scheme/Racket instead. After that, try C/C++ to get a slightly better understanding of how the machine works.

I would learn Java, though getting old. It's easy to learn and the main bulding blocks of the language are found in any other programming language. Furthermore it's quite similar to C#. But If you want to get a job you have to dive deeper in the ecosystem. Learn Frameworks, stuff like gradle, maybe kotlin. Do some research if you want to find a job. But Java is a good startibg point.

>>4350

Yeah it isn't the best. But the learning curve is high. And Python has a more distinct syntax which makes the transition between languages harder if you're a beginner. Ruby. Is good for web programming. If you want to go into that field, but then sure go for Ruby. C++ in my opinion is just too much if you're starting out. The language has too much to offer. As i said above. Start with Java, do some Job research and then make transition.

>>4350

>java is shit

>try python, ruby

modern languages with the beginners charm fall apart quickly when you move to advanced stuff.

start with c/c++ , then java.

what are some comfy systems to learn assembly for if you want to start from nothing like Terry and build something akin to an os? like easy basic graphics/hardware interfaces in assembly. i guess i could go for a ti-84 but i want something more featured, preferably better than a c64 but that's probably getting into graphics accelerators and i have no idea what i'm doing.

again i have no idea what i'm doing or what i want since i'd also want a system with a good emulator so i dont have to pay an arm and a leg. i guess i'm stuck with a ti-84 in reality. the c64 emulators i tried wouldnt even run BASIC commands so i dont think that's the way to go. just jumping into x86 or A64 (i have a rpi) seems like trying to learn to swim by diving in lava.

should i just focus on C and not give a shit about assembly?

>>5457

MIPS is popular for learning, it's relatively simple but had actual hardware.

>>5458

thanks, i'll take a look

>>5457

Learn RISC-V.

MIT's entire 6.004 class is open sourced, including the lectures which are all on YouTube https://6004.mit.edu/web/spring19/resources/lectures

You can buy these chips for next to nothing, and program them from the ground up yourself. A hardware hacker's dream. India and some other countries are working on a total replacement for ARM using RISC-V. Learn it now and get in on that action if it ever happens.

>>5454

WASM right now is just a MVP, meaning minimal viable product so it's missing tons of features. You need to jerryrig a lot of things to get it to work.

That said, when it finally is a real prototype, you will be able to compile WASM binaries in any language and yes it will likely eat the world as we know it where your browser merely pushes a binary and all those web app stores are obsolete. In fact almost everything will be obsolete because they want native resource access in the final prototype meaning an application that is just pushed through your browser and has native access to everything including your video card in order to render graphics. Programs like Windows Word or whatever will be this type of binary, fully owned by a remote company and just lended to you through a binary push. We're entering a radically different style of computation where RMS was essentially correct, the bulk of computation will be done remotely on closed source ecosystems and just pushed to you through a dumb terminal.

Hey, I'm learning Python, specifically Python 3.6. I came across an issue involving tuples, specifically with:

tuple.index(x)

Whenever x is a variable defined by an input, it gives me a value error saying it is not in the tuple. Is there some work-around?

I can provide the original code and error message as needed.

>>50378

if i remember then input is a string and needs to be convertet to an int if you want to use it with index

>>5378

https://docs.python.org/3/library/stdtypes.html#index-19

"""8. index raises ValueError when x is not found in s. Not all implementations support passing the additional arguments i and j. These arguments allow efficient searching of subsections of the sequence. Passing the extra arguments is roughly equivalent to using s[i:j].index(x), only without copying any data and with the returned index being relative to the start of the sequence rather than the start of the slice."""

While this is poor design, it is documented behavior. The workaround is:

>>> import operator
>>> import functools
>>> def seqindex (seq, item):
...    return next (
...       map       (operator.itemgetter (0),
...       filter    (operator.itemgetter (1),
...       enumerate (
...       map       (functools.partial (operator.eq, item),
...       seq)))), -1)
... 
>>> seqindex ((1, 2, 3), 3)
2
>>> seqindex ((1, 2, 3), 4)
-1
>>> 

>>5378

OP here, fixed the code, works fine now. I appreciate the help.

>>5378

Was it a type thing? Did you have a tuple with integers in it, nad were trying to find the index using a string variable?

It would be nice if this place was more active, since the start of this year /tech/ has been filled with /g/-types who can't program and instead shit up the board with consumerist shit.

>>5311

I feel you. /tech/ was already filled with idiots beforehand, but it's gotten really bad recently. For what it's worth, I'm monitoring this board. Just start a thread about something you want to talk about.

>>5434

>Can we just get the standard board font here? This is unreadable.

--

Deleted meta thread. Any other opinions on the above? I can change the font to something else or let it be the default if it's annoying. Would a monospace font be interesting?

I find the font easy to read. However, could it be possible to wrap each post around a square or a line that separates from the post above? it would make reading a lot easier.

>>5439

Sounds straightforward enough, I added a faint line above replies.

8chan is a piece of shit though so the change may not be visible yet.

>>5430

Then GNU is not Unix-derived because it is an independent implementation of Unix that wasn't derived from any Unix heritage.

>>5431

"Unix-derived" referred to the design, not the source.

>GNU

>>5433

To be Unix means having a lineage from the old versions of Unix which was actually built from the source code. To be Unix-like is to reimplement the Unix system in a clean room implementation.

