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Beginning Java

-0.0 and +0.0

Jello Yao

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Posts: 13

posted 20 years ago

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Does it true or false? Thanks!
Math.min(-0.0,+0.0) == Math.max(0.0,+0.0);

Jello Yao

Greenhorn

Posts: 13

posted 20 years ago

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I compiled it. The printout is true. Why Java consider -0.0 equals +0.0?

Ilja Preuss

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Posts: 14112

posted 20 years ago

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Because it actually *is*?
Why would you expect it to be different?

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John Lee

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Posts: 2545

posted 20 years ago

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In Java, there are not special notations of -0.0 and +0.0. I think maybe in Fortran, there is such thing, but I am not sure.

Jim Yingst

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Posts: 18671

posted 20 years ago

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Yes there are. See the JLS for more info.

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Dirk Schreckmann

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Posts: 7023

posted 20 years ago

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For the lazy (like me):

The IEEE 754 standard includes... positive and negative zeros...
Positive zero and negative zero compare equal; thus the result of the expression 0.0==-0.0 is true and the result of 0.0>-0.0 is false. But other operations can distinguish positive and negative zero; for example, 1.0/0.0 has the value positive infinity, while the value of 1.0/-0.0 is negative infinity.

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