Android Question String to Float - inaccurate

[doncx]

When I convert a string with several decimal positions to a float, the value gets changed.

There must be a simple reason, but it is escaping me.

The code below logs two lines
12.34567 (the string value)
12.345669746398926 (the resulting float value)

How do I accurately convert a decimal string to a float value? I've tried various formatting methods and continue to get this result.

Dim str1 = "12.34567" As String
Dim num1 = 0 As Float
num1 = CNum(str1)
Log(str1)
Log(num1)

Sub CNum(str2cnvrt) As Float
    Return str2cnvrt
End Sub

 

[Mahares]

Dim str1 = "12.34567" As String
    'You can use it as is since it is numeric:
    Log(str1*1.5)  'displays 18.518505
   
    'or you can use this:
    Dim num1 As Double=str1
    Log(num1)  'displays 12.34567

 

[Erel]

A binary number (with limited length) cannot accurately represent 12.34567.

You can just ignore this inaccuracy. Always use NumberFormat (or the shortcut) to convert the number to string:

Dim num1 As Float = 12.34567
Log($"Num value: $1.5{num1}"$) 'shows at most 5 fraction digits

 

[doncx]

Ok, understood.

Thanks.