1s' complement as in ... CDC?
(I used to program FORTRAN on CDC and had to deal with "Negative Zeroes".)
On 2020-04-23 11:37, Seymour J Metz wrote:
Real programmers use ones' complement ;-)
I don't know of any machine that uses a ten's complement representation, but
the idea is appealing.
--
Shmuel (Seymour J.) Metz
https://nam10.safelinks.protection.outlook.com/?url=http:%2F%2Fmason.gmu.edu%2F~smetz3&data=02%7C01%7C%7C7343764574a748ceaa7808d7e79c42af%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637232530624151412&sdata=O4UDTjodAoUB7pOFbMMf5Z8uwwixQnB6dSNu9XF0hpY%3D&reserved=0
________________________________________
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Paul Gilmartin [0000000433f07816-dmarc-requ...@listserv.ua.edu]
Sent: Thursday, April 23, 2020 10:21 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Here we go again;
On Thu, 23 Apr 2020 13:50:48 +0200, R.S. wrote:
It wasn't single byte per record in single table! It was (it *IS*)
element of some culture - to avoid dummy characters.
How many? It depends. For well constructed record the room for savings
is zero or close to zero.
For PFCSK ever date contains separators (2020-04-22 14:55:12), fields
are separated by blank etc.
I once wondered in these lists why, while F-type values wisely use
2's complement, P-type values are sign magnitude where 10's
complement would provide 5 times the range in the same storage
and avoid the need for a possible recomplement after subtraction.
The response seems to be that 10's complement representation of
negative values is unintuitive. That strikes me as PFCSK-think.
Of course, there's the argument about reading dumps.
-- gil
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