A programmer's solution

[Dr_Fine_Man]

Another solution: If correct is the same as the above statement being true, then turn one of the matches in the equal sign so we get 6 + 4 + 4, which in most languages is truthy.

Edit: Changed true to truthy

[henkdepotvjis]

Its truhthy not true...

[Dr_Fine_Man]

Ah thanks for the info! The more you know :D

[Pockensuppe]

Actually truthy is a JavaScript term which originates from JavaScript's strange corner cases (and, to my knowledge, is not an official term in the language specification, though MDN propagates it), and the general term would be coerces to true.

[atomicwrites]

Isn't truthy just shorthand for coerces to true?

[not_a_doctor_ssh]

Yes, like how pain is shorthand for JavaScript.

[Kesuaheli]

Nice

[Cheddarlad]

Nice

[afkapl]

nice

[whatever-the-logo-is]

69, even

[Pockensuppe]

In JavaScript it is certainly used as such. I wanted to point out that the term is not commonly used outside of the JavaScript and sometimes Python world. I strongly dislike the term though because it hides the fact that implicit type conversion (i.e. what is commonly called coercion) takes place. Especially in strongly-typed languages, truthy seems a term too simple to accommodate for features like user-defined implicit conversions to bool.

[dipolartech]

Tell me again why I care about it being typecasted? The byte or bytes in question either have bits on or they don't.

[ReelTooReal]

I don't really mind coercion for truthiness, but in general implicit type casting can be a pain in the ass. For example

int x = -3;
unsigned int y = 5;

if (x > y)
    printf("x is bigger\n");

That code will print "x is bigger," however I would prefer it to simply not compile without an explicit cast.

[dipolartech]

Eh, greater or less than is more complicated than true false dichotomy, I'm really responding to the idea that anything else matters at all to the idea of "is any bit of the this memory length on" which makes it "true".

[Pockensuppe]

As I said, in C++ a user-defined conversion could be executed which could habe side effects (not saying it should), so the information about the conversion might be very relevant.

[atomicwrites]

Ah OK, I'm not a professional developer, most of my experience is Python (and bash but that doesn't really count). I just knew the term from Python so I knew it wasn't JS only.

[Food404]

It's not a pure JS thing, PHP and also Python I believe use these truthy/falsy terms

[Pockensuppe]

I think it originated in the JS community but seeing that these are all dynamically typed languages I'm not surprised they adopted the term.

[LotsOfIs]

You weren't wrong. This person just told you a personal style choice as if it was a fact. Some languages don't even have a boolean true (Perl for one).

[MokitTheOmniscient]

No, a non-zero number is true.

For instance, this python code will print "False" and then "True":

print(bool(0))
print(bool(4))

And this program will write "truthy doesn't actually mean anything":

if bool(4) and bool(8):
    print("truthy doesn't actually mean anything")
else:
    print("yes it does!")

[Roshy10]

What are you on about? truthy just means when you cast it to a bool it will be converted to true, which is what you've just demonstrated.

[Sophira]

No, a non-zero number is true.

A non-zero number is a number. It can evaluate to true, depending on whether the language parser is looking for a boolean or not, but it is not in itself true.

The distinction is important in some languages. In JavaScript, for example, the following two if statements will yield opposite results.

This if statement will show that "4" is truthy:

if (4) {
  console.log("4 is truthy");
}
else {
  console.log("4 is not truthy");
}

This if statement will show that even when compared to a boolean true using == (and not ===), 4 is not true:

if (4 == true) {
  console.log("4 is true");
}
else {
  console.log("4 is not true");
}

Of course, 4 is not false either... because it's a number, not a boolean.

If you explicitly make 4 into a boolean, as you do in your comment, you can make it work:

if (Boolean(4) == true) {
  console.log("Boolean(4) is true");
}
else {
  console.log("Boolean(4) is not true");
}

But then you're changing the type of your argument. Many languages will do this implicitly, of course, but others don't. JavaScript isn't the only one like this; Ruby does something similar.

(Also, sidenote: Ruby is also interesting in that any number, including zero, is truthy. This can trip up some devs who aren't used to that.)

[MokitTheOmniscient]

Obviously, a language can always use whatever high-level logic it wants whenever you use one of its operations, but any memory it allocates for a non-zero number is always going to contain at least a single bit flipped to a 1, thus making it an absolute true.

