Visual Basic 2005 in a Nutshell, Third Edition

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Chapter 4: Variables and Data Types

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

where accessModifier is one of the access modifiers defined earlier. (Access modi-

fiers are not used for constants declared in procedures.) When

Option Strict is On,

all constant declarations must have a declared type.

Enumerations

An enumeration appears as a group of related integer constants. All members of an

enumeration share the same data type, and it must be an integral data type (

Byte,

Integer, Long,orShort, and also—in 2005 or beyond—SByte, UInteger, ULong,or

UShort). The enumeration members are shared and read-only for the lifetime of

the application.

Public Enum VehicleType As Integer

bicycle = 2

tricycle = 3

passengerCar = 4

eighteenWheeler = 18

End Enum

They are used in code just like constants or variables.

Dim whatIDrive As VehicleType

whatIDrive = VehicleType.passengerCar

Enumerations are declared at the namespace or module level only; you cannot

define an enumeration within a procedure.

Arrays

The array is a fundamental data structure in many programming languages,

including Visual Basic. Arrays store a collection of similar data types or objects.

Each element has a numbered position, ranging from 0 (the lower bound) to the

defined upper bound of the array.

The following examples show various ways to declare a one-dimensional array:

' Implicit ...