B4R Question Convert Ulong to string

janderkan · Feb 17, 2018

I read the time from a string to a Ulong.
I calculate the elapsed time as a Ulong.
I calculate newtime as Ulong = time + elapsed.
All works fine, but when I use Numberformat(newtime,1,0) to convert to string there is an error.

If I repeatedly call the sub the calculated newtime is correct
but newtime converted to string is always the same.

Test project attached.

janderkan · Feb 17, 2018

Both a Double and a Ulong are 4 bytes.
Maybee my Ulong value is to large for a Double?
I created my own UlongFormat, is there a better way?

B4X:

Sub UlongFormat(Value As ULong) As String
    Dim digits(10) As Byte
    For count = 0 To 9
        digits(count) = Value / Power(10,9-count)
        Value = Value - digits(count) * Power(10,9-count)
        digits(count) = digits(count)+48
    Next
    Return BC.StringFromBytes(digits)
End Sub

Erel · Feb 18, 2018

The problem is indeed with the implicit conversion to double when you call NumberFormat. It is possible to create a more efficient solution than the one you posted however it will not have any real advantage in this case.

B4R Question Convert Ulong to string

janderkan

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janderkan

Well-Known Member

Erel

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B4R Question Convert Ulong to string

janderkan

Well-Known Member

Attachments

janderkan

Well-Known Member

Erel

B4X founder

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