Np

why i can't to compare O1 and O2?

program don't understand that are same and skip this line

but when i use function printf, you can see that they are same

Димас помоги)

can you send compressed imag?

why i can't to compare O1 and O2?

Don't use == to compare floating point values

Don't use == to compare floating point values

because of presicion?

Don't use == to compare floating point values

why?

what should I use?

what should I use?

^

why?

It makes rockets explode

It makes rockets explode

it does not

what should I use?

== but the other way can be: fabs(f1 - f2) >= 0.000001

but for the most part f1 == f2 should work

i do not want to download your image

because then i have to delete it after

so i would prefer you send the compressed or paste the code

why?

Because floating points are approximations where the order of operations matters.

you could also upload the file

i do not want to download your image

https://prnt.sc/ljmfke

https://itsfoss.com/a-floating-point-error-that-caused-a-damage-worth-half-a-billion/?fsmoe=false

https://itsfoss.com/a-floating-point-error-that-caused-a-damage-worth-half-a-billion/?fsmoe=false

👍🏻 good find

https://prnt.sc/ljmfke

the more accurate way is to find the minimal number you want

so lets say you want a hundredth precision that you are working with

then what you do is: floorf(O1 * 100) / 100;

so have: #include <math.h> at the top

uff..)

then do O1 = roundf(O1 * 100) / 100; O2 = roundf(O2 * 100) / 100;

roundf is more precise then floorf

and after that I can compare them?

this works on floats but since you are using doubles you might want to use round

yep after that you can do all the operations with no worries

Yeees its work!!

thank u very much 🙂

welcome

you SHOULD use == for comparision

but you want to set up the doubles correctly first

https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/ https://stackoverflow.com/a/4682941/4416573 I would say comparing floats using == is okay if false-negatives are acceptable.

https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/ https://stackoverflow.com/a/4682941/4416573 I would say comparing floats using == is okay if false-negatives are acceptable.

this is what i said first however this is a poor way of doing it

as any mathematical operation will result in accumulation of the errors

then do O1 = roundf(O1 * 100) / 100; O2 = roundf(O2 * 100) / 100;

if you do it this way you force the double to become more precise

and works with a finite set of decimals

why would you say rounding makes a value more precise?!

it does quite the opposite lol

it does quite the opposite lol

++

it does quite the opposite lol

is that why scientists round for precision?

is that why scientists round for precision?

they don't

they don't

they do

they don't round IN ORDER TO GET precision

look up significant digits

they round in order to show the unsure digit

look up significant digits

man, can't you just stop being a meme already?

they round in order to show the unsure digit

no to get RID of the unsure digit

https://en.wikipedia.org/wiki/Significant_figures

:facepalm:

at either case you have a double and it has a certain precision from your measurement

you should only be working with the max precision of your elements

Okay, well it depends, if you consider precise being accurate, then no, it's not. If you mean precise in terms of "stable" then it's true

PRECISION IS ACCURACY

Accuracy and Precision: Accuracy refers to the closeness of a measured value to a standard or known value. ... Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. well not exactly

I'm trying to create a function that returns random int between 0 and 1, but It always returns the same values in different program executions. As you can see in this image. Any idea why is this happening?

I'm trying to create a function that returns random int between 0 and 1, but It always returns the same values in different program executions. As you can see in this image. Any idea why is this happening?

Did you generate the seed?

Did you generate the seed?

he didn't

he didn't

Ik

This is the code

This is the code

You don't generate seed

Look at srand()

srand*

srand*

Ye

Stupid autocorrect

Ok, let me see

Solved thakns!

Solved thakns!

Np

Oh

Search this c++ pdf cpluplus You will get a book that will teach basics

Ok I have a weird problem