Nobody wrote:
On Wed, 07 Jul 2010 15:08:07 +0200, Thomas Jollans wrote:
you should never rely on a floating-point number to have exactly a
certain value.
"Never" is an overstatement. There are situations where you can rely
upon a floating-point number having exactly a certain value.
It's not much of an overstatement. How many areas are there where you
need the number
0.100000000000000005551115123125782702118158340454101562500000000000?
If I'm looking for 0.1, I will *never* (except by accident ;) say
if var == 0.1:
it'll either be <= or >=.
By contrast, if I'm dealing with integers I can say if var == 4 because
I *know* that there are values that var can hold that are *exactly* 4.
Not 3.999999999817263 or 4.0000000019726.
~Ethan~
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