The Nineteenth Byte

9:19 AM

1

This question wants you to golf batch programms. In Batch you can use set x=averylongbatchcommand %x% arg1 which expands to set x=averylongbatchcommand averylongbatchcommand arg1 Your task is it to expand these statements. As you can also use set for arithmetic purposes like this: set x ...

code-golf

New Main Posts

9:54 AM

-1

Q: Is there a way/service to mask a telephone number for calls?

I would like to know on how to give a person 1 (who cannot know the actual telephone number) a number that is not actually the real telephone number, but when he dials this number, in the background it will actually call the real number, so the person who's calling gets a generic number but it is...

sequence

ASCII-only

10:06 AM

@Sherlock9 Sorry, I force shut down during a system upgrade and had to figure out how to unbreak my laptop

@VTCAKAVSMoACE How is that even possible

Kevin Cruijssen

11:49 AM

@Dennis You've changed your avatar due to Halloween, or you just wanted a different color? ;)

ASCII-only

11:59 AM

@KevinCruijssen Halloween

New Main Posts

12:25 PM

1

Q: Advance to Boardwalk, If you pass Go, collect $200

Monopoly Board For this code-golf challenge we will be building the board game monopoly. Rules: Take no input. Output a 10x10 square where each ASCII character forming the square is the first letter of each space of the Monopoly Board. Go should start in the bottom right. Output the Monopoly B...

code-golf ascii-art kolmogorov-complexity

betseg

codegolf.stackexchange.com/a/96727/56721 (._.)

Kevin Cruijssen

@Dennis Thought so.
_ /_
/^,^\
\\__//

Ok, that ascii pumpkin kinda failed..

ASCII-only

@KevinCruijssen Put that in its own message, Ctrl+K

Kevin Cruijssen

 _/_
/^,^\
\\_//

New Sandboxed Posts

1:03 PM

0

A: Sandbox for Proposed Challenges

(Need a title.) Your task is to write up to 3 programs (or functions) that checks if the input is a string of balanced brackets satisfying the following criteria: The number of []s is always less than or equal to the number of ()s surrounding each position. The number of {}s is always less tha...

New Sandboxed Posts

1:14 PM

0

A: Sandbox for Proposed Challenges

Balanced triplet brackets A "triplet bracket" (that I made up for this challenge) is one of the following: (...+...) [...:...] {...|...} <...-...> A balanced triplet bracket string (BTBS for short) is either an empty string, two BTBSes concatenated, or one of the above triplet brackets with e...

betseg

1:44 PM

Tfw i don't have Flash and haven't really needed it for 4 months

Fatalize

2:10 PM

mfw someone uses "m/t-fw" without posting a face

Poke

maybe it was "that feel when"

to which I could respond "I know that feel, bro"

betseg

I love tf

(not Team Fortress, I love that feeling)

Fatalize

2:48 PM

TIL the Collatz conjecture has been proven according to this not-suspicious-at-all edit before the list of contents on the Wikipedia page.

Emigna

Interesting spelling on that edit

TimmyD

@Fatalize Totally not a virus. It's a dolphin.

Fatalize

Well it's a legit researchgate link

what is dubious is the content of the paper, given that no has heard of it and that it is shamelessy advertised on Wikipedia

TimmyD

Don't you know that only the best research from the best people gets published on the Internet? The Illuminati prevents their messages from being disseminated to regular people in the real world, in order to keep the lizard people a secret and ensure humanity's continual enslavement.

Emigna

Well, as long as the right Lizard rules...

New Sandboxed Posts

2:59 PM

0

A: Sandbox for Proposed Challenges

Monopoly Continued So you've got your Monopoly board, shall we start a game? To start with, we'll need some dice and to know where we land! Write a program that outputs the rolls and resting places of a given number players for a given number turns. Input In any suitable format for your lang...

Dmitry Kudriavtsev

3:33 PM

test

New Main Posts

3:45 PM

0

Q: Compute the Eulerian number

The Eulerian number A(n, m) is the number of permutations of [1, 2, ..., n] in which exactly m elements are greater than the previous element. These are also called rises. For example, if n = 3, there are 3! = 6 permutations of [1, 2, 3] 1 2 3 < < 2 elements are greater than the previous 1 3 2

code-golf math sequence combinatorics permutations

PhiNotPi

4:27 PM

Microsoft Onedrive's worst issue, by far, is that it doesn't allow me to download either a folder or multiple files at once: I have to do it one file at a time.

