/prog/ - Programming

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

imageboard

reference manual (asm, c, wireless cards supported by linux, commodore computers) these have the bonus you might actually want to USE it later. a full z80 reference is not very hard to write but it takes some looking around. you can slap together a half-working z80 interpreter in like a week with just very basic c knowledge.

a gallery of high res vinyl album art scans/painting photography sorted by album ID/chronology and artist.

it sounds like you just need a framework so you can just put in empty todo pages instead of content and you're good to go.

>>5294

the prjects probably over, so whatd you do?

>>5278

HolyC used to be more like C, but due to the need for the language to work as the shell and the main programming language Terry had to modify the way the language was written. Think how he ones spoke about function pointers how he had to find a new way to represent them in HolyC because of the shell. Terry also wanted to use C as the shell because he never really learned the window batch files or the unix shell.

GCC for Terry had couple of problems

1. GPLv3

Originally terry had a loose idea of selling his OS.

2. JIT

As far as I am aweare GCC does not jit compile any languages..

3. The Size

The feature set of GCC very large and the way how most GNUproject software is written. Means that GCC would take up way too many lines of code and thus either fillup or excede the somewahat arbitrary LOC limit that Terry had. Also GCC has dependencies so those would have to be either ported or reimplemented.

4. Format

TempelOS uses a special fileformat that is somewhat similar to RTF called DolDoc. This is what enebles for the system to have a complex HyperText linking system and for the code to have embeded 3D models, sounds, images and so on. It would propably take a while to implement a proper parser for the format in GCC.

So is there any project to create a HolyC compiler for a platform other than TempleOS?

why is C 'holy'?

do you really think there are Divine things about C?

>>5341

There is a language called HolyC. It's similar to C and has a lot in common, but is not the same language.

>>5341

The name "HolyC" is a pun. Holy See is the governing body of the catholic church.

can someone explain ALL the uses for the -> operator?

i'm trying to learn OpenGL|ES 2.0 for the raspberry pi and don't really know what the fuck i'm doing besides reading K&R once and the code example here ( https://github.com/Apress/raspberry-pi-gpu-audio-video-prog/blob/master/EGL/window.c ) repeatedly uses the arrow operator from a struct to its members, whereas K&R and other resources I've found say it's only supposed to be used for a pointer to a struct to access members.

so for example, if you have a struct s and a pointer to struct s as ptr_s, and the struct has members x and y, what does s->x even do? shouldn't it only be s.x or ptr_s->x?

>>5286

nevermind, i'm an absolute nigger monkey. the naming conventions are just horrible in this code, it really is the struct's pointer being passed to a different function and then used with the same name as the main struct. global variables can swallow fat loads.

>>5167

digital mars has FIRE c++ compiler for windows... high recommend it. Everyone @ rockstar games uses it :)

GCC: GNU's C compiler, available for almost every platform, and popularly installed on Unix machines.

Digital Mars C/C++: The hackers at Digital Mars have a pretty rippin' C/C++ compiler for Windows that you can download and use for free, and that will work wonderfully for all the code presented in this guide. I highly recommend it.

VC++: Microsoft's Visual C++ for Windows. This is the standard that most Microsoft programmers use, and I freaking hate it. Nothing personal, but I'm one of those crazy people that still uses vi.

Turbo C: This is a classic compiler for MSDOS. It's downloadable for free, and I has a special place in my heart. (It can't handle the "//"-style comments, so they should all be converted to "/**/"-style.)

cc: Virtually every Unix system has a C compiler installed, and they're typically and merely named cc (C Compiler, see?) Just try it from the command line and see what happens!

>>5239

https://beej.us/guide/bgc/html/single/bgc.html

On Error Resume Next

God I fucking hate Visual Basic.

begin

writeln('Hello');

end.

program answer;

const pascal = shit;

begin

write('Pascal is ', pascal)

end.

>>2465

>>2467

>>2483

All of you faggots were never on the original /prog/.

Go to >>>/tech/ all of you.

>>4504

I'm not sure if you're telling them to go to tech to get educated, or as insult like you're exiling them

>>4593

>go to tech

>to get educated

That ain't happenin

>>4606

I suppose that depends on your level of knowledge / experience. It has certainly helped point me in the right direction (TOR/VPNs, GNU/Linux, FSF, /prog/, etc)

more textbrowser-friendly sites will go a long way toward reducing internet cancer levels

Their admin threw in the towel because he got bored of the site.

He gave a copy of the database to world4search.readsicp.org, I think.