[GreenKeys] Polar relays anyone?

[Jones, Douglas W]

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From: tony.podrasky [tony.podrasky at gmail.com]
Sent: Thursday, May 14, 2015 8:31 PM
To: David Christ; Sheldon Daitch
Cc: Jones, Douglas W; Robert Jarratt; Greenkeys
Subject: Re: [GreenKeys] Polar relays anyone?

What do you add to a negative zero to arrive at a positive zero?
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The fact that positive and negative zero have differing
representations implies that you're using either a
signed magnitude notation or something like one's
complement binary.

In the 1's complement number system, adding
positive zero to positive zero produces positive zero,
and adding negative zero to negative zero produces
negative zero.  Adding negative zero to positive zero
(or visa versa) produces negative zero.

So, you can add negative zero to positive zero to get
negative zero, but there's nothing you can add to
negative zero to make positive zero.

Is that entirely clear?

                   Doug Jones
                   jones at cs.uiowa.edu