/dpt/ - Daily Programming Thread

This retarded trap shit was always a fucking awful forced meme. It was 5 years ago, and it still is now.
Piss off.

He probably killed himself like every other trap.

Not sure what language, but I see what you're getting at. I think the 00 or 11 constructor for the list needs some sort of improvement to make it less obvious

Ah this brings me back

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desu seems reasonable to choose C just as a way to guarantee that there wont be any of the retarded shit from C++ like operator overloading

// pass 1: replacing boolean comparisons with logic
static bool ToggleBool(bool b) {
int[] ints = new int[] { !b ? 1 : 0, b ? 0 : 1 };
return ints.Sum() != ints.Aggregate(ints[0], (x, y) => x*y);
}

// pass 2: realizing there are only two cases here, b or !b,
// and splitting behavior for those two cases
static bool ToggleBool(bool b) {
if (b) {
int[] ints = new int[] { !b ? 1 : 0, b ? 0 : 1 };
return ints.Sum() != ints.Aggregate(ints[0], (x, y) => x*y);
} else {
int[] ints = new int[] { !b ? 1 : 0, b ? 0 : 1 };
return ints.Sum() != ints.Aggregate(ints[0], (x, y) => x*y);
}
}

// pass 3: replacing some bools in if clause and else clause
// with their known values based on which clause they're in
static bool ToggleBool(bool b) {
if (b) {
int[] ints = new int[] { 0, 0 };
return ints.Sum() != ints.Aggregate(0, (x, y) => x*y);
} else {
int[] ints = new int[] { 1, 1 };
return ints.Sum() != ints.Aggregate(1, (x, y) => x*y);
}
}

// pass 4: replacing arithmetic on known values with its result
static bool ToggleBool(bool b) {
if (b) {
int[] ints = new int[] { 0, 0 };
return 0 != 0;
} else {
int[] ints = new int[] { 1, 1 };
return 2 != 1;
}
}

// pass 5: replacing logic on known values with its result
// and getting rid of unused variables
static bool ToggleBool(bool b) {
if (b) {
return false;
} else {
return true;
}
}

// pass 6: there's a conditional that has no side effects
// and evaluates to a boolean,
// so we can replace the whole conditional
// with logic on the condition
static bool ToggleBool(bool b) {return !b;}

// pass 7: getting rid of redundant method declaration
!

For a given array A of N integers and a sequence S of N integers from the set {−1, 1}, we define val(A, S) as follows:

val(A, S) = |sum{ A[i]*S[i] for i = 0..N−1 }|

(Assume that the sum of zero elements equals zero.)

For a given array A, we are looking for such a sequence S that minimizes val(A,S).

Write a function:

def solution(A) #Python
int solution(vector &A); #C++
class Solution { public int solution(int[] A); } #Java

that, given an array A of N integers, computes the minimum value of val(A,S) from all possible values of val(A,S) for all possible sequences S of N integers from the set {−1, 1}.

For example, given array:

A[0] = 1
A[1] = 5
A[2] = 2
A[3] = -2
your function should return 0, since for S = [−1, 1, −1, 1], val(A, S) = 0, which is the minimum possible value.

Assume that:

N is an integer within the range [0..20,000];
each element of array A is an integer within the range [−100..100].
Complexity:

expected worst-case time complexity is O(N*max(abs(A))2);
expected worst-case space complexity is O(N+sum(abs(A))) (not counting the storage required for input arguments).

do your own homework

//pass 7: getting rid of redundant method body
static bool ToggleBool(bool b) => !b;

//pass 8: geting rid of redundant method
!

It's not homework:
app.codility.com/programmers/lessons/17-dynamic_programming/min_abs_sum/

I'm interested in programming but I have no idea what I would want to create. Or maybe I could set up servers/back-end or look into security. Should I give up?

I love those programmer pictures.

It is better than the retarded typename
varname[].
It can also be written as:
var ints = new int[] { ... };

or even
var ints = new[] { ... };

Hell..
int[] ints = { ... };

>but I have no idea what I would want to create
What about creating your own death by suicide?

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What language do I need to master to do that?

Do you think he's got a cute little anus, /dpt/?

