On 12.06.2018 09:01, Mattias Gaertner wrote:
Floats can represent 1.5 exactly.
Of course I do know how the binary representation of floats is done on
X86 and similar architectures, and hence that same provides a bit
combination that exactly defines 1.5.
That is why I did say *relying* on the exact value of a real number is
erroneous. (Supposedly with the common archs, no representation of a
rational a/b will be exact but those with b = 2**n).
But for an application programmer it should not be considered common
knowledge, that on the architecture his program is to run on, 3/2 can be
represented exactly while 2/3 can't.
That is why an application programmer should be trained not to do any
assumptions which float value is to be considered to be exact and which
is not.
-Michael
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