I have seen posts about `0.0 == -0.0` but I wasn’t...
# announcementsg
goku
08/27/2019, 1:32 PMI have seen posts about
0.0 == -0.0m
Marko Mitic
08/27/2019, 1:34 PMthat's how floats work 😄
r
Ruckus
08/27/2019, 1:35 PM@Marko Mitic I think you mean that's how floats don't work 🧌
m
Marko Mitic
08/27/2019, 1:37 PMfloat has a dedicated sign bit, so -0 is a valid option
b
Burkhard
08/27/2019, 1:37 PMthe first bit of each float denotes plus/minus. Therefore float have both
0.0-0.0m
Marko Mitic
08/27/2019, 1:38 PMints only have one 0, but
-Int.MIN_VALUE == Int.MIN_VALUEr
Ruckus
08/27/2019, 1:38 PMYes, I know, though that doesn't mean much. Look how many different representations there are for
NaNRuckus
08/27/2019, 1:40 PMYeah, two's compliment was a surprisingly brilliant idea, despite the edge cases.
m
Marko Mitic
08/27/2019, 1:44 PMedge cases are overflow-related, there isn't a correct way to handle those so I can't take that as a negative
Marko Mitic
08/27/2019, 1:44 PMso, two's compliment was a surprisingly brilliant idea , despite the edge cases
r
Ruckus
08/27/2019, 1:47 PMFair point 🙂
d
Dico
08/27/2019, 5:03 PMIt's great how Float.NaN != Float.NaN
Dico
08/27/2019, 5:03 PMIt's great that
(x != x)Dico
08/27/2019, 5:04 PMThis is amazing api design
Dico
08/27/2019, 5:04 PMViolating equals contract
Dico
08/27/2019, 5:04 PMYes
r
Ruckus
08/27/2019, 5:14 PM😆
g
goku
08/27/2019, 11:11 PMI guess sign of your 0.0 is another thing you cant choose lol
goku
08/27/2019, 11:23 PMHow do you flip sign of a double or float in this case? Apparently unary minus doesn't work
d
Dico
08/27/2019, 11:32 PMYou could do it on the raw bits
a
Al Warren
08/27/2019, 11:49 PM-0.0 is an IEEE standard btw.
g
goku
08/28/2019, 12:02 AMYes, I’m aware of that. This isn’t the first time I saw -0.0. But in the articles I saw in the past they mostly talked about its existence and what it returns when compared to positive zero. I wasn’t expecting to see it as a result of simple multiplication like this. I did a quick research and I couldn’t find any posts related to this. I’ve seen posts about why one should use BigDecimal over double, and how it doesn’t handle precision well, but nothing related to this. And I think this is important, or I am missing something
3 Views