The Nineteenth Byte

wat

21:01

@Pavel why

What's the reason for the block

Pavel

dk0 is social media and inexpensivecomputers is adult content. It's... weird.

wat

ADULT CONTENT.

It's a freaking computer store. WTF Filter.

Pavel

WTF indeed.

DJMcMayhem

I'm pretty sure it makes sense for a school to err on the side of too strict

wizzwizz4

My C code is segfaulting randomly. It uses windows.h calls.

Does anyone here know enough C to help?

wat

21:05

In other news "expertsexchange.com" used to be blocked at my school due to "transgender"

wizzwizz4

@Pavel Try HTTPS.

wat

I know that is the worst reason to block things but I can't figure out why it triggers that

Pavel

@wizzwizz4 Can't connect.

DJMcMayhem

@wat experts exchange --> expert sex change?

betseg

@wizzwizz4 explain "randomly"

wizzwizz4

21:07

@betseg Every time I try to run it.

I don't understand what the problem is.

DJMcMayhem

Do you know what line is causing it?

wizzwizz4

@DJMcMayhem Yeah.

DJMcMayhem

If it's segfaulting, you're probably dereferencing bad memory

wizzwizz4

I've got the relevant co -.

@DJMcMayhem I am.

But it shouldn't be bad memory.

It should be good memory, because I asked a Windows API for it.

DJMcMayhem

What's the API call?

wizzwizz4

21:09

(Actually, I just passed it by reference to a Windows API call).

@DJMcMayhem PeekNamedPipe.

Should I post the relevant code here?

It's just an excerpt.

DJMcMayhem

A couple lines are fine

wat

@DJMcMayhem oic

Pavel

How useful are Core Dumps when debugging?

Dennis

@AdmBorkBork Every part of your A program potentially reveals something about your B program. If they're very similar (i.e., if the edit distance is small), it's easier to figure out what B might be. With a larger A, the edit distance increases and less about B is known.

wizzwizz4

LPDWORD availbytes = 0;
PeekNamedPipe(pipein, NULL, 0, NULL, availbytes, NULL);
if (*availbytes) { // <----------- SEGFAULT?
    char byte;
    ReadFile(pipein, &byte, 1, NULL, NULL);
    printf("%c", byte);
}

@Pavel Very.

Pavel

21:10

I've never actually seen one before. I've only caused a segfault on TIO, and I didn't get a dump.

Jan Dvorak

that ... formatting ...

How did that happen?

Dennis

@AdmBorkBork I don't want to go into specifics since I already posted a cop (unaffected by this, A is so well golfed I actually edited another answer of mine to reuse part of the code).

wizzwizz4

@JanDvorak *shudder* Don't ask.

AdmBorkBork

wizzwizz secretly uses 1-space-width tabs

wizzwizz4

@AdmBorkBork Why would I do that?

I definitely do not use 8-space-width spaces.

@DJMcMayhem Posted.

ATaco

21:15

6

Pavel

^ Python programmer learns C++.

DJMcMayhem

@Pavel That's definitely not C++

Pavel

Isn't it?

AdmBorkBork

@Dennis Sure, I can kinda see what you're saying, but I think I'm not seeing it as big of an issue as you are. It seems like having a balancing act between making your code obfuscated (and thus harder to crack) or shorter (and thus a lower score if uncracked).

LliwTelracs

I have now been confused by one of the cop posts. They didn't show what environment they were using their javascript in. And using two different environments (repl.it and TIO) I managed to get two different cracks which don't work in the other environment...

wizzwizz4

21:16

You can onebox any image.

Jan Dvorak

That's Java

ATaco

That's most definitely java

betseg

9 mins ago, by DJMcMayhem

If it's segfaulting, you're probably dereferencing bad memory

Eh?

ATaco

If you ever find someone using this brace style, they're entitled to their opinion, but please take their tab key from them

Jan Dvorak

... or their house key

wizzwizz4

21:18

@betseg Looking up the memory value at an address that you're not allowed to access.

DJMcMayhem

@wizzwizz4 That if couldn't possibly cause a segfault. It's more likely ReadFile

wizzwizz4

@DJMcMayhem It is.

My compiler says it's there, and the ASM looks like a read.

betseg

@wizzwizz4 umm, I eh'd to say "well a deref causes the segfault"

wizzwizz4

@betseg Oh. I thought you were one of those newfangled programmers who can get around day-to-day activities without knowing what stdlib.h means.

Jan Dvorak

It's a C standard library header file. I know that much.

I think it defines malloc?

wizzwizz4

21:22

@JanDvorak github.com/schas002/yadfpl

Read it, and don't come back until you have. :-)

Oh, wait. It's not finished yet. You won't learn that from it. :-/

Jan Dvorak

I was wondering...

