VBScript in a Nutshell, 2nd Edition

Name

CDbl Function

Syntax

CDbl(expression)

expression

Use: Required

Data Type: Numeric or String

-1.79769313486232E308 to -4.94065645841247E-324 for negative values; 4.94065645841247E-324 to 1.79769313486232E308 for positive values.

Return Value

expression cast as a Double type.

Description

Converts expression to a Double type.

Rules at a Glance

• If the value of expression is outside the range of the double data type, an overflow error is generated.

• Expression must evaluate to a numeric value; otherwise, a type mismatch error is generated.

Example

Dim dblMyNumber as Double
If IsNumeric(sMyNumber) then
    dblMyNumber = CDbl(sMyNumber)
End If

Programming Tips and Gotchas

Use IsNumeric to test whether expression evaluates to a number.

See Also

IsNumeric Function