This is what they have in help:
Variant Data Type
The Variant data type is the data type for all variables that are not
explicitly declared as some other type (using statements such as Dim,
Private, Public, or Static). The Variant data type has no type-declaration
character.
A Variant is a special data type that can contain any kind of data except
fixed-length String data. (Variant types now support user-defined types.) A
Variant can also contain the special values Empty, Error, Nothing, and Null.
You can determine how the data in a Variant is treated using the VarType
function or TypeName function.
Numeric data can be any integer or real number value ranging
from -1.797693134862315E308 to -4.94066E-324 for negative values and from
4.94066E-324 to 1.797693134862315E308 for positive values. Generally,
numeric Variant data is maintained in its original data type within the
Variant. For example, if you assign an Integer to a Variant, subsequent
operations treat the Variant as an Integer. However, if an arithmetic
operation is performed on a Variant containing a Byte, an Integer, a Long,
or a Single, and the result exceeds the normal range for the original data
type, the result is promoted within the Variant to the next larger data
type. A Byte is promoted to an Integer, an Integer is promoted to a Long,
and a Long and a Single are promoted to a Double. An error occurs when
Variant variables containing Currency, Decimal, and Double values exceed
their respective ranges.
You can use the Variant data type in place of any data type to work with
data in a more flexible way. If the contents of a Variant variable are
digits, they may be either the string representation of the digits or their
actual value, depending on the context. For example:
Dim MyVar As Variant
MyVar = 98052
In the preceding example, MyVar contains a numeric representation-the actual
value 98052. Arithmetic operators work as expected on Variant variables that
contain numeric values or string data that can be interpreted as numbers. If
you use the + operator to add MyVar to another Variant containing a number
or to a variable of a numeric type, the result is an arithmetic sum.
The value Empty denotes a Variant variable that hasn't been initialized
(assigned an initial value). A Variant containing Empty is 0 if it is used
in a numeric context and a zero-length string ("") if it is used in a string
context.
Don't confuse Empty with Null. Null indicates that the Variant variable
intentionally contains no valid data.
In a Variant, Error is a special value used to indicate that an error
condition has occurred in a procedure. However, unlike for other kinds of
errors, normal application-level error handling does not occur. This allows
you, or the application itself, to take some alternative action based on the
error value. Error values are created by converting real numbers to error
values using the CVErr function.
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type variant in a module, highlight it and hit F1.
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Regards,
Tom Ogilvy