(and yes, I did use C until I abandoned it in favor of high-level languages)

betseg

@wizzwizz4 I meant segfault, and it's too late to edit now ;_;

Ducking autocorrect

ATaco

I feel you

Jan Dvorak

Are C/C++ and Assembly the only languages that let you segfault?

wizzwizz4

@JanDvorak No.

ATaco

21:25

Lua is my first language, but it's keywords make me berry sad

wizzwizz4

Any language lets you segfault if you break it hard enough.

Jan Dvorak

In C you don't even have to try

wizzwizz4

@JanDvorak printf(*NULL);

The compiler will get cross though.

ATaco

(Not some brainfuck derivatives)

It's probably possible in lua, but you'd have to make it really cross

wizzwizz4

@DJMcMayhem I found the problem.

I was setting it to a NULL pointer.

I don't know why.

DJMcMayhem

21:27

That would do it

ATaco

That'll do it

wizzwizz4

LPDWORD availbytes = 0; means "set to NULL" and not "set value at address to 0"? :-/

Christopher Peart

@Dennis sorry wasn't trying to come across as complaining. Just didn't know what was going on

DJMcMayhem

@wizzwizz4 Oh yeah. You want *LPDWORD availbytes = 0;

Jan Dvorak

I tried C on codewars. I was pretty delighted to learn about asprintf.

DJMcMayhem

21:28

Wait

wizzwizz4

@DJMcMayhem LPDWORD is already a pointer.

ATaco

7 imaginary internet points for whoever segfaults Lua

wizzwizz4

@ATaco Is there a question that we can answer?

DJMcMayhem

@wizzwizz4 is it a typedef?

wizzwizz4

@DJMcMayhem No clue.

ATaco

21:29

The segfault question would work

wizzwizz4

@DJMcMayhem unsigned long int *.

DJMcMayhem

So then you want LPDWORD availbytes; *availbytes = 0;

Jan Dvorak

You can use pointers to pointers to make jagged arrays

ATaco

34

Q: Shortest code that returns SIGSEGV

Write the shortest code that returns Segmentation Fault (SIGSEGV) in any programming language.

code-golf

DJMcMayhem

Wait no. Stop listening to me

wizzwizz4

21:29

@DJMcMayhem No, because it's NULL by default.

DJMcMayhem

And you want it to point to a zero?

Jan Dvorak

Yep, segfaults in C are pretty much the default :P — Paul Draper May 24 '14 at 23:23

ATaco

I'll put up a bounty for 100 rep when I get to a computer

I'd like to see lua break

DJMcMayhem

unsigned long int availbytes = 0;
PeekNamedPipe(pipein, NULL, 0, NULL, &availbytes, NULL);

@wizzwizz4 ^

wizzwizz4

@DJMcMayhem That's the smartest thing I've read all week.

betseg

21:32

Microsoft site says typedef LPDWORD *DWORD;

Wheat Wizard

@DJMcMayhem You were right the number of answers within distance 2 of () is 15

DJMcMayhem

Oh good

betseg

So DWORD availbytes = 0; ^^^

Wheat Wizard

There are also 26568 strings within distance of my cops answer that are balanced strings

DJMcMayhem

Does that mean you have a working solution?

wizzwizz4

21:34

@betseg Thanks. :-)

Now my code's Microsoft compliant.

DJMcMayhem

Also, that's pretty brute-forceable

Wheat Wizard

@DJMcMayhem I do

It takes like a minute to run though because it is very inneficient

betseg

Good night!

ATaco

Bounty deployed

TuxCopter

'night

Dennis

21:42

@ChristopherPeart Nothing wrong with complaining as long as you complain to me. ;)

Christopher Peart

Heh

Love jelly tho

So clear and concise

Malivil

No one truly knows Jelly. There are just varying levels of pretending. - 5h ago by DJMcMayhem

According to the sidebar anyway

Christopher Peart

I was there

I was the one who prompted it

Malivil

Ok

Christopher Peart

I asked if anyone knew jelly

5

Q: Find a balanced Neighborhood

Your task will be to take a balanced-string and a integer representing a Levenshtein distance (the number of characters that have to be inserted, deleted or changed to make one string into another) and you must find the number of balanced strings with that distance from the original string (i.e. ...

code-golf balanced-string

Can I get help understanding this @WheatWizard

DJMcMayhem

21:45

Do you understand levenshtein distance?

Wheat Wizard

@ChristopherPeart Sure! what is confusiong you.

Jan Dvorak

I have a jelly bean, though.

Christopher Peart

So I get the one string into another

but what string do we compare to?

DJMcMayhem

Start here: en.m.wikipedia.org/wiki/Levenshtein_distance

Christopher Peart

Oh wait

nvm

re read question now I understand

What I learned today kids is you should always make sure you read the question right!