TimmyD

4:39 PM

@PhiNotPi Wha? I can multi-select. Just hit the checkbox.

PhiNotPi

Multi-select and download all at once?

TimmyD

Sure. It downloads it as a ZIP

PhiNotPi

That's odd... I remember seeing the download button disappear. There's a whole support forum post complaining about the lack of feature.

TimmyD

Huh. Granted, since I moved to Windows 10 around six months ago on my home laptop, I just access my OneDrive directly via Explorer, so I guess something could have changed.

PhiNotPi

I'm using the webpage interface.

Non-win-10 computer. Yeah the download button disappears when I multi-select.

Sherlock9

4:48 PM

@ASCII-only Ah, that's fine. I have assignments to do, but I'll try to let you know when I'll get back to work on that answer

TimmyD

@PhiNotPi answers.microsoft.com/en-us/msoffice/forum/all/…

MichaelMalloy- [O365]

about halfway down

Nathan Merrill

hey, I've got a function that returns true if its ordered smallest to largest, and false if its largest to smallest

what should the function be called?

it used to be isMaxOrdered(), but I think that's confusing

TimmyD

isAscending() ?

Dennis

What happens if the input isn't sorted at all?

Nathan Merrill

it always will be :)

TimmyD

4:54 PM

@Dennis isChaos()

Nathan Merrill

@TimmyD oh, this is exactly what I want :)

thanks :)

TimmyD

You're welcome!

TuxCopter

Hey

Sherlock9

@NathanMerrill What does it return if the input has a mixed order, like [4,2,3,1]?

Nathan Merrill

it won't

New Meta Posts

5:02 PM

0

Q: What's the Java policy with REPL existing?

An extension of When do I have to include things like Java's public static void main. Unless you've (probably) been living under a rock, you (probably) know that Java 9 is (probably) going to have a REPL interpreter ready for use now. This means that all the boilerplate code is no longer necessa...

discussion policy java

Nathan Merrill

that's one of the contracts of the class

it'll always be ordered :)

Sherlock9

Ah just saw that it was already asked. Was about to edit

At any rate, either isAscending() or isAscOrdered() may work

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Sieve of Eratosthenes, Step by Step Given a number N, draw a properly aligned NxN board of numbers, leaving 1 blank (as a space) (I will show diagrams with N=5) 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Your job is to construct the Sieve of Eratosthenes, step b...

TuxCopter

Question: Should a cast operator be right-assoc or left-assoc?

Fatalize

@NewMetaPosts WTF a Java REPL

TuxCopter

5:06 PM

@Fatalize It exists

an official one

I wanna see a C REPL

Yep ._.

(I know that doesn't make any sense)

TimmyD

@TuxCopter It seems like [cast]var is the convention. I can't think of a language that casts on the right

TuxCopter

5:06 PM

@TimmyD Cheddar for example

VSL is going to use :: as cast operator: 10::string

Fatalize

he's talking about a real language not Cheddar

TimmyD

Ouch

TuxCopter

R U SAYING CHEDDAR IS NO REAL ಠ_ಠ

Or string::10 idk for the syntax

^ this will be the syntax

I think right-assoc is better

Dennis

@DJMcMayhem I guess it's possible. Sounds like a neat project.

feersum

Pretty sure it exists.

TuxCopter

5:17 PM

@Dennis But it would be really slow

Martin Ender

gdb is basically a C REPL

Nathan Merrill

25

Q: Is there a REPL for C programming?

I am on osx. I found this http://neugierig.org/software/c-repl/ but the links on that page for code seem to be broken.

c read-eval-print-loop

TuxCopter

@MartinEnder More a machine code REPL

feersum

You can't define structs or functions in gdb AFAIK.

Dennis

@TuxCopter Who cares? You don't use the REPL for the final project, just for the bits you're testing without having to go through save-compile-run every time you make a change.

