Her er hvad der står i MSDN Library:
When Option Explicit appears in a module, you must explicitly declare all variables using the Dim, Private, Public, ReDim, or Static statements. If you attempt to use an undeclared variable name, an error occurs atcompile time.
If you don't use the Option Explicit statement, all undeclared variables are of Variant type unless the default type is otherwise specified with a Deftype statement.
Note Use Option Explicit to avoid incorrectly typing the name of an existing variable or to avoid confusion in code where thescope of the variable is not clear.
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