Thomas Pornin wrote:
According to Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com>:
You misunderstand my words. Mathematically, the absolute value of
some number is always non-negative. A negative result is "clearly
incorrect".
Note that if you add two positive values of type 'int' you may also get
a negative result. This is no more and no less incorrect than Math.abs()
returning a negative value.
That depends on your point of view, I suppose. In the sense that many
consider arithmetic operators more "fundamental" than a call to a Math
function, it is more reasonable to define the method to always throw an
exception on invalid input than to require the same from the basic
arithmetic operators.
More importantly of course, there are computational (non-mathematical)
justifications for allowing silent overflow for basic arithmetic, but
not for higher-level operations.
But in the sense that it's "no more and no less incorrect" of one or the
other, then yes...they are both incorrect behavior.