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First learn haskell and then become a trap, death by suicide will come to you within a few weeks

I'm not exactly a C expert but are you expecting that to be given to your process by unix/the kernel?

If you write an extern and start using it, it will only work if it's defined with the same type somewhere else and they get linked together. Where are you expecting _iob to be defined?

I tried looking for that code in the K and R book but couldn't find _iob mentioned anywhere (or that file contents). Maybe I have a shitty edition or something. Sorry I can't be more help but I really only use C for embedded stuff.

I'm too ugly for step 2, that's why I shitpost anime

Sounds like you're dealing with bigger problems than me or "traps".
I've already learned a bit of C++ and I'll stick with that

Yeah it's kind of bizarre, people get so passionate about it. Big part of the reason the trapfags would post was for these reactions

>try to find program to download certain shit
>first program is a fancy C# one that insists on using an installer
>installer doesn't work on my PC
>no working binary of the standalone program
>try to compile from source
>needs C# 7
>follow instructions for getting C# 7 to work
>doesn't work
>find a command line program that does the same in Go
>doesn't build without being babysat
>random failures, seemingly out of order
>try to find out what's going on
>discover it's using Go routines for downloading so it launches 1,171 requests (not an exaggeration) simultaneously which inevitably time out and cause the program to bail out with an error
>disable Go routines so it does one request at a time
>works perfectly

Is this the power of fearless concurrency? I guess I'm going to mess around with this and tack things onto it until it works to my preferences.

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I love that manga

It is the power of falling for meme languages

>#Python
>#C++
>#Java
Ugh.
C++ it is then.
>val(A, S) = |sum{ A[i]*S[i] for i = 0..N-1 }|
so basically val(A, S) is |(sum of A's corresponding to positive A*S's) - (sum of A's corresponding to negative A*S's)|
>find minimum possible value for any sequence S
So we're pretty much trying to find the minimum absolute difference between the sums of the disjoint subsets in any binary partition of the absolute values of A.
In other words, let's say B = {abs(x): x in A}, and there exist disjoint subsets C and D of B.
Then we are trying to find the minimum possible value of abs(Sum(C) - Sum(D)) such that all these conditions are still met.
Given all that, it seems like an intuitive greedy solution would be something like this:
int solution(vector &A) {
// make all of A positive
for (auto &a: A) a = abs(a);
// sort A from greatest to least
sort(A.begin(), A.end(), [](a, b) {return a > b;});
// starting with the greatest and working down to the least,
// maintain two "pools" and add each element
// to whichever is smaller at the time
unsigned poolA = 0, poolB = 0;
for (auto a: A)
if (poolA < poolB) poolA += a;
else poolB += a;
// done
return abs(poolA - poolB);
}

I'm not sure if this solution actually fits within the complexity constraints or produces correct results, it's just what made the most sense to me.

Dumb Akarin poster

How do I get a programming job? What are the most in-demand languages and skills to have?

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>using windows

Forgot to put types in the lambda params.
Fixed that and made into a complete program.
#include
#include
#include
#include
using namespace std;
int solution(vector &A) {
// make all of A positive
for (auto &a: A) a = abs(a);
// sort A from greatest to least
sort(A.begin(), A.end(), [](auto a, auto b) {return a > b;});
// starting with the greatest and working down to the least,
// maintain two "pools" and add each element
// to whichever is smaller at the time
unsigned poolA = 0, poolB = 0;
for (auto a: A)
if (poolA < poolB) poolA += a;
else poolB += a;
// done
return abs(poolA - poolB);
}
int main() {
vector v {1, 5, 2, -2};
cout

I'm sure they're accepting merge requests if you care about doing something about it, whiny bitch

What exactly is the point of namespaces if "using namespace" is so frowned upon?
Also what do you think about function overloading?

because it makes things easier. if you absolutely know whats in the library your using and that you wont override it, you can use using namespace.
e.g. namespace simple {
using std::cout;
using std::endl;
}

using namespace simple;

cout

docs.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings#the-fixed-point-f-format-specifier
double Radius = millionsandbillions / carlsagan;
Console.WriteLine("Radius=" + Radius.ToString("F3", CultureInfo.InvariantCulture));
output is Radius=0.000
what am I doing wrong?

