-1 % 10

Conversation started Oct 22, 2021 at 3:10.

DLosc

Oct 22, 2021 03:10

CMQ: Should (-1) mod 10 be -1 or 9?

W D

Skidsdev

I remember depending on the day they were either very quick to post or took quite a while, so RSS feeds makes sense

W D

0 <= a mod K < K

maths

like 9 mod 10 wouldn’t be -1

unless you’re doing congruence or something

thejonymyster

concurring 9, i think any mod that does the weird negative thing should be clearly notated as a separate command

signedmod or something

caird coinheringaahing

@Skidsdev Yeah, nowadays the challenge is to get New Posts or New Sandbox Posts to post something with a score greater than 0 :P

and I mean "post", not "edit to", hyper :P

lyxal

Oct 22, 2021 03:12

@DLosc if in doubt, ask apl

hyper-neutrino

@cairdcoinheringaahing i was just about to mention that

lyxal

10 | ¯1
9

caird coinheringaahing

hyper-neutrino

why are you still up at (i think it's) 4

caird coinheringaahing

Because my brain seems to think that sleep is the enemy

emanresu A

Oct 22, 2021 03:13

@cairdcoinheringaahing Returns an empty string

W D

@thejonymyster maybe “Nearly Fibonnaci Golden Rectangle” ???

thejonymyster

i mean for the title, sure

the actual rules are the real issue

DLosc

@WD @thejonymyster @lyxal I agree! But Scala doesn't. :P

Skidsdev

@DLosc Braingolf, aka python, agrees that it is 9

W D

@DLosc how doesn’t it? I don’t do Scala so I have no idea

thejonymyster

Oct 22, 2021 03:14

i guess you could quick fix it by checking for a negative output and adding 10

W D

what about -101 mod 10

DLosc

@thejonymyster I'm writing a function to do that right now

thejonymyster

@WD that will return -1, which you can add 10 to to get 9

if it doesnt, then the mod function just doesnt support negatives XD

lyxal

@hyper-neutrino 4:15 to be exact. At least that's what github refined tells me

DLosc

@WD Even more shocking is that Julia, a language that's a lot more angled toward math, also does it wrong: Try it online!

hyper-neutrino

Oct 22, 2021 03:16

well i was just too lazy to include that but yes 4:15 (well actually, 4:16 now)

W D

QUICK FIX
For mod
Function mod_returns_pos
If LEFT is negative
Return mod_returns_pos ( negative 1 * LEFT, RIGHT )
Otherwise
Return builtin_mod( LEFT, RIGHT )

caird coinheringaahing

@hyper-neutrino I think you'll find its 4:17

Skidsdev

@WD python3/braingolf still says 9

W D

actually, it’s 16:17

lyxal

Jelly says 9

DLosc

Oct 22, 2021 03:18

@WD That doesn't work, though, right? It'll give 1 instead of 9

thejonymyster

@WD so -1 mod 10 =... 1?

yeah ahah

W D

Oops

Skidsdev

@lyxal Jelly also runs on python afaik

W D

lol

oof

hyper-neutrino

@cairdcoinheringaahing no, my clock says 4:18

W D

Oct 22, 2021 03:18

16:18

not 4:18

Skidsdev

uh it's actually 23:18

lyxal

05AB1E says 9

W D

For me it’s 14:18

thejonymyster

@WD ooh, golden ratio

hyper-neutrino

no I actually mean 4:18

W D

Oct 22, 2021 03:18

OI STOP WITH THE language says 9

thejonymyster

but with the ratio bar moved a bit

emanresu A

It's 4:18 PM for me

thejonymyster

and also wrong mathematically

W D

2:18pm

hyper-neutrino

because I am talking about caird where it is 4:18 and no I do not mean PM. it is 23:18 where I am

W D

Oct 22, 2021 03:18

99999999999999999999am

lyxal

@WD hey we're in the same timezone

W D

-_-

lyxal

or at least, i'm artificially in your timezone

W D

I’m joking, I’m actually 3:19pm

thejonymyster

im in all of your timezones because im in your computer

lyxal

Oct 22, 2021 03:19

@WD no, you're not JoKing.

You're WD

W D

Oh wait

lyxal

i can't believe you made that mistake

Jo King

@WD it's 14:19 here though

caird coinheringaahing

@WD That unfortunately overflowed time, it is now -2147483648 o clock

W D

the oldest trick in the book be like

@cairdcoinheringaahing correction: Infinity o’clock (maybe inf o’clock if python 3)

Jo King

Oct 22, 2021 03:20

@cairdcoinheringaahing what is that with daylight saving

caird coinheringaahing

-2147483647 o'clock

Bubbler

To be 100% precise with the remainder thing, there are three different ways to do it: always positive, follow sign of divisor, follow sign of dividend

The second is C way, the third is Python way

hyper-neutrino

average the positive and negative version

W D

What about 100 mod 3 and 100 mod -3

caird coinheringaahing

I have a fourth: randomly choose one

Bubbler

Oct 22, 2021 03:21

My fourth is always negative

W D

I have a fifth: crash the computer

thejonymyster

@Bubbler what does following a sign entail?

caird coinheringaahing

If it's negative, go backwards

thejonymyster

lyxal

A sixth way: positive and negative at the same time until you observe it

Jo King

Oct 22, 2021 03:22

check the wikipedia page for the visual graphs

emanresu A

#7: Make it positive if Lyxal's online, otherwise negative

W D

I.e. quantum physics and superposition

thejonymyster

@lyxal or positive and negative while you observe it, ± exists

W D

#8: always return 42

emanresu A

#11: Positive aside from mod intervention

Bubbler

Oct 22, 2021 03:22

@thejonymyster It defines the output of 100%-3 and -100%3

Former gives -2 if you follow the sign of the divisor, latter gives -1 if you follow the sign of the dividend

W D

#-2147483647: always return -2147483647

thejonymyster

@WD guaranteed to be modulo by fair supercomputer calculation

W D

lol x36

DLosc

@Bubbler QBasic does it C way and now I am sad :(

lyxal

@DLosc no, you're not sad.

W D

Oct 22, 2021 03:23

#Infinity: return square root of -1 (= i)

lyxal

@DLosc You're DLosc

DLosc

I am DLosc and I am sad :(

Bubbler

Well, what do you expect from a pre-C language

DLosc

I am saDLosc

emanresu A

@DLosc No, C does it QBasic way

W D

Oct 22, 2021 03:24

I have few doors

I have fe-WD-oors

thejonymyster

i uh

Bubbler

IIRC the C way was determined by the x86 way

thejonymyster

i cant do that with my name u_u

W D

Well, let’s get back on topic as we always do in this totally always on-topic and well-moderated chatroom

DLosc

12 mins ago, by lyxal

@DLosc if in doubt, ask apl

lyxal

Oct 22, 2021 03:25

@WD can I use you to make my Rubiks cube go faster?

W D

I know how to solve them

but not really

Skidsdev

@WD no. Curiously JS says -1

lyxal

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W D 31%
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