Martin Ender

5:18 PM

yeah it's somewhat limited, admittedly

Conor O'Brien

@DJMcMayhem I wanna C a C repl

TuxCopter

wathow

Bison reported me a reduce/reduce conflict

brb

Dennis

On an unrelated note, this bothers me every time I read/hear it.

By the way, the letters Ä, Ö, and Ü are called Umlaute (sound alterations), while the diacritic mark is called Trema, Umlautpunkte, or simply Pünktchen. Calling the diacritic mark itself umlaut in English is (sadly) commonplace, but this is wrong in German. — Dennis 5 mins ago

Conor O'Brien

is "diaeresis" a correct term for it?

Martin Ender

this is the first time I've heard "trema" in this context

Dennis

5:22 PM

@ConorO'Brien In English, yes. In German, it means something else entirely.

sighs

Conor O'Brien

._. one of a faux amis (false cognates), then

TimmyD

@Dennis But if you don't save-compile-run every time, how would you swordfight on chairs?

Dennis

I code alone. How would that go?

Conor O'Brien

you could pretend your arm is possessed.

TimmyD

It worked for Evil Dead

Conor O'Brien

5:26 PM

I think I'm just going to keep my screen in inverted mode until halloween is over :P

Dennis

@ConorO'Brien The problem here is that the dots are used differently in German. In most languages, they indicate the separation of the vowels in a diphthong, while ä,ö, and ü are entirely different letters in German.

Conor O'Brien

oh, I thought you meant the term diaeresis

TuxCopter

back

Dennis

@ConorO'Brien I do. In German, a Diäresis is what the dots do in other languages.

Conor O'Brien

@Dennis what I meant by that is that the term itself is used differently, i.e. has a different literal meaning in German. that is, "diaeresis" is a valid german word with a meaning distinct from that of english.

Poke

5:31 PM

@mınxomaτ this actually makes no sense >.>

Dennis

@ConorO'Brien Sort of. There's a Diäresis (but no Umlaut) in naïve, while there's an Umlaut (but no Diäresis) in Diäresis.

Is that confusing enough? :P

TuxCopter

wot

Conor O'Brien

I think I get it.

whoa I think I found a chat bug

DJMcMayhem

@Dennis Sort of. The nature of C and the concept of a REPL don't really mix that well

Conor O'Brien

or a userscript bug

DJMcMayhem

5:34 PM

The split?

Conor O'Brien

yeah

DJMcMayhem

I know that can happen if someone you've ignored says something between

Doesn't look like that happened here though

Conor O'Brien

yea

TimmyD

@Dennis Where were you a few days ago? :p chat.stackexchange.com/transcript/240?m=32973429#32973429

Nathan Merrill

@DJMcMayhem isn't that the nature of compiled languages and REPL?

Dennis

5:38 PM

@TimmyD Right there, apparently. Sorry.

TimmyD

@Dennis It's OK. I'll only hate you forever. ;-)

TuxCopter

lol

Poke

I love Java

try {
  return true;
} finally {
  return false;
}

TuxCopter

TimmyD

The island, the beverage, or the language?

TuxCopter

5:42 PM

o_O

Poke

Any guesses what that does

TimmyD

Complains that there's no catch?

Poke

well that's valid

TuxCopter

It returns true and anyway returns false

Poke

it does end up returning false

TuxCopter

5:43 PM

~~But since return exit the try-finally it return true~~ WAT

Conor O'Brien

@TuxCopter cannot repro

TuxCopter

@ConorO'Brien Now cat ran out of memory... that was a weird bug

Poke

eclipse even gives you a warning about it. something about "finally does not execute normally" or something

TimmyD

@Poke Oh, is the first return functioning like a break statement?

Conor O'Brien

`cat "#{`where cat`.chomp}"`

Poke

5:45 PM

I guess so? No idea how java handles that, haha

a nice SO post about it stackoverflow.com/questions/4185340/…

TuxCopter

Compiled from "Lol.java"
public class Lol {
  public Lol();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main(java.lang.String[]);
    Code:
       0: invokestatic  #2                  // Method hello:()Z
       3: pop
       4: return

  static boolean hello();
    Code:
       0: iconst_1
       1: istore_0
       2: iconst_0
       3: ireturn
       4: astore_1
       5: iconst_0
       6: ireturn

I don't speak JVM very well but I think it jump to the finally block after instruction 2 (Just before the return true)

TimmyD

@Poke Ah, that kinda makes sense.

quartata

Does anyone know where I can get a C-- compiler?

