Python Can't Do Math?? #python #programming #coding

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[alesandreo]

This happens in any language that uses floating point math.

[FuDaVan]

fun fact: you don't use floats or double for currencies. you use int and long

[alejandroangongandara]

** proceeds to check this information in repl **

[John]

Thats why python has Fraction(). I was so surprised to know this, it basically represents all rational numbers with no information lost by dividing.
You can do all kinds of operations with it too, and you get back a fraction.
Its all fine until you have to convert floats to fraction lol

[andrewhabroad]

Quickly. Floating points use binary addition which is fractional addition so 0.7 and 0.6 are represented in memory as binary numbers which add differently compared to base-10 numbers.

[DSamp]

If you do actual scientific calculations that make sense to use floating-point over decimals, the math.isclose() function is useful to dodge rounding problems. 0.6 + 0.7 != 1.3, but isclose(0.6 + 0.7, 1.3) is true even if you lower the "relative tolerance" parameter from 10^-9 to 10^-15.

[Zend]

"Insufficient funds" command and conquer players will understand

[alexandresilva]

Ok my mind is blown, we just learned about floating and fixed point numbers in class a few weeks ago and I thought "Wow, I'll never use this", but here we go, I know the explanation to this because of that class!

[reycors]

yo dude love your shorts keep it up <3
i dont even code xD

[cn-ml]

Never ever use floating point arithmetic for basic money calculations. Always use decimal or other fixed point representations

[ripp_]

this happens in all languages
And is why you don't ever use floating point numbers for currency
import your the Decimal class for your langauge

[PharaelMartins]

In this case, would be recommended if you use the round () function to get the nearest integer?

[krispyking]

similar to the whole 0.1 + 0.2 situation

[IIdo.]

It's because a PC is dumber than me.

[IchorDragon]

That's why my teacher always want us to do like
a = float(0.5) instead of a = 0.5

[eternalunion]

use binary coded decimals for currencies, at least that is how I learned it

[HalfAsleepSam]

This is in literally every language that has floats?

[whittakertheo]

This is something that has to do with Numerical Methods

[wolffwolfie]

Just wait until he discovers JavaScript. There is no solution for that.

[dadutchboy]

Represent money with the smallest possible value, cents