CDbl

FreeBASIC

CDbl
 
Converts numeric or string expression to Double precision floating point

Syntax

Declare Function CDbl ( ByVal expression As datatype ) As Double

Type typename
End Type

Usage

result = CDbl( numeric expression )
result = CDbl( string expression )
result = CDbl( user defined type )

Parameters

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.

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


Differences from QB

  • The string argument was not allowed in QB

See also