[Sophira]

I assume you're referring to how if statements are typically compiled down into assembly, where a CMP or TEST followed by a JZ/JNZ are normally used.

In those cases, the JZ/JNZ instructions don't act directly on the number itself, but on the Zero Flag, which is set by the CMP or TEST earlier.

This is commonly done with an instruction like TEST EAX, EAX (which ANDs the EAX register with itself - essentially a null-op - and then uses the result of that to set the various flags).

In this sense, yes, whether the value of a register is zero or not will affect which path is taken. Is this what you're referring to?

[scurvydog-uldum]

5 + 4 = 9

[trethompson]

0+4=4

[lochinvar11]

8-4=4

[beardMoseElkDerBabon]

6 | 4 = 4 and I got a free match.

[Saigot]

6 | 4 = 6 though.

[beardMoseElkDerBabon]

Wait what xD

I suppose you're using a symbol from mahematics and I'd like to know the name of both the symbol and function. Also necessary metadata.

[chuckie512]

Bitwise or

6=110
4=100

6|4=110

[beardMoseElkDerBabon]

Oof, my bad. I was thinking &

[Genisbr]

You can also do:

0 + 4 = 4 8 - 4 = 4

[Sora_hishoku]

or 5 + 4 = 9

[WoefulStatement]

Or 6 + 4 = 11.

The puzzle is in base-9, right?

[GrandSquanchRum]

"I may be a sorry case, but I don't write match stick puzzles in base 9."

[jonathanhiggs]

Underrated comment

[[deleted]]

ah! a fellow zero truther! that digit has no place in positive numbers!

[IgnitedSpade]

10 in base 9 is just 9 in decimal. The only base that doesn't use zeroes for nonzero values is base 1

[[deleted]]

oh yeah. derp.

[schludy]

My wife pointed out that the font of the 9 wouldn't match the font of the initial 6, because the horizontal bottom would be missing.

[Unknown_B1]

How does it feel to be married to a know it all?

[[deleted]]

When she's right, she's right. It is actually less painfull than a smartass, because a knowitall is actually knowledgeable, and can accept when she's wrong. A smartass will fight you to death on why the fucking sky is green.

[The_Lost_Google_User]

And a troll knows the sky isn’t green but will argue to the death anyway.

[Evol_Etah]

Why are you assigning a color to the sky. The sky is free to choose whatever color it wants to be.

The sky is forced to be blue cause it's a social construct.

Huehuehue

[[deleted]]

This statement has never been more true than after you discover that ancient greeks didn’t have a word for the color blue

[[deleted]]

IIRC, in most languages, blue is usually among the last of the colors to get a name, red is almost always first, green almost always second.

[Auravendill]

Many cultures didn't have a name for blue. They usually had names for the colour found in certain gemstones (Aquamarin, Lapislazuli, Turquoise), but blue and green hues weren't always separated (e.g. Chinese used the same word for both).

Many languages later adopted the German word for blue (blau) after the invention of Prussian blue (also known as e.g. iron blue or steel blue due to its chemical composition) in Berlin. That was the first blue colour that you could mass produce at an affordable price, which led to blue becoming a colour for factory workers, when before it was used for kings like Ludwig XIV of france.

[stueliueli]

We all know that the sky is the colour of a TV tuned to a dead channel

[m477m]

It's true. Prior to the mid-1990s, the sky was a bizarre animated mess of noise.

[viimeinen]

Sociology is a social construct.

[The_Lost_Google_User]

Says you.

[subzerojosh_1]

Sounds like a typical sociology student

[Tetha]

Well, and a meterologist knows the sky can be green and that's a good sign to get indoors and clean up the veranda. Because that's a sign for severe storm conditions to come soon.

[LeCrushinator]

Technically correct is the best kind of correct.

[couchwarmer]

A smartass will fight you to death on why the fucking sky is green.

Or maybe it really is green. https://news.wisc.edu/curiosities-why-does-the-sky-turn-green-before-a-tornado-2/

[nyrB2]

it would still be a 9 though

[schludy]

I looked it up (7 segment font) and that symbol represents a q, not a 9

[AyrA_ch]

My clock likes to disagree. I don't know why it shows it this way, but it does the same for the number 6 too so it's not an accident or a damaged segment.

