Android Question Extend number length in AHNumeric.Format (Double)

[LGS]

Hello everyone.

Format in the AHNumeric object, receives a value of type Double (~ 15 digits)

...
Dim data As String
    data = "9999999999999.99"      
    Log(nf.Format(data))                   'RESULT:       9.999.999.999.999,99 OK
    data = "99999999999999.99"     
    Log(nf.Format(data))                   'RESULT:      99.999.999.999.999,98 formatted and modified
    data = "999999999999999.99"    
    Log(nf.Format(data))                   'RESULT:   1.000.000.000.000.000 formatted and rounded
    data = "899999999999999999.99" 
    Log(nf.Format(data))                   'RESULT: 900.000.000.000.000.000 formatted and rounded
...

Sub SetFormatChars(Grouping As Char, DecimalSeparator As Char) As AHNumeric
    Dim loc As AHLocale
    loc.InitializeUS
    Dim jloc As JavaObject = loc
    jloc = jloc.GetField("myLocale")
    Dim nfs As AHNumeric
    nfs.InitializeNumber2(loc)
    Dim r As Reflector
    r.Target = nfs
    Dim dfs As JavaObject
    dfs.InitializeNewInstance("java.text.DecimalFormatSymbols", Array(jloc))
    dfs.RunMethod("setGroupingSeparator", Array(Grouping))
    dfs.RunMethod("setDecimalSeparator", Array(DecimalSeparator))
    Dim jo As JavaObject = r.GetField("mNumberFormat")
    jo.RunMethod("setDecimalFormatSymbols", Array(dfs))
    Return nfs
End Sub

When the formatted number is greater than 15 digits, it is rounded (modified)

Is there a way to use this function with numbers of 18 or more digits?

Thanks in advance...

 

[agraham]

No, about 15 digits is the limit of precision of a Double, as well as the fact that Doubles, being binary representations, cannot accurately represent non-integer decimal quantities. If you want more precision then try my https://www.b4x.com/android/forum/threads/bignumbers-library.9540/

 

[LGS]

Agraham, thank you for your support.

I really only need to format 2 decimal places and AHNumeric.Format does it when the number to be formatted is 15 digits
I would like to use AHNumeric.Format but with a greater length number (example 18 digits) and the formatted result not rounded

Thanks again for your time

 

[agraham]

I would like to use AHNumeric.Format but with a greater length number (example 18 digits) and the formatted result not rounded

You can't.

 

[LGS]

Ok.
I will have to find another way to format numbers with lengths greater than 15

Thank you

 

[agraham]

I will have to find another way to format numbers with lengths greater than 15

Beware the source of your numeric data. Anything other than Strings will likely not be capable of representing that level of precision.

 

[LGS]

I'll keep it in mind, thank you