The Big Programming Thread - Page 595

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Thread Rules
1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution.
2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20)
3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible.
4. Use [code] tags to format code blocks.

FFGenerations

7088 Posts

February 26 2015 06:54 GMT

#11881

OMFG I DONE IT SORT OF

FFGenerations

7088 Posts

February 26 2015 07:00 GMT

#11882

On February 26 2015 15:07 Blisse wrote:
the .get(ForecastResponse.class) isn't working, no clue why

just call .get(String.class) and it'll give a string object you can work with instead (unless it fails)

was trying to do something like this and got it to work with your encouragement coz i was giving up LOL

VaadinUI.java


package org.example;

import com.vaadin.annotations.Theme;
import com.vaadin.cdi.CDIUI;
import com.vaadin.data.Property;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.NativeSelect;
import com.vaadin.ui.UI;
import javax.inject.Inject;
import org.vaadin.maddon.label.Header;
import org.vaadin.maddon.layouts.MVerticalLayout;


/**
 * A simple example how to consume REST apis with JAX-RS and display that in 
 * a Vaadin UI.
 */
@CDIUI("")
@Theme("valo")
public class VaadinUI extends UI {

    @Inject
    JsonService service;
  
    @Override
    protected void init(VaadinRequest request) {

        setContent(new MVerticalLayout(
                        new Header(service.fetchMovie())));
                     
    }
}

JsonService.java


package org.example;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import org.example.domain.ForecastResponse;


/**
 */
@ApplicationScoped
public class JsonService {

    private Client client;
    private WebTarget target;

    @PostConstruct
    protected void init() {
        client = ClientBuilder.newClient();
        target = client.target("http://www.omdbapi.com");
         //target = client.target("http://cdn.animenewsnetwork.com/encyclopedia/api.xml");
    }

    public String fetchMovie() {
        //return target.queryParam("anime", "4658")
        return target.queryParam("i", "uuu")
                .request(MediaType.TEXT_HTML) //application_json or text_html or xml
                .get(String.class);
    }
}

solution to get it to work: just delete fucking everything

Manit0u

Poland17821 Posts

February 26 2015 08:53 GMT

#11883

On February 26 2015 15:17 nunez wrote:
can you really put a comment in the middle of chaining calls or is that just added after for clarity?

Most languages let you put comments in the middle of a chain.


my->long->chain->of->calls;

is equivalent to:

my
//->short
->long
->chain
->of
->calls;

and to:

my->/*short*/long->chain->of->calls;

A tested and working example:


class myClass {
	private $x = 0;
	
	public function f1()
	{
		$this->x += 1;
		
		return $this;
	}
	
	public function f2()
	{
		$this->x += 2;
		
		return $this;
	}
	
	public function f3()
	{
		$this->x += 3;
		
		return $this;
	}
	
	public function getX()
	{
		return $this->x;
	}
}

$myClass = new myClass();

$exload = $myClass->f1()->/*f2()*/f3()->getX();

echo $exload;
// returns: 4

Edit: I believe I misunderstood you. Were you asking of where to best put a comment?

Personally, with really long chains I'd put each call on separate line and add a comment after the call if necessary (this way it's clear which call are you commenting on).


my
->long
->chain // this might break, be careful!
->of
->calls;

Manit0u

Poland17821 Posts

February 26 2015 11:03 GMT

#11884

Was playing around with Towers of Hanoi algorithms:


class hanoi {
	public function move($n, $from, $to) {
		if ($n > 0) {
			$tmp = 6 - $from - $to;

			$this->move($n - 1, $from, $tmp);

			echo strval($from) . ' -> ' . strval($to) . ' : ';

			$this->move($n - 1, $tmp, $to);
		}
	}
}

$hanoi = new hanoi;
$hanoi->move(4, 1, 3);

Was fun.

nunez

Norway4003 Posts

February 26 2015 14:17 GMT

#11885

@manit0u
i was not aware that was possible until now!

Manit0u

Poland17821 Posts

February 26 2015 15:52 GMT

#11886

On February 26 2015 23:17 nunez wrote:
@manit0u
i was not aware that was possible until now!

Well, the compiler treats comments as blank space, so it doesn't really matter where you put them, as long as you don't obfuscate your own code too much with it.

Or you can use it to add some coolness to your code, something similar to this Pi calculating program:


#define _ -F<00||--F-OO--;
int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO()
{
            _-_-_-_
       _-_-_-_-_-_-_-_-_
    _-_-_-_-_-_-_-_-_-_-_-_
  _-_-_-_-_-_-_-_-_-_-_-_-_-_
 _-_-_-_-_-_-_-_-_-_-_-_-_-_-_
 _-_-_-_-_-_-_-_-_-_-_-_-_-_-_
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
 _-_-_-_-_-_-_-_-_-_-_-_-_-_-_
 _-_-_-_-_-_-_-_-_-_-_-_-_-_-_
  _-_-_-_-_-_-_-_-_-_-_-_-_-_
    _-_-_-_-_-_-_-_-_-_-_-_
        _-_-_-_-_-_-_-_
            _-_-_-_
}

