Why isnumeric return true?

[Lasse Edsvik]

Hello

one question........ why does isnumeric return true?

a=""
if isnumeric(a) then
response.write("test")
end if

empty isnt numerical is it??
TIA
/Lasse

[Manohar Kamath]

Because, the numeric equivalent of a empty string is a numeric zero (not a
string "0").

Historial perspective:
If you know C programming language, the string is always terminated by a
numeric zero (not a string zero). That way, the runtime knows where the
string ends -- since the string is essentially a space in memory.

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Lasse Edsvik" <la***@nospam.com> wrote in message
news:Ok**************@TK2MSFTNGP11.phx.gbl...

Hello

one question........ why does isnumeric return true?

a=""
if isnumeric(a) then
response.write("test")
end if

empty isnt numerical is it??
TIA
/Lasse

[Ray Costanzo [MVP]]

What version of the Windows Scripting Host do you have installed? That does
not return true for me with version 5.6.

Also, IsNumeric is less than perfect, unfortunately. Check out the caveats
here. (Halfway down the page at the VBScript/Javascript section)
http://www.aspfaq.com/show.asp?id=2390

Ray at work
"Lasse Edsvik" <la***@nospam.com> wrote in message
news:Ok**************@TK2MSFTNGP11.phx.gbl...

Hello

one question........ why does isnumeric return true?

a=""
if isnumeric(a) then
response.write("test")
end if

empty isnt numerical is it??
TIA
/Lasse

[David Morgan]

Yes, you're better off checking the string is only made up of 0 - 9 as
ABCDEF are numeric also.

E.G. 5F

Regards

David
"Ray Costanzo [MVP]" <my first name at lane 34 dot commercial> wrote in
message news:uc****************@TK2MSFTNGP10.phx.gbl...

What version of the Windows Scripting Host do you have installed? That does not return true for me with version 5.6.

Also, IsNumeric is less than perfect, unfortunately. Check out the caveats here. (Halfway down the page at the VBScript/Javascript section)
http://www.aspfaq.com/show.asp?id=2390

Ray at work
"Lasse Edsvik" <la***@nospam.com> wrote in message
news:Ok**************@TK2MSFTNGP11.phx.gbl...

Hello

one question........ why does isnumeric return true?

a=""
if isnumeric(a) then
response.write("test")
end if

empty isnt numerical is it??
TIA
/Lasse