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Old September 10th 05 posted to sci.math,sci.physics,sci.physics.relativity
Dik T. Winter
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Default NOMINATION: Dirk Van de moortel for VVFWS

In article "Androcles" Androcles@ MyPlace.org writes:
....
| Assuming 16-bit signed integers, represented in hex:

I've just used 32-but signed integers.


1-s complement or 2-s complement?

| Is 0x7fff positive or negative?

The highest positive number you can represent in 16-bit signed integer.


Right.

| Is 0x7fff+1 positive or negative?

Neither. It is zero.


Wrong. It is overflow.

| Is 0x7fff+2 positive or negative?

Positive overflow.

| Is 0x8000 positive or negative?

That was my question.
Awww....1000 0000 0000 0000 isn't -0 anymore?


It is not on 2-s complement machines, that is on almost *all* machines
currently running. It is -32768.

| It's the highest positive integer that can be crammed into
| 16 bits, given current sign conventions.

Exactly, right. Given current sign conventions, there is a -zero.


Exactly wrong. Given current sign conventions there is no -zero.
When did you retire precisely?
--
dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131
home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/
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