Can't find something that isn't a 404 anywhere

TuxCopter

Quick C--

It's on GH

Poke

Here's another fun one: System.out.println(Long.toHexString(0x100000000L + 0xcafebabe));

What does that print out?

quartata

5:54 PM

@TuxCopter It isn't?

TuxCopter

Wot

quartata

At least I can't find it. The only place I'm aware of that it exists was an old CVS server that appears to have 404'd

TimmyD

@Poke Probably something weird, because 0x100000000 is at the boundary of uint32

quartata

@TimmyD Yeah but it's a long

Poke

It is a long as quartata mentioned. (see the 'L' at the end)

TuxCopter

5:57 PM

s/a/as

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Classify Alternating Permutations An alternating permutation of [1, 2, 3, ..., n] is an arrangement such that each element is greater than or less than the previous element. There is a further distinction that an alternating permutation can be either UP or DOWN. For UP, this means that the alter...

TimmyD

Well, in PowerShell at least, you get cafebabe back -- "{0:x}"-f(0x100000000+0xcafebabe)

Poke

that's correct

although idk how powershell is doing the int vs long

at first glance you might expect 1cafebabe in java

since you know that the int is being upcasted to a long

however decimal ints are a little different than hex ints in java in that decimal ints are only positive

you need to use the unary "-" to get a negative decimal int

Shebang

@quartata The only thing I can find is a compiler that's no longer maintained: github.com/nrnrnr/qc--

Poke

when upcasting cafebabe you get sign extension

0xffffffffcafebabeL

Shebang

6:02 PM

"QC-- was retired in 2007 or thereabouts. If you have trouble building the compiler or using it, Norman Ramsey probably cannot help, but you can send email to ..."

Poke

thus the result is just cafebabe

Shebang

@mınxomaτ Code seems good to me: function isNotBatman

quartata

@Shebang Perfect, this is the compiler I was looking for

That's the "official" one

DJMcMayhem

Current band obsession: Starset.

TuxCopter

Quick C-- is effectively on GH, just not in the name Quick C-- ._.

Poke

6:25 PM

As a followup to the try-finally puzzle i mentioned earlier:

try {
  System.out.println("Hello");
  System.exit(0);
} finally {
  System.out.println("Goodbye");
}

What gets printed?

Yodle

I don't know why you say goodbye I say hello?

I think it prints both, but I don't remember for sure

Poke

It only prints "Hello"

Yodle

>.>

Poke

System.exit(0) halts thread execution

the jvm starts cleaning up

TuxCopter

Compiled from "Lol.java"
public class Lol {
  public Lol();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main(java.lang.String[]);
    Code:
       0: invokestatic  #2                  // Method hello:()V
       3: return

  static void hello();
    Code:
       0: getstatic     #3                  // Field java/lang/System.out:Ljava/io/PrintStream;
       3: ldc           #4                  // String Hello

Yeah it jump to the finally after executing exit

> Intramar, the French Navy computer network, was infected with Conficker on 15 January 2009. The network was subsequently quarantined, forcing aircraft at several airbases to be grounded because their flight plans could not be downloaded.[18]

ok

quartata

7:06 PM

@Geobits Does Marky maintain the state of the RNN cells or is it discarded after processing a sequence

If not that's probably a potential improvement to his "context" abilities

@TuxCopter What is this output from?

A tool to pretty print bytecode like that would be nice

TuxCopter

@quartata javap -c

TimmyD

@Poke PowerShell has strict casting, but it's very very loose on its conversions. You toss two things together and it'll happily try and mish-mash or re-cast or whatever to get it to work.

quartata

@TuxCopter Oh yeahhh I forgot about that

TimmyD

And for reference, the 0x is actually a special operator, not a type declaration. It takes a string input on the right consisting of [0-9a-fA-F] and interprets it as a hexadecimal number. It auto-upcasts the 0x100000000 to [int64].

Lembik

hi all

TimmyD

7:13 PM

Then, because the left-hand of the + operator is [int64], there's an implicit up-cast from the explicit [int32] that 0xcafebabe produced.