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why does clion give weird error syntax highlighting when doing commas between using? using xxx1, xxx2; yet it gives no syntax highlighting errors when declaring using on two different lines?
using xxx1;
using xxx2;

both compile fine and give valid outputs. see pic

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whoops. wrong pic. here is the correct one

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function overloading is retarded. just use templates.

is there a keyboard shortcut to wrap highlighted text in a code tag?

"using namespace" is what makes them pointless you dingus

If you have a milkshake.h
and I have a milkshake.h
and we both declare a straw()
and my straw() reaches acrooooss the default namespace, and collides with your milkshake.h
I
COLLIDE WITH
YOUR
MILKSHAKE.H
*compiler error noise*
I BREAK THE BUILD!

intreger/integer = integer
cast millionsandbillions to double.
probably ctrl+c?

Is it just me or are open source game engines written in C++ complete clusterfucks that are hard to install and even then, they just happen to not work? I'm thinking about Ogre 3D and Panda 3D now.

>"using namespace" is so frowned upon?
If you're talking about inside header files then the reason is because C++ linking is archaic and that leaks the namespace.

If you're talking about outside of header files than I believe you are confused.

>game engines
>complete clusterfucks

game engines are comlpex as fuck, so no, its not just you

Panda has horrible dependencies problem and Ogre uses cmake for configuration and it ends up in missing files, even after step-by-step installation. I would use Godot, but I wanted to have a motivation to learn C++ instead. On Windows I'd use Unreal engine, but I wanted to use GNU/Linux instead.

You can use C++ with Godot.

Friendly reminder to report all tranny OPs

Yeah, but it has this GDScript that I know I'd use all the time instead.

both the the other variables are also double, if I don't format the string output is a double in scientific notation

>If you're talking about outside of header files than I believe you are confused.
Not him but we had this conversation a few threads ago. Outside of headers it's still arguably harmful because you can cause collisions between namespaces that have the same symbols.
Not the biggest deal there ever was, though, since you can just explicitly disambiguate.

Probably not the right place to post.

I need to load a DLL in a .NET application. I'm getting a not very descriptive error when adding a reference to the DLL, and the DLL does not get added. I don't have the source of the DLL, it's proprietary and given to me by a company that has fucked up a lot of times in the past. This company gave me a set of 32 bit and 64 bit DLLs, I'm trying to load the 64 bit version of this 1 DLL in a 64 bit application, so my guess is that it's actually compiled for 32 bit and the morons at this company put it in the wrong folder.

How can I tell what bittedness a DLL was compiled for?

What happens if you do this?
namespace A {
using namespace B;
}

Is B joined into A instead of into the top level namespace?

Nvm

stackoverflow.com/questions/495244/how-can-i-test-a-windows-dll-file-to-determine-if-it-is-32-bit-or-64-bit

>arguably harmful
In some situations it's necessary for ADL to work, for example to_string() overloads & specializations.

Tinkered a bit with PyQT5, python-mpv, Psycopg2, PostgreSQL on Ubuntu "Bionic Beaver".

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yes. all of b's content is now only accesible through a.
so if you do - using namespace A - you can now access everything in B.

pls. what is this manga?

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It's called "neck yourself fag"

And using functions is arguably harmful because you might call the wrong one. Some misguided Jow Forums neophyte's bad opinions don't constitute something "being frowned upon."

If you're legitimately worried about namespace collision then your namespaces are probably way too big.

tyty, but what manga is it?

I want to learn c++ then algos, which books should I do/read? Programming Principles and Practice Using C++ > Algorithms (Sedgewick) or Algorithm Design Manual or CLRS?

why c++? try not to become too fixated on any one language.

I'd go with Programming principles and then CLR.