>>5437

Thanks for lecturing me on what my own words meant, clearly I wouldn't know that myself.

>>5438

No worries friend, happy to be of help.

I'm classified for the regional competition of the acm. Didn't try the other ones.

For real life it's more useful to just work on projects, but I believe learning to solve hard problems on comp. prog. sites really does give you some form of divine intellect.

It's probably most useful if you're a researcher in algorithms or something.

I've done some of this.

Anybody interested here's a good resource: https://contest.cs.cmu.edu/295/s19/

If you're American join the USACO Training program https://train.usaco.org/usacogate it's probably the best training to go from beginner -> strong competitor.

Topcoder and all that junk, I never bothered with. The only thing you should be doing on Topcoder is claiming bounty's for writing features (this is how Topcoder works, they post a feature they need, you write it, they give you the bounty). The actual online competition and whatever is meh, you should physically enroll in a competition if you're truly interested and build a team.

>>4430

There's utility in experiencing different software requirements. I'm an experienced programmer that's spent much time writing business software. I've recently started learning about game programming and I've picked up many kinds of techniques and lessons that I can apply for my work in business software.

https://spit.mixtape.moe/view/a58b07a8

Why the unexpected behavior here? Instead of segfaulting it "fails" silently. Please excuse my lack of understanding here.

>>5300

        #include <iostream>
        using namespace std;
         
        void swap(int * p, int * q){
           int temp;
           temp = *p;
           *p = *q;
           *q = temp;  
           cout << "Hello" << endl; //this is the unexpected behavior point; cout does not work if int is passed to int* but it also doesn't just crash or not compile; why the unexpected behavior?
        }
         
        int main(){
           int c = 5;
           int d = 10;
           swap (c, d); // this should be swap(&c, &d) yet this DOES swap the values but does not cout as expected or segfault
           cout << "c is set to: " << c << endl;
           cout << "d is set to: " << d << endl;
           return 0;
        }

It's because you are not calling swap, you are calling

std::swap

#include <iostream>

using namespace std;

std

swap

swap

std::swap

swap

See https://en.cppreference.com/w/cpp/algoritPost too long. Click here to view the full text.

>>5305

>>5300

You can prove this to yourself by deleting your swap function, the code still does the same thing.

>>5305

I swear, everytime I see a post like this, C++ is involved. But seriously I think this explains why "using namespace std;" is a bad idea. Beware of what you make implicit.

>>5320

>everytime I see a post like this, C++ is involved

this is a mistake even easier to make in C anon, as you and anon just demonstrated. The value semantics of good C++ as (opposed to anon's C-with-classes code) eliminates this issue. For example, this behaves as anon expected and calls his fubar version instead.

#include <iostream>

void swap(int a, int b) {
  // fubar
}

int main() {
  using namespace std;
  int a{1}, b{2};
  cout << a << b << '\n';
  swap(a, b);
  cout << a << b << '\n';
}

I am doing the GET through an AJAX call which gets activate onClick.

>>4564

var options = {

url : '',

method : 'GET',

strictSSL : false

};

>>4564

Your application should proxy the requests to avoid that.

>>5327

honestly this. Many linters will give you a warning that you have too many local variables, and it's true. Local variables are helpers, and they should be set directly before they are being used. If you have a bunch of local variables, either use class/static parameters directly or split up the function. You probably don't need all 16 variables for the same thing, and if you do, put them in an array or something.

>>5343

this so much this. CS niggers in college will try to follow rules and make their code "super-readable". Newsflash: no code is readable. You just have to make is the most understandable, and even that will take a lot of rewrites before you find that yes, this way is the most optimal way of solving the problem at hand. So just do what seems right, get the functionality, and then review and see if you can make sense of the code.

>So redpill me on the variable question. Logically declaring it right before needing it seems like the best thing to do.

Yes, this is best. It's not 1981 any more so we don't need to carry on antiquated practices that were required for the limited memory of the day.

>>5324

Just declare them so that the program can be maximally readable to all the people that are working on the code. If it's just you, then do what's most convenient to you.

It doesn't always make sense to put everything on top.

If say I need a temp variable that I'm only gonna use in a "for" then I'll create that variable on top of that "for" that way everyone knows that that variable is only really used there.

Keep your mouth shut and listen for the most part. If someone suggests you to do it a certain way, do it and then show it to them they'll appreciate it.

Also the redhead is obviously the hottest one

>>5388

Thanks, it's obvious but important.

>>5389

Oh, she is.

>snake oil

hadoop?

Apply a map to an image. This is an awesome example of SIMD computing.

Anything that's isomorphic to the above example is also a good example, and there are a lot of those.

>>4597

This free CMU book will show you all the algorithms and data structures that can benefit from being run in parallel http://www.parallel-algorithms-book.com/ which is a ton of things

It's certainly not snake oil OP. With multi-core cpus if you don't program intentionally to take advantage of them, then you are leaving a metric shitton of perf on the table. This is currently the best book on the subject in general so I'm shilling it for now.

https://www.manning.com/books/c-plus-plus-concurrency-in-action-second-edition

>t. own this myself

how the hell is it snake oil? its insanely useful. never read the book in your image but parallelism and concurrency are important concepts to know