On 09/05/2011 10:57 PM, xyz wrote:
hi all:
As we know , 1.1 * 1.1 is 1.21 .
But in python ,I got following :
1.1 * 1.1
1.2100000000000002
why python get wrong result? Who can tell me where's the 0.0000000000000002
from?
It's not a python error It's the nature of floating point arithmetic
to be inaccurate on *ANY* computer. Python just allows you to see the
inaccuracies.
(But try:
print 1.1*1.1
and see that the print statement does hide the roundoff error from you.)
Read this for more info:
http://pyfaq.infogami.com/why-are-floating-point-calculations-so-inaccurate
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