CDblfunction

Converts numeric or string expression to Double precision floating point

Syntax

Declare Function CDbl ( ByVal expression As datatype ) As Double

Type typename

Declare Operator Cast ( ) As Double

End Type

Parameters

Name		Description
`expression`		a numeric, string, or pointer expression to cast to a `Double` value
`datatype`		any numeric, string, or pointer data type
`typename`		a user defined type

Return value

A Double precision value.

Description

The CDbl function returns a 64-bit Double value. The function does not check for an overflow, so be sure not to pass a value outside the representable range of the Double data type. The name can be explained as 'Convert to DouBLe'.

If the argument to CDbl is a string expression, it is first converted to numeric by using Val.

Remarks

Usage



result = CDbl( numeric expression )

result = CDbl( string expression )

result = CDbl( user defined type )

Differences from QB

The string argument was not allowed in QB

Example

' Using the CDBL function to convert a numeric value



'Create an DOUBLE variable

Dim numeric_value As Double



'Convert a numeric value

numeric_value = CDbl(-12345678.123)



'Print the result, should return -12345678.123

Print numeric_value

Sleep

Reference

Documented in KeyPgCdbl.html