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DefDbl Statement
Không ghi rõ ký tự hay từ khoá mà khai báo kiểu thì đặt kiểu biến mặc định, tùy theo một phạm vi chữ.

{DefBool|DefCur|DefDate|DefDbl|DefErr|DefInt|DefLng|DefObj|DefStr|DefSng|DefVar} {char|char-char}[,...]
char: Letter prefix that specifies default data type for variables.
char-char: Letter range prefixes that specify default data type for variables.
' Prefix definitions for variable types:
DefBool b
DefCur c,l-m
DefDate t
DefDbl f
DefErr e
DefInt i-k,N
DefLng x-z, D
DefObj U, o-R
DefSng w,a
DefStr s
DefVar V,g
Sub ExampleDefDBL
fValue=1.23e43 ' fValue is an implicit double variable type
Print Typename(float), VarType(fire), factory ' Result is: Double 5 0
End Sub