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Re: IIGS SANE Bugs and Quirks

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On 12/21/2021 8:37 PM, Stephen Heumann wrote:

> * FX2L and FX2C can yield the wrong value for certain negative
> integers (e.g. -2147483648). I think the numbers affected are
> negative integers that have zeros in at least the bottom 16 bits (in
> two’s-complement representation). For such numbers, the errors occur
> fairly frequently but not always. They seem to occur even more
> commonly (maybe always) if the bottom 32 bits are zero. This only
> seems to affect integer inputs, not non-integer numbers that round to
> such integers.
> 

Stephen,

For some reason the math error and specifically the number 2147483648 
struck a memory I had about a similar issue with UltraMacros for AppleWorks.

I finally found that it was referenced in Joe L. Walter's UltraMacros 
Reference Manual. I've quoted it below, but don't really know if it will 
be of any help to you. If not, please disregard.

> 
> The extended math commands allow 26 special Ultra 4 variables to 
> handle numbers ranging from negative 21 million to positive 21 
> million with up to two decimal places.

> This allows you to calculate financial transactions without needing
> the spreadsheet, or to do any other math which is beyond the range of
> Ultra's normal 0-65535 limits.

> One limitation is that the result of a multiplication or division can
> not exceed 214,748.36, at least if you want an accurate answer.
> Additions and subtractions work all the way up to the maximum value.
> Multiplications and divisions are limited because of the need to
> maintain two decimal place accuracy.

> Ed: Because of this "limitation" for multiplication or division I 
> would hesitate to use these extended math commands unless I knew for 
> sure that there was no chance my data could exceed the limitation. 
> Practice safe Hex, create a spreadsheet and do the calculations 
> there. 

> Here are the ranges. (The second columns have commas to make the
> numbers more readable, but you can't use commas in your macros. You
> must write the numbers as they appear in the first columns of each
> group.)

>       Extended Variables       Normal Ultra 4 (integers only)
> --------------------------------------------------------------
 >
>  Lowest:  -21,474,836.47               0 
> Highest:   21,474,836.47          65,535


What I don't understand is this -- supposedly the AppleWorks Spreadsheet 
doesn't suffer from these limitations, but I know for certain that it 
uses the SANE package.






Hugh Hood

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Thread

IIGS SANE Bugs and Quirks Stephen Heumann <stephen.heumann@gmail.com> - 2021-12-21 20:37 -0600
  Re: IIGS SANE Bugs and Quirks Hugh Hood <hughhood@earthlink.net> - 2021-12-22 23:15 -0600
    Re: IIGS SANE Bugs and Quirks fadden <fadden@fadden.com> - 2021-12-23 08:01 -0800
    Re: IIGS SANE Bugs and Quirks Stephen Heumann <stephen.heumann@gmail.com> - 2021-12-23 16:10 -0600

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