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# Divinding floating points by zero

Leandro Melo
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Joined: Mar 27, 2004
Posts: 401
Hi!
Little doubt.
Kathy's book says that when divided by zero, a floating point may become infinity or -infinity depending on the sign of the zero.
I checked it out and verified that, at least with sun's jvm, this result is actually due to the sign of the number beeing divided, the sign of the zero doesn't really matter.

Leandro Melo
SCJP 1.4, SCWCD 1.4
shandilya popuru
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Joined: Dec 21, 2004
Posts: 95
hi leandro

thats right the sign of the numerator is taken into consideration rather than the sign of zero

sandy
ankur rathi
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Joined: Oct 11, 2004
Posts: 3830
yes , you are right ... I have also tried ...
Barry Gaunt
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Joined: Aug 03, 2002
Posts: 7729
The following example shows that the sign of the 0.0 certainly has an effect on the sign of the infinite quotent:

Output:

Getting someone to think and try something out is much more useful than just telling them the answer.
Barry Gaunt
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Joined: Aug 03, 2002
Posts: 7729
This code:

and its output:

might give you an idea what's happening in your tests.
ankur rathi
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Joined: Oct 11, 2004
Posts: 3830

output :
Infinite
Infinite
-Infinite
-Infinite
ankur rathi
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Joined: Oct 11, 2004
Posts: 3830
Are you mean :
there is no difference b/w 0 & -0 .
ankur rathi
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Joined: Oct 11, 2004
Posts: 3830
I have checked :

1] there is no difference b/w 0 & -0 .
2] but this two 0.0 & -0.0 are different .
Mark Spritzler
ranger
Sheriff

Joined: Feb 05, 2001
Posts: 17276

6

The actually is a difference between -0.0 and 0.0, try sorting it and see what order they come out in.

Mark

Mark Spritzler
ranger
Sheriff

Joined: Feb 05, 2001
Posts: 17276

6

"Sandy"-
Welcome to the JavaRanch! Please adjust your displayed name to meet the

JavaRanch Naming Policy.

You can change it

here.

You used to be in compliance. Why did you change your name?

Thanks! and welcome to the JavaRanch!

Mark
[ January 14, 2005: Message edited by: Mark Spritzler ]
Leandro Melo
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Joined: Mar 27, 2004
Posts: 401
Allright, you pointed the singalling diferences between 0.0 and 0 and -0.0 and 0. But, what is the reason behind it?
Jeroen Wenting
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Joined: Oct 12, 2000
Posts: 5093
Originally posted by rathi ji:
Are you mean :

I think he's actually quite nice

42
Tony Morris
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Joined: Sep 24, 2003
Posts: 1608

Allright, you pointed the singalling diferences between 0.0 and 0 and -0.0 and 0. But, what is the reason behind it?

The definitive source that you appear to searching for is called "IEEE754".
This defines how floating-point data types are represented, and how they are operated on, etc.

Edwin Dalorzo
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Joined: Dec 31, 2004
Posts: 961