+ Show Spoiler [compilation] +

gcc -traditional-cpp -o r r.c

or this flight simulator:


#include                                     <math.h>
#include                                   <sys/time.h>
#include                                   <X11/Xlib.h>
#include                                  <X11/keysym.h>
                                          double L ,o ,P
                                         ,_=dt,T,Z,D=1,d,
                                         s[999],E,h= 8,I,
                                         J,K,w[999],M,m,O
                                        ,n[999],j=33e-3,i=
                                        1E3,r,t, u,v ,W,S=
                                        74.5,l=221,X=7.26,
                                        a,B,A=32.2,c, F,H;
                                        int N,q, C, y,p,U;
                                       Window z; char f[52]
                                    ; GC k; main(){ Display*e=
 XOpenDisplay( 0); z=RootWindow(e,0); for (XSetForeground(e,k=XCreateGC (e,z,0,0),BlackPixel(e,0))
; scanf("%lf%lf%lf",y +n,w+y, y+s)+1; y ++); XSelectInput(e,z= XCreateSimpleWindow(e,z,0,0,400,400,
0,0,WhitePixel(e,0) ),KeyPressMask); for(XMapWindow(e,z); ; T=sin(O)){ struct timeval G={ 0,dt*1e6}
; K= cos(j); N=1e4; M+= H*_; Z=D*K; F+=_*P; r=E*K; W=cos( O); m=K*W; H=K*T; O+=D*_*F/ K+d/K*E*_; B=
sin(j); a=B*T*D-E*W; XClearWindow(e,z); t=T*E+ D*B*W; j+=d*_*D-_*F*E; P=W*E*B-T*D; for (o+=(I=D*W+E
*T*B,E*d/K *B+v+B/K*F*D)*_; p<y; ){ T=p[s]+i; E=c-p[w]; D=n[p]-L; K=D*m-B*T-H*E; if(p [n]+w[ p]+p[s
]== 0|K <fabs(W=T*r-I*E +D*P) |fabs(D=t *D+Z *T-a *E)> K)N=1e4; else{ q=W/K *4E2+2e2; C= 2E2+4e2/ K
 *D; N-1E4&& XDrawLine(e ,z,k,N ,U,q,C); N=q; U=C; } ++p; } L+=_* (X*t +P*M+m*l); T=X*X+ l*l+M *M;
  XDrawString(e,z,k ,20,380,f,17); D=v/l*15; i+=(B *l-M*r -X*Z)*_; for(; XPending(e); u *=CS!=N){
                                   XEvent z; XNextEvent(e ,&z);
                                       ++*((N=XLookupKeysym
                                         (&z.xkey,0))-IT?
                                         N-LT? UP-N?& E:&
                                         J:& u: &h); --*(
                                         DN -N? N-DT ?N==
                                         RT?&u: & W:&h:&J
                                          ); } m=15*F/l;
                                          c+=(I=M/ l,l*H
                                          +I*M+a*X)*_; H
                                          =A*r+v*X-F*l+(
                                          E=.1+X*4.9/l,t
                                          =T*m/32-I*T/24
                                           )/S; K=F*M+(
                                           h* 1e4/l-(T+
                                           E*5*T*E)/3e2
                                           )/S-X*d-B*A;
                                           a=2.63 /l*d;
                                           X+=( d*l-T/S
                                            *(.19*E +a
                                            *.64+J/1e3
                                            )-M* v +A*
                                            Z)*_; l +=
                                            K *_; W=d;
                                            sprintf(f,
                                            "%5d  %3d"
                                            "%7d",p =l
                                           /1.7,(C=9E3+
                              O*57.3)%0550,(int)i); d+=T*(.45-14/l*
                             X-a*130-J* .14)*_/125e2+F*_*v; P=(T*(47
                             *I-m* 52+E*94 *D-t*.38+u*.21*E) /1e2+W*
                             179*v)/2312; select(p=0,0,0,0,&G); v-=(
                              W*F-T*(.63*m-I*.086+m*E*19-D*25-.11*u
                               )/107e2)*_; D=cos(o); E=sin(o); } }

+ Show Spoiler [compilation] +

cc banks.c -o banks -DIT=XK_Page_Up -DDT=XK_Page_Down \
-DUP=XK_Up -DDN=XK_Down -DLT=XK_Left -DRT=XK_Right \
-DCS=XK_Return -Ddt=0.02 -lm -lX11 -L/usr/X11R6/lib

sabas123

Netherlands3122 Posts

February 26 2015 23:15 GMT

#11887

fuck this problem....

a loop is to short to be exucted.... wtfX_X

I had this problem when I was doing SDL_AddTImer in my project....

most anoying shit if seen so far like wtf....

http://pastebin.com/6rgmRuHY
http://imgur.com/5CTBjtI,9Hb44E9#1

nunez

Norway4003 Posts

February 26 2015 23:22 GMT

#11888

it's a bit unclear to me what you mean by works.

you wrote two infinite loops, that call printf "something" a finite number of times.

my guess is that you are wondering why the example with the smaller number does not show any console output, this is because the printf function is buffering the data. with the bigger number of times it eventually has to flush the data, because it does not have anymore room to buffer.

