Converts a value of any data type to a Double value.

This function is similar to CDbl in Visual Basic.

The result of the conversion depends on the data type of Val, as follows:

The return value is 1.0 (True) or 0.0 (False).

The return value is equal to Val, with a fractional part of zero.

Val is returned unchanged.

The return value is the floating-point number used internally to represent the date.

The string is parsed according to the locale to extract the value. An error occurs if the string does not contain a properly formatted double.

An error occurs.

If the object has a default property, the value of that property is converted. Otherwise an error occurs.

If Val is NULL, the return value is 0.0.