B4J Question isNumber("1f") =>> TRUE !!

[Tayfur]

I looked a n interesting result with "isnumber" function.
"1f" and "1d" returned TRUE !!!!
why?

If IsNumber("1f") Then Log("f")' return f
If IsNumber("ff") Then Log("a")'------
If IsNumber("1ff") Then Log("a")'------
If IsNumber("1f1") Then Log("a")'------
        If IsNumber("1e") Then Log("e")'------
        If IsNumber("1d ") Then Log("d") ' return d
        If IsNumber("1c") Then Log("c")'------
        If IsNumber("1b") Then Log("b")'------
        If IsNumber("1a") Then Log("a")'------

 

[moster67]

Probably float and double literals. In Java you can use the suffix "d" or "f" to enforce double or float respectively...
http://stackoverflow.com/questions/4331200/what-do-f-and-d-mean-at-the-end-of-numeric-literals

 

[Tayfur]

Probably float and double literals. In Java you can use the suffix "d" or "f" to enforce double or float respectively...
http://stackoverflow.com/questions/4331200/what-do-f-and-d-mean-at-the-end-of-numeric-literals

my code broke for this issue (
how can i fix it? it has a different verison or parameter (isNumber)?

I want to simple check for number.

 

[moster67]

Try something like this:

Dim x As String = "1d"
 
    If IsNumber(x) Then
        Log("is number")
        'double-check
        If x.EndsWith("D") Or x.EndsWith("d") Or x.EndsWith("F") Or x.EndsWith("f") Or x.EndsWith("L") Or x.EndsWith("l") Then
            Log("not a number")
        End If
    Else
       'no number
    End If

Also "L" or "l" can be used in Java to indicate long (normally capital letter "L" is used since the non capital letter "l" can be confused with the number one (1)

There may be better solutions...

 

[Erel]

Sub TestNumber(s As String) As Boolean
   Return IsNumber(s) And Regex.IsMatch("[\d\.]+", s)
End Sub