The Nineteenth Byte

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Number Basher

00:54

How do you check for negatives in brainfuck
I remember seeing something

OldSandboxPosts

Sandbox posts last active a week ago: Sum of a range of a sum of a range of a sum of a range of a sum of a range of ..., Counting black and white piano keys

Rydwolf Programs

01:24

@NumberBasher One approach could be zigzagging up and down from the number until you hit zero, and seeing if it takes an even or odd number of iterations

Bubbler

sounds like testing for (unsigned) x >= 128 would work

Rydwolf Programs

Oh, I'm assuming infinite Int size

Bubbler

yeah that's surely harder

1 hour later…

Jo King

02:46

@NumberBasher check if the first char of input is a dash?

Number Basher

@RydwolfPrograms how exactly though

@RydwolfPrograms yah this is what I'm assuming

@JoKing unbounded int on tape

Jo King

use another cell to store a counter, alternate between add, subtract, subtract, add, increment counter, repeat until that hits zero at some point

Number Basher

03:05

how exactly

ive been struggling for 2hrs on this lol

mousetail

Just insert as many "-" symbols as the ASCII code for the negative sign

Number Basher

no the number is not input, it is stored in the tape

assume no Int limit

mousetail

I don't think that's possible

You could do it if you had 2 copies of the number, so you could increment one and decrement the other

Number Basher

@JoKing we need help

Jo King

03:25

without testing, something like [>+[>+<<->-]>+<<[>]>[<+<+>>-]<<] ?

x=0
while n:
 x+=1
 n-=x
 if n==0: print('pos'); break
 x+=1
 n+=x
else:
 print('neg')

Number Basher

04:02

How does this I/O work im confused

mousetail

04:26

Doesn't seem to be any io

Bubbler

How do you even copy a signed unbounded int in bf

Number Basher

05:11

idk

JoKing

@JoKing thank you but we're still confused

@JoKing

Jo King

what's confusing

with that code, i'm assuming the input is already on the tape

there, i edited the python code of the algorithm to output the sign

given it only adds/subtracts positive values, it should work in unbounded signed int bf

Number Basher

05:29

no so like for the bf code what is the output? tape pointer?

Jo King

05:54

@NumberBasher yes, either the pointer is on cell zero for negative, or cell -1 for positive

Number Basher

06:09

oh ok

let me test this out

@JoKing wait what is our initial position

Jo King

with whatever value on cell zero, with some clear cells to either side (-1 through 2)

Number Basher

is there a way to keep the original number though

Bubbler

do all the same operations done to n on another cell with + and - flipped

when n becomes 0, the other cell will be n

Number Basher

oh true im just stupid thank you

wait but which operations are done to n?

Bubbler

06:25

n-=x, n+=x

Number Basher

wdym

for this [>+[>+<<->-]>+<<[>]>[<+<+>>-]<<] which are done to the original number?

Bubbler

idk lol

Jo King

i mean, x also ends up as the absolute value of n*2 if you need it

3 hours later…

New Posts

09:34

Q: Draw the initial positions of Mölkky pins in ASCII art

Write a function (or a whole program) that outputs (or prints) an ASCII art of the initial position of Mölkky pins. Output : __ __ __ __(07)__(09)__(08)__ (05)__(11)__(12)__(06) | (03)__(10)__(04) | | | (01) (02) | | |__| | | | | |__| |__| |__| |__| |__| |__| R...

mousetail

10:21

Can someone smarter than me please explain the joke: thecodelesscode.com/case/114

Dannyu NDos

10:36

I don't get it either

unicode.org/charts/PDF/UFFF0.pdf

This is what I think by "special characters".

Bbrk24

11:36

The "Rejoin favorite chatrooms" userscript isn't working for me; is it having problems for anyone else?

3 hours later…

Seggan - On Strike

14:09

@mousetail don't get it either

Rydwolf Programs

14:45

@Bbrk24 Isn't that a built-in feature?

Bbrk24

No, the userscript puts the button back when you're already in multiple rooms (though it's smaller, it looks like a link rather than a fancy button)

Rydwolf Programs

@JoKing Can't you also do add-increment-subtract-increment?

That would be simpler and should still visit everything

2 hours later…

DLosc

16:47

I wish "rejoin favorite rooms" didn't include frozen rooms.

l4m2

Any way to use repeat notation but each repeat is on different key?

Bbrk24

Not that I'm aware of

l4m2

On movable key notation they can just write "2nd repeat: 1=bA; 3rd repeat: 1=A"

mousetail

Maybe ask in the music chatroom?

RubenVerg

17:13

@l4m2 just write (repeat in X key) or (repeat N half-tones shifted up) above the repeat sign or something

mousetail

You have to write it in Italian

l4m2

Is it good to write "bbb(####)" key?

RubenVerg

(ripetere in chiave di X) (ripetere N mezzi toni più acuto)

the only reason I like being italian is not struggling to read music

l4m2

For question that require to draw staff, is it good to require using the unicode char to avoid argument "what count as a head"?

mousetail

17:30

Staff?

3 hours later…

user

20:40

@mousetail Music

Simd

21:13

Is there any free software to do ocr on a page of handwritten notes?

user

Yes

If you have PowerToys, then you can install the OCR module for your language

Probably tons of websites out there for it too

DLosc

Man, living in the future is wild

Simd

21:29

@user I will have to look up power toys!

Does piclkle.load(open(“file.pkl”, “rb”)) close the file afterwards?

Bubbler

22:27

@Simd I doubt it does that

user

22:44

Yeah, it'd be weird

There's also tons of examples out there using with, which wouldn't be necessary if pickle.load closed the file

lyxal

22:58

@DLosc this made me think of the sentence "man living in the future is tight!"

To which my response was wow wow wow wow wow wow

user

Which man is that?

Perhaps someone should tell him to loosen up

lyxal

@user a producer guy

@user only if it is super easy, barely an inconvenience

user

I have a feeling these are Breaking Bad references but I have no idea what you're talking about

lyxal

Actually it's Pitch Meetings :p

youtube.com/@PitchMeetings

Neil

23:25

@DannyuNDos they probably just meant non-ASCII

Seggan - On Strike

Are those letters not ASCII?

Neil

wait, thinking about it they have a quoting problem, so they "fixed" it by not supporting some characters

(I originally mistook ' for a smart quote)

although actually, reading it again, they only describe the problem character

I should go to sleep, this chemotherapy has addled my brain (well mainly my stomach)

DLosc

23:49

@user ~~Me, tomorrow~~

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