if you add a newline to the end of your string, it will force a flush, and you will see output in both examples.

sabas123

Netherlands3122 Posts

February 26 2015 23:24 GMT

#11889

On February 27 2015 08:22 nunez wrote:
it's a bit unclear to me what you mean by works.

you wrote two infinite loops, that call printf "something" a finite number of times.

my guess is that you are wondering why the first example does not show any console output, this is because the printf function is buffering the data. with the bigger number of times it eventually has to flush the data, because it does not have anymore room to buffer.

if you add a newline to the end of your string, it will force a flush, and you will see output in both examples.

aaahhh thank you,

that feels so unintuitive thou lol.

nunez

Norway4003 Posts

February 26 2015 23:27 GMT

#11890

it felt so unintuitive, from now on it will be the most natural thing in the world.

sabas123

Netherlands3122 Posts

February 26 2015 23:36 GMT

#11891

On February 27 2015 08:27 nunez wrote:
it felt so unintuitive, from now on it will be the most natural thing in the world.

haha ye.

anyway any idea how I can make my SDL_AddTimer work? so far the only time I got it to work was to put it in an ifinity loop and then hope it doesn't crash.

+ Show Spoiler +

Uint32 callback( Uint32 interval, void *p){
printf("something");
return 0;
}

int main (){
bool quit= false;
SDL_TimerID timer;
timer = SDL_AddTimer (6000 , callback , NULL);
while(!quit){
//to keep the programm running
}
return 0;
}

nunez

Norway4003 Posts

February 26 2015 23:41 GMT

#11892

what do you want to do with it?
here's a small example where the main thread spins on a boolean flag flipped by the callback,
as an alternative to infinite loop.

#include<cstdint>
#include<cstdio>
#include<SDL2/SDL.h>
#include<SDL2/SDL_timer.h>

uint32_t 
	callback(uint32_t interval,void* done_ptr)
{
	printf("library thread: in callback\n");
	printf("library thread: casting done_ptr to bool ptr and setting to true\n");
	*static_cast<bool*>(done_ptr)=true;
	return 0;
}

int 
	main()
{
	if(SDL_Init(SDL_INIT_TIMER)!=0)
		return 1;

	volatile bool done{false};
	uint32_t interval_ms{500};
	printf("main thread: adding timer\n");
	SDL_TimerID timer_id=SDL_AddTimer(interval_ms,callback,(void*)(&done));
	if(timer_id==0)
		return 1;

	printf("main thread: spinning while not done\n");
	while(!done);
	printf("main thread: done\n");
}

Ropid

Germany3557 Posts

February 27 2015 00:22 GMT

#11893

Does that example work? Will SDL_AddTimer() start a thread, or are you supposed to call some sort of "get new event" function, and in that polling thingy the timer callback will then be called if necessary, meaning there's no threads at all really?

nunez

Norway4003 Posts

February 27 2015 00:57 GMT

#11894

yes.
the callback is run on a separate thread created by the library.
(or that's what the SDL reference implies).

in the example on the sdl site (which i'm assuming you looked at),
the library thread communicates to the main thread by way of
adding an event to the sdl message queue, which the main thread
is blocked waiting for events on.

i used a boolean flag because i figured it was a simpler demonstration.

Manit0u

Poland17821 Posts

February 27 2015 01:12 GMT

#11895

Allow me to share my happiness with you.

Recently I've switched jobs. I've went from creating all sorts of websites to the company that only does SaaS, which was a nice thing in itself (less bullshit, more cool things, all projects done with the same framework instead of flipping through 4 or 5 of them etc.). The thing that made me realize it was a really good move was when on the first day of work I saw the internal server names used by the company:
- gitlab: drone
- jabber: zerg
- testing: templar
etc. etc.

At this point, I knew I'm home.

[image loading]

nunez

Norway4003 Posts

February 27 2015 01:16 GMT

#11896

aha, nice, and likely well deserved.

phar

United States1080 Posts

February 27 2015 02:16 GMT

#11897

Woah nvm browser out of date.

FFGenerations

7088 Posts

February 27 2015 02:36 GMT

#11898

On February 27 2015 10:12 Manit0u wrote:
Allow me to share my happiness with you.

Recently I've switched jobs. I've went from creating all sorts of websites to the company that only does SaaS, which was a nice thing in itself (less bullshit, more cool things, all projects done with the same framework instead of flipping through 4 or 5 of them etc.). The thing that made me realize it was a really good move was when on the first day of work I saw the internal server names used by the company:
- gitlab: drone
- jabber: zerg
- testing: templar
etc. etc.

At this point, I knew I'm home.

wow wtf that is godly

Blisse

Canada3710 Posts

February 27 2015 08:32 GMT

#11899

how do yall balance working with all the other stuff you wanna do?

i balance it by not sleeping but i feel like there's a better way...

Prillan

Sweden350 Posts

February 27 2015 08:34 GMT

#11900

On February 27 2015 17:32 Blisse wrote:
how do yall balance working with all the other stuff you wanna do?

i balance it by not sleeping but i feel like there's a better way...

I'll let you know when I figure it out.

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