why this code gives 3.0000000000000004 ?

Question

https://code.sololearn.com/W58tD25kA57C/?ref=app

Answer 1

https://www.sololearn.com/discuss/1606645/?ref=app

and of course,

https://stackoverflow.com/questions/21895756/why-are-floating-point-numbers-inaccurate

Answer 2

Hatsy Rei thanks for this start of explaination ;)

Answer 3

Seb TheS thx. i will sleep less stupid to night with this knowledge...

Answer 4

thx for your answers Mirielle🐶 [Inactive] but how 0.1+0.2 give 0.30...4 ?
it's not logic (mathematicly)

Answer 5

Oneill [HTML+JS+PHP] You need to know that computers store floats in binary.

Some 10th base floats can not be converted to binary.

Answer 6

Any float that can not be converted into a whole number by multiplicating it with 2 as many times as necessary, can not be completed in binary format.