Lembik

I have a fastest-code suggestion.. How about computing the permanent?

TuxCopter

@Lembik hey :D

Lembik

hi @TuxCopter

quartata

@Lembik I was going to sandbox a code golf for that a while back but forgot

Poke

Do you have documentation for that? I thought it was just a way to define a hex literal

Lembik

7:14 PM

I haven't posed really hard challenge for ages :)

@quartata ooh interesting

@Poke en.wikipedia.org/wiki/Computing_the_permanent

assuming you were asking me

Poke

oh sorry

@TimmyD

Lembik

@quartata I think it's interesting as a fastest-code challenge as there isn't optimized code already out there as far as I can see

so it fits my criterion of being "almost useful" too :)

Nathan Merrill

@TimmyD isn't it a compile-time operator though?

feersum

I suppose optimized code for permanent wouldn't be very useful since it takes exponential time.

Poke

@TimmyD The regex would need to be a bit more complex than that since underscores are allowed in numbers too

feersum

7:16 PM

If you really optimized, maybe you could increase N by 2 or 3!

Poke

0xFF_EC_DE_5E is valid

TimmyD

@Poke Not in PowerShell.

quartata

The approximation algorithms are more interesting IMO

TimmyD

@NathanMerrill PowerShell is interpreted, but yeah.

Poke

Oh we're still talking about powershell? My bad >.<

I mean Java :D

TimmyD

7:18 PM

Others are e, as in 2e3 = 2000, and kb, mb, gb, tb, pb for powers-of-two ... like 64kb = 65536

Poke

that's neat

TimmyD

Yeah. It's come in handy in a couple spots golfing as a way to get a big number quickly. Like, 2gb-1 instead of 2147483647 or [int]::MaxValue

Poke

There's the classic -1>>>1

(in java)

TuxCopter

@Poke What

What does it do?

Poke

max int

TimmyD

7:23 PM

PowerShell it's -shl and -shr for bit-shift-left and bit-shift-right

None of this fancy << stuff

TuxCopter

Ah I tought it was a << >_<

feersum

Is shr arithmetic or logical?

TuxCopter

Arithmetic AFAIK

TimmyD

Yeah, arithmetic shifting

2-shl3 = 16

Conor O'Brien

7:39 PM

how does powershell differentiate that from 2 - shl3?

Yodle

Fun fact: C# doesn't have an unsigned right shift operator like >>> in java :[

Conor O'Brien

neither do ruby or python

feersum

Does it have unsigned integer types?

Poke

yes

Maltysen

@ConorO'Brien that's cuz integers are infinite length in pthon

Yodle

7:40 PM

Yeah you can do it with some casting, but it's not as nice as just >>>

feersum

Java only has that because there are no unsigned types.

Conor O'Brien

@Maltysen yeah ik

Poke

also yes

Yodle

Might as well not have the goes to operator either -->

3

Dmitry Kudriavtsev

@Maltysen And in Ruby

although there;s two types of integers, Fixnum and Bignum

Poke

7:43 PM

the goes to operator will always get a star in my book

@feersum Not exactly true. char is technically unsigned >.>

Geobits

Yeah, stupid char. Always having to cast for math :(

Poke

^ those 5 bytes add up

Geobits

Well you don't have to cast to do math, but you have to cast back to continue using it as a char. So six bytes :/

And that's if you don't need an extra set of parens, which you often do.

Yodle

So, if anyone was here yesterday, looks like I don't have to worry as much about the actual building of the PC. I just need to worry about the triple touchscreen monitor setup and how it will interface with it.

Poke

yes that's what i meant

@Yodle that makes a lot more sense

Geobits

7:46 PM

@Yodle Have it interface with frickin lasers.

Yodle

They had interest in using a display splitter, does anyone know if a splitter will be able to handle three seperate displays at once? All I can find are people claiming no from like 8 years ago.

Poke

why not just get a good graphics card

Geobits

^ that would be better

Yodle

@Poke No idea what kind of card will be in it now, they wanna use a pc we already have.

Geobits

Oh geez

Nathan Merrill

7:47 PM

just turned a 100 line class into a 5 line function :)

Conor O'Brien