numberformat question

[Craig Newman]

Check out this thread in the forum:

https://forums.livecode.com/viewtopic.php?f=7&t=25132&p=130985&hilit=longadd#p130985 <https://forums.livecode.com/viewtopic.php?f=7&t=25132&p=130985&hilit=longadd#p130985>

Craig

> On Mar 21, 2021, at 7:34 AM, jbv via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Paul, Sean,
> 
> Thank you both for your answers, although it doesn't really solve my problem.
> The most surprising thing is that javascript runs these calculations without
> problem :
> (-0.0000007347880794884118999 / 1000000000) returns -7.347880794884119e-16
> (-0.0000007347880794884118999 / 1000000000000) returns -7.347880794884119e-19
> 
> Best
> 
> 
> Le 2021-03-21 07:11, Sean Cole (Pi) via use-livecode a écrit :
>> Livecode can handle floating point numbers up to 2^52. But then
>> calculations would have to fit within that range in a floating point
>> perspective too. So, once you add that ninth zero to the end of your
>> divider, it struggles with the calculation and returns, effectively, number
>> out of range.
>> Fractions in FP binary are tremendously complicated. Calculation in it are
>> even more so.
>> https://www.h-schmidt.net/FloatConverter/IEEE754.html
>> On Sat, 20 Mar 2021 at 20:23, Paul Dupuis via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>>> I don't have an answer, other than to say there has been a LOT of
>>> discussion over the years about the limits of number precision in
>>> LiveCode and a number of enhancement requests and 3rd party libraries
>>> that have attempted to provide a framework for high precision math. You
>>> might search the list archives or search the forum on the LC web site
>>> for past discussions about number precision.
>>> On 3/20/2021 3:06 PM, jbv via use-livecode wrote:
>>> > Hi list,
>>> > I am a bit lost :
>>> >
>>> >    set numberformat to ".#########################"
>>> >    put -0.0000007347880794884118999 / 1000
>>> > -- returns -0.0000000007347880794884119  which is ok
>>> >
>>> >    put -0.0000007347880794884118999 / 1000000
>>> > -- returns -0.0000000000007347880794884 -> also ok
>>> >
>>> >    put -0.0000007347880794884118999 / 100000000
>>> > -- returns -0.0000000000000073478807949 -> still ok
>>> >
>>> >    put -0.0000007347880794884118999 / 1000000000
>>> > -- returns 0 -> ?????
>>> >
>>> > Any explanations ?
>>> > Thanks in advance.
>>> > Best,
>>> > jbv
>>> >
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