Jan Dvorak

21:47

I understand the question - but I have no idea how to achieve the goal with any guise of efficiency

Christopher Peart

@JanDvorak Story of my life

Malivil

And the reason why I haven't tried to answer a challenge here yet...

Christopher Peart

I have an easy one

actually 2

one sec gonna pull em up

7

Q: Shortest Konami Code

The Problem You must write a program that, when the Konami Code is typed in during runtime, prints the string "+30 lives" and sounds a noise of your choice from the computer's speaker. Definition The "Konami Code" is defined as UUDDLRLRBA followed by pressing the enter key. The Rules You ma...

code-golf parsing keyboard

13

Q: Notcalc (Calculate the wrong answer)

Goal: Given two natural numbers (integers from 0 to infinity), output a number that is not the sum of those numbers, but is a natural number. Example solutions (TI-Basic): A+B+1 not(A+B) Invalid solutions: A+B-1 (for inputs 0,0, it returns -1, which cannot be a sum of natural numbers) "AB...

code-golf number arithmetic

Newly Featured Questions

35

Q: Shortest code that returns SIGSEGV

Write the shortest code that returns Segmentation Fault (SIGSEGV) in any programming language.

code-golf

Pavel

@NewlyFeaturedQuestions Is that a new chatbot?

Malivil

21:50

Thanks @ChristopherPeart, I'll try those out

Christopher Peart

@NewlyFeaturedQuestions help

Hmm

I guess no commands for it (expected)

AdmBorkBork

@Pavel It's been around for a while, but has only been fixed and started working correctly within the past couple of months.

DJMcMayhem

@Pavel It's an RSS feed

More info

AdmBorkBork

chat.stackexchange.com/rooms/info/240/…

DJMcMayhem

That's another thing that the RO's can control

New Main Posts

21:55

0

Q: Stable marriage problem

Background Suppose that there are 2*n people to be married, and suppose further that each person is attracted to exactly n other people under the constraints that: Attraction is symmetric; i.e. if person A is attracted to person B, then person B is attracted to person A. Attraction is antitran...

code-golf math combinatorics

Christopher Peart

22:05

"Wow this is easy!" Said no Jelly coder ever

Wait

WHAT DID YOU SAY?

ATaco

$x$ I'm trying to make a Chatjax Script.

Christopher Peart

oh

ATaco

It's not working.

Christopher Peart

I was starting to twitch

Removed comments before I see them really

ATaco

Auto-Chatjax is now working.

DJMcMayhem

22:14

@ATaco If you're experimenting with things/testing out a script, it would probably be best to keep in the sandbox

ATaco

I have nothing more I need to test.

DJMcMayhem

OK, that's fine then.

Stewie Griffin

Is this comment correct, regarding byte count in Desmos?

I think it's 20 bytes, since you're typing: (x^2+y^2-1)^3=x^2y^3...? Relevant meta post. — Stewie Griffin 2 mins ago

ATaco

My personal method is just copy it and count those bytes.

Christopher Peart

Attraction is symmetric Ha! — Luis Mendo 5 mins ago

ATaco

22:16

\sqrt{\frac{1}{3}^2}

Automatically Launch Chatjax for chat.se Userscript

Christopher Peart

What does it do?

Brainstorm time

ATaco

Runs the Chatjax script automatically.

Christopher Peart

Ideas for the name for my Language

Chatjax?

ATaco

What's the language?

LaTeX in chat.

Christopher Peart

@ATaco a new golf language i plan on making

ATaco

22:28

Any details about it?

Christopher Peart

Using the code page from jelly

Not the links one

Just the 257 unicode characters

muddyfish

@ChristopherPeart I'm still going for fluff

ATaco

Do you have a design concept other than a codepage..?

Pavel

22:47

@ATaco What's Chatjax?

ATaco

Let's you write Fancy math equations in chat

It's used over on Math.SE basically always.

$(b-a)+(f(b)-f(a))$ becomes latex.codecogs.com/gif.latex?(b-a)+(f(b)-f(a))

Pavel

Convenient.

Wait, I get it. It's Mathjax in chat.

ATaco

(I probably should have opened with that)

Christopher Peart

Ataco i am writing one up

ATaco

No individual defining concept?

I'm curious, I love language design.

(Backslashes aren't needed)

$x$

wat

22:58

$what is htis$

ATaco

But I think my script is broken.

It's not automatically updated.

Pavel

What's the point of removing a message that takes one line?

ATaco

TO THE SANDBOX!

wat

$(x-h)^{2} + (y-k)^{2} = r^{2}$

Christopher Peart

???

@DJMcMayhem canyou clean dis up

wat

22:59

@ATaco does that work

ATaco

(Not yet)

The script is bork.

