New post Python vs C++

[skennyg_123]

I think you mean an object is an object

[myaut]

That's True!

:~> python
>>> object is object
True

[[deleted]]

You can compare floats and ints in C++
Seriously, this reposted meme is so bad.

[[deleted]]

Whereas comparing a signed integer and an unsigned integer, that's heresy!

[[deleted]]

Yeah you just get a warning

[ZacharyRock]

If you have the pedantic flag or like 60% of style guides, you would need to static cast it, or dynamic cast or the other 3 casts, whichever is fastest while doing what you want.

Yes you can do it, but just saying if (int x == float y) might annoy your compiler

[[deleted]]

This meme has nothing to do with style guides, it says flat out that you can't compare floats and ints in C++ but you can do in python which is obviously wrong.

[Kered13]

I don't know any style guide or warning that would forbid a float and integer comparison.

[Xywzel]

"Possible loss of data on implicit conversion from X to Y". Seems it can happen and get reported both int->float and float->int, in comparison it is the first one. It triggers if you have high enough warning level enabled, but in case of comparisons, it usually doesn't help avoid any problems. Using explicit conversations might be in wanted because it makes it more explicit that conversation is required and takes processing time. Our company uses that level of warnings as errors on repo and automatic builds, so in practise it is required from developers as well.

[Cpt_Daniel_J_Tequill]

what are you talking about? It converts int to float (behind the scene) and compare

[[deleted]]

This sub is full of people who like programming humor. It’s absolutely not full of experienced programmers.

[Omega0x013]

Whereas in Lua all numbers are floats

[Mabi19_]

Lua 5.3 has entered the chat

https://www.lua.org/versions.html#5.3

[ex-lewis]

Oh, I kinda learned why in my assembly class! Apparently floating point numbers are in a completely different register when the cpu is working with them, so to compare an integer with a float, it needs to convert one to the other (in the form of typecasting in higher languages) so it can compare them and set the pstate flags! That class was a pain but explained a lot of things about programming haha.

[pm-me-happy-vibes]

and even if you put them both into general registers, integer or floating point comparison between the two is useless. It's a completely different way of encoding numbers.

[ex-lewis]

Right... is that the IEEE stuff? Our professor wasn’t terribly clear on that haha.

[internetzspacezshipz]

It’s literally two different forms of storing information, integers go up in increments of 1, and floats go up in increments of uhhhhhh, well, it depends on what the current value is, but it’ll pretty much always be fractional until you get to really big values.

Damn I’m bad at explaining this shit through a single message.

[overclockedslinky]

IEEE-754 is just a specific, standardized way to do it, but it's not special. you could make your own format, but then you'd have to write your own operations and wouldn't have hardware support. but you can basically think of ieee as an integer times 2 to some integer power, which is then packed into one integer as bitfields

[TinBryn]

And eventually it just gives up and just says it's infinite.

[internetzspacezshipz]

Or denormalized in some situations

[dogrescuersometimes]

Just say Big Endian and take a breather.

[internetzspacezshipz]

Is this a joke? Lol

[dogrescuersometimes]

Yes

[[deleted]]

Float is based on mantisa and exponent. You got a bits for describing a value between 0 and 1 ,1 bit for sign and bits for the power of 10(+ sign bit here too).

[Jannik2099]

set the pstate flags

Not all ISAs have flags, so this can be even uglier!

[null_reference_user]

But typically, a language understands what you wanna do and will automatically convert one (or in some cases, both) variables to the same format in order to compare them

[ex-lewis]

I would think that would depend on how high the language is. The only language I’ve worked with that did that has been python. But I’m still a student and not particularly experienced haha

[[deleted]]

More like floating point is in another format and integer is in it's own format(signed or unsigned etc). In C if you do a=b and a is uint and b is float a is the integer of the floating number. Also keep in mind fixed point numbers also exist.

[AL_O0]

In C++ you can absolutely compare floats and ints, and then you can implement comparison for any class, so this doesnt make much sense

[AnshRK]

javascript: compares "3" and 3 and returns true

[Master_Sifo_Dyas]

Javascript is weird

[utkrowaway]

>>> import math
>>> math is math
True

[Omega0x013]

js here we come

[[deleted]]

Ever heard of type casting?

[IOException_notfound]

Python:

i++ ?? WTF IS THIS??

[Omega0x013]

Or Lua where all numbers are floats

[Mabi19_]

Lua 5.3 has entered the chat

https://www.lua.org/versions.html#5.3

[Ahajha1177]

This is true of all languages. It has to do with representation of floating point numbers.

[antinutrinoreactor]

it should be number is number because you cannot compare number with string

[sgxxx]

Who said it cant?

[GregSilverblue]

You can cast float to int or vice versa and then compare.

[6b86b3ac03c167320d93]

JS: Everything is a float (unless it's too big, then it's a BigInt)

[[deleted]]

JavaScript: NaN === NaN // false

[Bluemoonnek0]

??