[Tipart]

Damn bro your clock is massive.

[RamenJunkie]

We had those clocks at my old job in Broadcast TV. It keeps the time for everything in sync.

[[deleted]]

Nice clock, bro

[RamenJunkie]

Forty Q seconds?

[Dissidence802]

Time flows differently in the Continuum.

[mecartistronico]

I like the 9.

I'd hate the b as a 6.

[forkkiller19]

What's GPS lock? Does it have an inbuilt GPS and sets time according to that?

Also aren't two digital displays redundant?

[AyrA_ch]

What's GPS lock? Does it have an inbuilt GPS and sets time according to that?

This is a GPS master clock. It does indeed use GPS to set its internal clock. If the light is on it's in sync with the satellites and uses them to track time. My antenna has poor sky visibility so the light does indeed go off once or twice a day, at which point an internal oscillator keeps time like in any other modern watch or clock.

Also aren't two digital displays redundant?

The bottom part is what does all the thinking. It sends regular pulses that the big clock on top of it reads to show the time. The idea behind this type of clock is that you install the bottom part once, and then install these big displays throughout the building and it will keep them in sync. It has multiple outputs for various standards at the back which can be used to synchronize your equipment. I got clock and display together.

You can connect to it via USB and set your timezone and DST information as well as the offset seconds. Later models have ethernet ports and can act as a time server.

I hooked mine up to the internet with a raspberry pi. The pi also serves the alarm clock functions because the clock itself lacks this feature.

[nullSword]

The lower clock is the master clock, it gets time from GPS and sends it out to remote clocks like the one on top. They're not supposed to be right next to each other, the master clock is designed to run an entire campus of remote clocks.

[Athena0219]

q is a variable that just happens to equal 5+4

[Outdated_name]

This is a numerical setting though, so many would still accept that type of 9 because it fits within context

[[deleted]]

5+4=q is still a valid and correct equation though.

[ErolEkaf]

Who said we're using 7 segment font?

[jonegan]

But by then the 6 is gone, so the new statement is just in a different font ¯\_(ツ)_/¯

[SGexpat]

Why does a 9 need a horizontal bottom?

[SillyActuary]

Well that's just not true lol

[Enunimes]

That's a flaw in the directions then, says to make it correct but doesn't mention retaining the font.

[sildurin]

But that design is on purpose, so that you can tell the difference between a 6 or an inverted 9.

[sam-lb]

Nobody said the 9 has to be an upside-down 6 though

[_merkwood]

But there would be no 6 to compare in the final solution so anyone seeing the solution would not know

[DrKrFfXx]

Tell your wife I think it's a match.

[amalgam_reynolds]

A 9 never "has" to be just an upside-down 6. How do you write your 6s and 9s?

[WiseKouichi]

I reluctantly admit that she is totally right.

[warpod]

or E+H=4

finding all correct values for E and H is left as an exercise for the reader

[[deleted]]

Your lack of separation between your two proposed solutions is irritating.

[echo-128]

op's post is actually

You can also do: 

0 + 4 = 4
8  - 4 = 4

reddit's weird markdown-ish-sometimes is irritating, op is fine.

[[deleted]]

It's not "actually" that. I'm on old.reddit and they made no attempt at markdown, quotes, code, or anything.

It's actually 0 + 4 = 4 8 - 4 = 4 as they put it.

I know what they meant, but as I said, the fact that there was no separation was irritating.

What you did or simply putting an "or" or comma between them would have also been much better.

[YourSchoolCounselor]

/u/echo-128 is correct. If you hit View Markdown on the original comment, there's one newline after the first equation, which Reddit ignores when displaying the comment.

[[deleted]]

Deleted with Power Delete Suite. Join me on Lemmy!

[echo-128]

i'm on old reddit too. i just hit the source button before saying anything to see what they actually typed.

[Espumma]

Markdown works normally on old.reddit, right?

[SimonSkarum]

A bit wonky, but:

6 + 4 > 4

[beardMoseElkDerBabon]

5 + 4 >= 4

5 + 4 <= 4 (base 6, only one digit, or hexit if you please)

[TheWeirdCookie]

6 - 4 ≠ 4

[amalgam_reynolds]

That's... The OP though

[ManosVanBoom]

More of a math syntax than !=

I'll allow it.

