On 2019-03-30 18:54:00 +0000, mark lewis -> Maurice Kinal said:
>
>
>                      integer types
>    Type      Range                                     Bytes
>    =========================================================
>    Longint   -2147483648 .. 2147483647                     4
>    Longword  0..4294967295                                 4

FYI ... this is why PCBoard used Microsft C's Single... signed long broke at
2.1 billion. Masking it to Single, allowed them to exceed it - however,
translators for other compilers could move bytes around from MS-Single ->
Pascal Real, but with a cap of 16,700,000 [as MSB defaulting to set in MS C's
storage limited it to 16.7 million].

Now, a trick I have been doing in the 16bit compiler is using 8 byte [double]
on disk storage - it is bit for bit compatible with 32bit compiler's Int64
(signed). [again MSB is not compatible - but ignoring it - I have ported PCB
RIME feeds for 18 years into a single file without corruption. But, RIME died
when CDC screwed everyone...

>
> Free Pascal does automatic type conversion in expressions where
> different kinds of integer types are used.
>
>                         real types
>    Type      Range                Significant digits   Bytes
>    =========================================================
>    Real      platform dependent       ???             4 or 8
>    Single    1.5E-45 .. 3.4E38        7-8                  4
>    Double    5.0E-324 .. 1.7E308     15-16                 8
>    Extended  1.9E-4932 .. 1.1E4932   19-20                10

FYI - talking with Florian and Jonas, Extended is not supported on Windows 10
64bit (per Microsoft). * I could not find reference to it, but, if Florian
tells me something of this nature, I accept it. I had to redesign a lot of
things that used to support Extended.

Ozz

-- 
.. Ozz Nixon
... Author ExchangeBBS (suite)
.... Since 1983 BBS Developer

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