jbv wrote:
Nevertheless, how do you explain that the following :
put 36 into A
put 34.2 into B
put A-B into C
put C*100 into C
put trunc(C)
returns 180 with Rev 2.5 on Mac OS9, but returns 179 on other
platforms such as Linux or Win2000 ?
Just curious...
I was curious about that too.
What's the hardware involved in each case ? Are they all the same ?
It could be differences in the floating-point hardware (or floating
point emulation library).
Or it could be difference in the library used by Rev to convert from the
text string into fp format (if it chose a different value for the last
bit, it would be "180+tiny delta" instead of 180-tiny delta" (once
multiplied by 100) and then the trunc() call would get a different answer.
Remember they may *both* be considered correct answers, depending on the
binary representation used by different machines / libraries.
(Sigh. I don't like it either Jonathan - but after 34 years of computing
in a wide variety of languages, I'm getting used to it :-)
(I'm hoping that the OS9 machine is an old Motorola based machine,
rather than a PPC-based and Intel-based machine, and that I can use that
as my answer :-) :-) Though come to think of it, even if it's a modern
Mac (i.e. PPC) that may be different enough from the Linux/Win machines
you tried.
--
Alex Tweedly http://www.tweedly.net
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