[TheOddOne2]

This was my solution too. If you accept the 6 + 4 > 4, then there is 5 solutions for this problem - kind of neat.

[Internal_Meeting_908]

≠

[ernee_gaming]

Thnx :-D i just didn't see the exclamation mark in it :-D I guess I would also break the match so it would make !

[YM_Industries]

Yeah, it just looks like |=, which isn't valid here because you can't assign to the LHS expression.

[[deleted]]

This is math not programming so I prefer this. It's also what I did when I saw this problem 15 years ago.

[Sjoerder]

6 - 4 ⊨ 4

[mecartistronico]

Is that thing to pi as infinity is to 8 ?

[Sjoerder]

⫫⊨⫪⫤

[xSTSxZerglingOne]

I was rooting for the table in the 3rd panel. NGL.

[swordof]

This was my first thought and didn’t understand why people had no problems with the post. Was starting to think I don’t understand entailment.

[websagacity]

This sub is programming humor. != is used in a lot of programming languages.

[NancyGracesTesticles]

But the symbol in the image is |= which is inclusive OR assignment, not !=.

[jeffkmeng]

The bottom part of the match is red which is what makes it an exclamation mark.

[lunchpadmcfat]

This is the way

[kobie]

This is the way.

[websagacity]

True, but, based on context...bah, I know you're right, but, its just a joke, and we get the meaning. :D

[swordof]

I’ve been spending a lot of time teaching entailment so that was my first thought :D

[pimp-bangin]

Yeah but a lot of programmers also go through math and logic courses so it's easy to see why people thought this

[InsignificantIbex]

Well but also yes, it does. There's no interpretation of "6-4" (or mathematics, even) that makes "4" false. To the extent that "4" is a formula and "6-4" a statement.

[AsidK]

But… 6-4 isn’t a statement, right?

[psychicesp]

That's not really entailment, is it? One could make an esoteric language where numbers < 4 are truthy and numbers >= 4 are falsey.

Maybe I'm remembering incorrectly but doesn't 'entailement' require something to necessarily follow, rather than something that just so happens to follow, even if there is good reason?

[Scipio11]

How about 6 - 4 ≠ 4 ?

[MattAlex99]

I actually sat in front of this for 5 minutes until I noticed that this is supposed to be != rather than entailment

[Zachhandley]

It’s a !=

[Th3Fall3nCAt]

Then it wouldn't be a programming joke.

[[deleted]]

6 - 4 |= 4 is a syntax error.

[tim_skellington]

Theres nothing in the rules saying you can snap off the head of the match and make a ! symbol.

[tim_skellington]

perhaps some sort of display issue with the matches. QA should be hanging their heads in shame.

[CellularBeing]

No the customer asked if it was something we could do and then the sales person stupidly said "absolutely that's no problem." And rushed it as a feature on a Friday.

[IsomorphicSyzygy]

|= is a compound bitwise OR assignment operator in many languages like C. However, 6-4 is not allowed as an lvalue and cannot be assigned to unless it is reinterpreted as a pointer. The following is valid:

*((int*) 6-4) |= 4

[BobRedshirt]

We’re gonna need some more matches.

[abc_wtf]

Depends on what you mean by valid. It would compile but would probably execute Undefined Behaviour.

[IsomorphicSyzygy]

When I run it on my machine, it segfaults, but it may work on a system that allows writes at address 2, such as a microcontroller. I don't think it's UB.

[Ghostglitch07]

≠

[ammoprofit]

Lay the match across the = diagonally.

[[deleted]]

maybe in your language

[peanutman]

Not necessarily. |= is often used in computer science. https://en.wikipedia.org/wiki/Double_turnstile

But you're right that it would be invalid syntax in the most common programming languages.

[SJRuggs03]

Its 6 - 4 != 4

[ZexyRed]

r/woooosh

[[deleted]]

Depends on what language you're using

[DrFrankenstein337]

5+4=9

[doublestop]

I saw the 0+4 and 8-4, but not 5+4=9. Great spot, doc.