Christopher Peart

@ATaco Tacit stack based language. <-- subject to change

DJMcMayhem

@ChristopherPeart uhhhhh maybe. It's hard to move messages from mobile

ATaco

Unborked.

Pavel

@ChristopherPeart Tacit stack based language. Not tacit based stack language.

ATaco

23:02

Isn't Tacit based and Stack based mutually exclusive?

Pavel

That is also correct to an extent.

Christopher Peart

Hehe

The results of the Tacit programming will be auto pushed to stack

Cyoce

Can't a stack language be tacit if you only do things to the stack and don't define variables?

DJMcMayhem

Yeah, I can only move one messages at a time from mobile. :/

Christopher Peart

Give me a minute to write what i mean

Cyoce

23:04

Tacit programming

Tacit programming, also called point-free style, is a programming paradigm in which function definitions do not identify the arguments (or "points") on which they operate. Instead the definitions merely compose other functions, among which are combinators that manipulate the arguments. Tacit programming is of theoretical interest, because the strict use of composition results in programs that are well adapted for equational reasoning. It is also the natural style of certain programming languages, including APL and its derivatives, and concatenative languages such as Forth. Despite this base, the...

Christopher Peart

It won't be full stack

wait

ATaco

You can do things to a stack, but that generally doesn't help it be golfy.

Christopher Peart

yeah

ATaco

Also, Updated Chatjax Userscript that actually works

Pavel

05AB1E is stack based.

DJMcMayhem

23:04

@Mego Could probably move them for you

Pavel

@ATaco pastebin is horrible.

Hastebin instead?

Christopher Peart

So I want to have it be tacit but with stack support

that way more options are availible

ATaco

Hastebin

Christopher Peart

Will eventually add support for basic code logic

If/else all that

Pavel

Thank you. Pastebin is laggy, full of ads, and when I try to copy anything it grabs the line numbers.

Christopher Peart

23:06

@Pavel Hit the raw button

Pavel

I shouldn't need to do that. Hastebin is easier for the person receiving the code and the person sending it.

And I'm not sure about Hastebin, but I know that pastebin uses cr lf line endings.

Christopher Peart

Welp

My sister pouted about me not doing a chore for her that she did for me today

We agreed that i would do it thursday

Now I don't have to do it cuz she pouted and this is awkward

Screw it going to go be nice and do it... and parent told me not to

mınxomaτ

@Pavel Gist > anything else. One can comment, fork and clone a snippet, there are no ads, and GitHub has an exponentially safer infrastructure than any anonymous *bin service.

Pavel

@mınxomaτ Right, if you're already signed into GitHub, use gist. Forgot about that.

Christopher Peart

sooo

Pavel

23:18

CMC: Given an input i, output the lowest value n>1 for which there is a solution to x^n=i, given x, n, and i are integers.

Christopher Peart

does .append add to an array in python? I think it does just want to make sure

Pavel

Yes, and they're called lists in Python.

Christopher Peart

ok thanks

Pavel

Note that appending a list to a list won't create a nested list, it will append each element of the second list in turn.

Maltysen

@Pavel even if you're not

you can make anonymous gists

Christopher Peart

23:21

Ok

Pavel

@Maltysen TIL

Maltysen

@Pavel that's incorrect

.extend() does what you said

.append() does create a nested list

Pavel

It's correct in at least one of Python 2/3

Christopher Peart

PSA: Always paste code with gist

ATaco

A Gist is probably a better idea.

Have a gist as well

Maltysen

23:24

@Pavel nope python2 python3

Pavel

But why did it break my code all those times..?

Maltysen

maybe you're thinking about +

Pavel

Right, probably.

ATaco

23:45

I made a Lua script that takes perfectly good Java and turns it into this:

As such, I have a new Code-golf challenge to write.

Rohan Jhunjhunwala

@ATaco please link me to this wonderful auto formatter

Christopher Peart

"Perfectly good Java"

4

Jan Dvorak

That's an oxymoron

ATaco

Running Lua 5.3

Other than the monster that is the righthand side of this code, it actually looks clean.

Jan Dvorak

I'd consider trying it on my Ruby code but it wouldn't do anything

ATaco

23:55

It might work with C++ as well.

And obviously it works with C#.

Rohan Jhunjhunwala

@ATaco thanks

Christopher Peart

@ATaco you wrote RProgN

right?

ATaco

Correct.

Christopher Peart

How did you deal with output. IE a program that has strings and ints

ATaco

Well, there's either the p function for explicit output.

Which just uses a tostring

Christopher Peart

23:57

ok

well i will go eat dinner then continue the work on my languge

Still need a name

The best ideas are !Jelly and Fluff

Transcript for