Not the guy you were replying to, but I want to learn C++ too, already know C# super well. I just want to know a flagship lower level language with object oriented features and C++ fits the bill.

meant to reply to

cuz oop. I won't become fixated in one language, thanks for caring about me tho, user

yea, guess that's the right route, thanks

here is the complete program
using System;
using System.Globalization;

namespace stargen
{
class Program
{
static void Main(string[] args)
{
Random rand = new Random();

while(true)
{
double seed = rand.NextDouble() * 49.5 + 0.5;
Star star = new Star(seed);
Console.Write(star.ToString());
Console.Read();
}
}
}
class Star
{
const double SolarMass = 1.989e30;//kg
const double SolarRadius = 695700;//km
const double SolarTemperature = 5778;//k
const double SolarSystemRadius = 86;//au, termination shock
public double Mass { get; }
public double SolarMasses { get; }
public double Radius { get; }
public double SolarRadii { get; }
public double Temperature { get; }
public double SystemRadius { get; }

//public List Planets { get; }
public Star(double mass)
{
Mass = mass * SolarMass;
SolarMasses = Mass / SolarMass;
Radius = Math.Pow(SolarMasses, 0.8);
SolarRadii = Radius / SolarRadius;
Temperature = SolarTemperature * Math.Pow(Math.Pow(SolarMasses, 2.5), 0.25);
SystemRadius = SolarSystemRadius * (Temperature/SolarTemperature);//just make shit up
}
public override string ToString()
{
String s = "Solar Masss="+ SolarMasses + "\n" +
"Solar Radii=" + SolarRadii.ToString() + "\n" +
"Solar Radii=" + SolarRadii.ToString("F3", CultureInfo.InvariantCulture) + "\n" +
"Temperature=" + Temperature + "\n" +
"System Radius=" + SystemRadius.ToString("F3", CultureInfo.InvariantCulture) +"\n"
;
return s;
}
}
}

what should I make, Jow Forums?

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A VN featuring your waifu

Simply distribute requests over a set count of blocking workers like here github.com/bakape/hydron/blob/master/fetch/fetch_tags.go#L50-L64

>python doesn't have switch
Can C unironically make better fizzbuzz code than python?

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Why the fuck would you be using switch for FizzBuzz?

you beautiful human being

dumb frogposter

doing the same thing to any other double produces expected results

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C++ does everything that C does, most things better, some things worse. And then it also does many things C doesn't do, but really, really badly. You, as a C++ developer, are expected by the community to use these terrible features, and not the genuine improvements over C.
And that's why C++ is awful.

>what are you working on
pic related
pastebin.com/kQWMUyUF

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I'm retarded, I had my division backwards, it was formatting a number that was almost 0

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#include
void fizzbuzz(void) {
for (int i = 1; i

I am learning Mercurial. Damn, why didn't I learn about DVCS before?

I have very little experience with HTML, but my interest is now mostly in microcontrollers and robotics, so I am looking for a good language to learn for that. What would Jow Forums recommend? I was told that Python would be a good language for my purposes, but I have no real idea. Thanks. Have some anime ass.

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>in microcontrollers and robotics
C and ASM

Python is good for that sort of thing sometimes. Depends on how micro your controllers are. If they're really really small / low spec / low power, you'll want to use a lightweight compiled language instead, e.g C.

Hey, thanks. I appreciate it. What book/web course would you recommend? I was going to buy "Learn Python the Hard Way", but I think I will learn C instead.

Oh shit, a femgoro poster here on Jow Forums.

Zed Shaw is a fucking hack, and everything he has written is garbage.

pick a modern C book.
ASM you can learn here software.intel.com/en-us/articles/introduction-to-x64-assembly

Namely what though.

I hate C++ for its syntax but I want genuine reasons to hate it.

Oh shit, Terry Davis is in the comments of that article from 2013.
>TempleOS identity-maps everything, all the time, so the usual convention of
upper memory being for kernel does not apply. It uses physical addresses,
basically.
>Terry A.D.

Kokuhaku it's right there

Just had an exam for this course I'm doing at University on Java. One of the questions was something along the lines of:
>Write a method that takes a two dimensional array, A, as an argument. The method will check if the array is a square (equal col/row) and return null if it is not square. If it is square, copy the contents diagonally to a new array, B.

For example if A = [{5, 4, 9}, {-2, 4, 1}, {4, 0. 0}] the returned array will be:
B = [5, 4, 0]

What's everyone's thoughts on this? we had to hand write it but I think i got it right, Nobody else that i talked to was confident that they did it correctly.

If you are iterating with (x, y) coordinates the diagonal is simply where x == y.

As for "is a square," how about `A.length > 0 && A.length == A[0].length`.