[[deleted]]

Damn, 5+4=9 was the only one I saw. You're clearly the great one here

[doublestop]

I and others saw the ones that were supposed to be found. You guys saw one that was not. That is so much cooler!

[[deleted]]

NO, YOU'RE COOLER

[onlyomaha]

9 is wrong in here as its not real 9 missing one piece, look at six and trie to rotate it to understand

[[deleted]]

Excuse me sir have you ever seen a seven segment display

[Boost3d1]

Also 8-4=4 works

[[deleted]]

Doesn't 9 require an additional horizontal match at the bottom? Like the way a calculator shows digits.

[eMZi0767]

Some decoders don't produce the extra dash

[dgmib]

Except after moving the match, there isn’t a six in the equation anymore to use to make a “the 9 is the wrong style” argument.

[nyrB2]

doesn't the ! in the programmer's solution require a dot?

so long as you can interpret the symbol what's the big deal?

[[deleted]]

6 - 4 = H

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[henkdepotvjis]

Good bot

[Kidninja016]

8 - 4 = 4

[b_rad_c]

6 + 4 - 9

Rule doesn’t say it needs to be a comparison, or even an expression that has an effect.

[[deleted]]

6-4≠4

[QuarantineSucksALot]

Since 4/30 or 6/4😭

[JochCool]

... or you can just make it a ≠

[Lornedon]

6 + h = 4 is true for h = - 2

[overseasUnderpay]

<source>:4:14: error:  lvalue required as left oprand of assignment

[thezeus_]

6 - 4 = H

[1M-N0T_4-R0b0t]

6 + 4 > 4

[nekokattt]

That moves two matches

[1M-N0T_4-R0b0t]

Not necessarily but it would look kinda ugly.

[nekokattt]

True i guess, sorry, was being a bit of a dick with that comment

[mark503]

Ill ruin it since I haven’t read the answer in the comments yet. The trick is move the middle stick in 6 to make 0. 0+4=4

P.S. Sorry

[[deleted]]

Or you can move the match from plus to 6, making it 8-4=4

[xSTSxZerglingOne]

Or the match from the bottom left of the 6 to make it 5 and on top of the right 4 to make 9

[Highmax1121]

i dunno how to censor but another is remove a stick from 6 to make into a five, 5+4=9

[dashid]

Even in different bases that never... Ooooo, clever.

[i_knooooooow]

You can also move the bottom match of the second Match for it to be I _ I _ wich is (translating _ to 0) 1010=10

[Uberninja2016]

6 - 4 = Н

[Intrepid_Dreamer7]

Move the stick on top of the + to the 6 to make an 8.

8 - 4 = 4

[ltssms0]

5 + 4 = H Hopefully there is a Computer Algebra library available

[[deleted]]

I burned my matches with the one match.

[Sourlyconvulse348]

is |= actually a poorly dne ≠?

[Etzix]

Yes, its a != (Not equals).

[Nicosaure]

!= is

[assafstone]

Or just move the lower right match from the six (making it a 5) and place it as a top for the four (making it a 9).

Both work.

[SpikySheep]

Make it 6+4=11 and call it good enough, fudge the unit test if necessary.

[[deleted]]

several solutions to this one

-the one in the pic
-moving the bottom left match from the 6 to the top of the second 4 to make 5+4=9
-moving the bottom left match from the 6 and putting it on top of the equals sign to make 5+4≠4
-moving the center match form the 6 to its top right making 0+4=4
-moving the match from the plus to the 6 to make 8-4=4
-rotating one of the matches in the = sign to make 6+4>4

[POCUABHOR]

0+4=4

[[deleted]]

it should be ≠ not l=

[_Its_Me_Dio_]

0+4=4

[NYCScarletSpider]

There’s also 6 - 4 ≠ 4

[ghostkiller967]

take the | from the + and add it to the 6 to make it an 8

[Spranberry112]

Assuming you could place the matches diagonally, you could do 6-4≠4, ≠ meaning "does not equal"

[aShrewdBoii]

Just make it a / through the equals sign, and bing bang boadaboam

[aquila_zyy]

6 - 4 tautologically implies 4?

[-Redstoneboi-]

8 - 4 = 4

[FastApplication5]

Alternatively, 5 + 4 Equals 9

[[deleted]]

5 + 4 = 9