|
poosible bug
|
|
Sep-28-2018, 08:35 AM
Hi,
a="1.1" b="2.2" print(float(a)+float(b)) on Python 3.6, this code returns 3.3000000000000003. Is it a bag or I made a mistake?
Sep-28-2018, 09:15 AM
No, this is not a bug: http://0.30000000000000004.com/
Almost dead, but too lazy to die: https://sourceserver.info
All humans together. We don't need politicians!
Sep-28-2018, 10:05 AM
(This post was last modified: Sep-28-2018, 10:05 AM by Mr_Keystrokes.)
I don't think it's a bug. It's just unique to python3.6.
You could use round:a="1.1" b="2.2" # Here the number of decimal places is the 2nd argument. x=round(float(a)+float(b), 2) print(x) (Sep-28-2018, 10:05 AM)Mr_Keystrokes Wrote: I don't think it's a bug. It's just unique to python3.6.It's not only unique to python3.6,see @DeaD_EyE link. Basic Answers. Quote:Because internally, computers use a format (binary floating-point) that cannot accurately represent a number like 0.1, 0.2 or 0.3 at all. Python has Decimal module,then it work like excepted eg doing financial calculation. >>> 0.4 - 0.1
0.30000000000000004
# Now it will be 0,3
>>> from decimal import Decimal
>>> Decimal('0.4') - Decimal('0.1')
Decimal('0.3')
>>> print(Decimal('0.4') - Decimal('0.1'))
0,3
|
|
|
