CDBL

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgCdbl
• Last revised: 2016-03-12

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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

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.

Examples

start GeSHi

' 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

end GeSHi

Differences from QB

• The string argument was not allowed in QB

See also

• Cbyte
• Cubyte
• Cshort
• Cushort
• Cint
• Cuint
• Clng
• Culng
• Clngint
• Culngint
• Csng

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