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From: "robin" <robin_v@bigpond.com>
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Subject: Re: BINARY INTEGER
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Date: Wed, 19 Jul 2006 14:35:07 GMT
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glen herrmannsfeldt wrote in message <49qdnUCa5515tCDZnZ2dnUVZ_uqdnZ2d@comcast.com>...
>robin wrote:
>> glen herrmannsfeldt wrote in message ...
>
>(snip)
>
>>>PL/I definitely allows decimal,
>
>> Not for binary integers.
>
>I know of an IBM PL/I implementation that did FIXED DECIMAL using
>binary arithmetic.

So do I, but that's irrelevant. It's off-topic.

> I don't know why doing FIXED BINARY using
>decimal arithmetic would be any less legal.

General purpose computers need to have
fixed-point binary as one of the basic operatiions,
along with the logical operations.
    It follows that FIXED BINARY will be implemented
courtesy of fixed-point binary hardware.

>  Note that most
>implementations do FLOAT DECIMAL in binary.

That's because most hardware is float biunary, not float decimal.
But again, that's irrelevant.

>  The scaling operations
>required for fixed point operations with the radix point not immediately
>to the right of the least significant digit are a little easier in the
>appropriate base, but that isn't required.
>
>>>most likely even for FIXED BINARY variables.
>
>> Might have some trouble doing indexing and logical operations.
>
>There have been machines that did indexing in decimal.

Which?

>Logical operations are defined for BIT strings.

In a general pupose computer, logical operations
are defined in terms of operations on binary integers.

>  The conversion between
>FIXED BINARY implemented in decimal

Who is going to implement binary oiperations in decimal?

> and BIT strings would have to
>satisfy the language requirements, but otherwise should be legal.
>(As is the conversion of FIXED DECIMAL to BIT strings.)

Way off topic.