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convert string to number

Posted on 2002-04-25
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Last Modified: 2012-05-04
in vbscript
how can I convert string to Number
and if the string is invalid number format how can check that with before the program breaked
with examples
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Question by:Elnazear
6 Comments
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 50 total points
ID: 6968065
Either:

 if IsNumeric(yourstring) then
   .. <yourcode>
 end if

or

Sub ...
dim lngValue as long
on error goto ErrInvalidNumber
lngValue = clng(yourstring)

Exit sub

ErrInvalidNumber:
  <error handling>
Exit Sub

End Sub

CHeers
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LVL 13

Expert Comment

by:crazyman
ID: 6968110
i always use

dim lngMyValue as long

lngMyValue = clng(val("yourstring"))
lngMyValue will be 0 if the string is invalid
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LVL 3

Expert Comment

by:n_narayanan
ID: 6968336
You can also simply use val function,

dim numvalue as integer

numvalue = val("yourstring")

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LVL 18

Expert Comment

by:mdougan
ID: 6968575
That's a trick question.  In VBScript, there are no number datatypes, just variants (ok, you can have a variant that is a type variant/integer or something like that). You can't dim something as long or integer in VB script.

As suggested above, if you need to pass a string as a particular datatype, say to an external vb component or something, then you can use the conversion functions like
CLng(), CInt() etc.

I'd suggest never using the Val statement as suggested.  Val has the following quirks:

Val("555-1212") gives you 555

Val("59.95") gives you 59

Val("1,000,000") gives you 1

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LVL 75

Expert Comment

by:Anthony Perkins
ID: 6968697
mdougan,

There is no Val function in VBScript. Probably because it does not support regional locales.

Anthony
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LVL 18

Expert Comment

by:mdougan
ID: 6970031
<grin>
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