Test if String is a Number

[Lope 0]

I know this is a seemingly retarded question. But I've checked the manual, I've googled, and I've searched the forum.

I've tried IsInt and IsNumber and @error.

$foo='45'

Messagebox(0,'',Int($foo)) ; returns 45

Messagebox(0,'',@error) ; returns 0, ok, thats expected...

$foo='dfgfdg'

Messagebox(0,'',Int($foo)) ; returns 0

Messagebox(0,'',@error) ; returns 0 < huh?

$foo='45'

Messagebox(0,'',IsNumber($foo)) ; returns 0... (not a numeric type)

how does one check if a string converts completely to a number without errors?

Edited September 3, 2011 by Lope

[Rogue5099 16]

Checks if a string contains only digit (0-9) characters.

StringIsDigit ( "string" )

StringIsDigit("12333") ;returns 1
StringIsDigit("1.5") ;returns 0 due to decimal point
StringIsDigit("1 2 3") ;returns 0 due to whitespace
StringIsDigit("") ;returns 0

Edited September 3, 2011 by rogue5099

[UEZ 972]

Try Number():

$w = Number(1+2+10) ;returns 13
MsgBox(262144,'Debug line ~' & @ScriptLineNumber,'Selection:' & @lf & '$w' & @lf & @lf & 'Return:' & @lf & $w) ;### Debug MSGBOX
$x = Number("3.14") ;returns 3.14
MsgBox(262144,'Debug line ~' & @ScriptLineNumber,'Selection:' & @lf & '$x' & @lf & @lf & 'Return:' & @lf & $x) ;### Debug MSGBOX
$y = Number("24/7") ;returns 24
MsgBox(262144,'Debug line ~' & @ScriptLineNumber,'Selection:' & @lf & '$y' & @lf & @lf & 'Return:' & @lf & $y) ;### Debug MSGBOX
$z = Number("tmp3") ;returns 0
MsgBox(262144,'Debug line ~' & @ScriptLineNumber,'Selection:' & @lf & '$z' & @lf & @lf & 'Return:' & @lf & $z) ;### Debug MSGBOX

Br,

UEZ

[Bowmore 82]

This is a function that I wrote some time ago the identifies if a value is a number.

[Jon 794]

I know this is a seemingly retarded question. But I've checked the manual, I've googled, and I've searched the forum.

I've tried IsInt and IsNumber and @error.

$foo='45'

Messagebox(0,'',Int($foo)) ; returns 45

Messagebox(0,'',@error) ; returns 0, ok, thats expected...

You can't use @error like that. @error is being set by the first MessageBox so will always be 0 in this case.

[MvGulik 86]

mmm. "... (re)set first by the MessageBox() call itself so ..."

Edited September 3, 2011 by iEvKI3gv9Wrkd41u

[SmOke_N 193]

Roll your own:

Func _StringIsNumber($v_num)
    Return (Int(StringIsInt($v_num)) + Int(StringIsFloat($v_num)) > 0)
EndFunc