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Additional info for Accelerated VB 2008 (Accelerated)
ToString) End Sub End Class If you run this code, you’ll see the following output: Color is Red This code actually uses the name of the enumeration rather than the ordinal value 0. Enum type’s implementation of the ToString method, which returns the color’s name. ■Note The underlying type of the Enum must be an integral type that is one of the following: Byte, SByte, Short, UShort, Integer, UInteger, Long, or ULong. When referring to Enum members, you precede the member name with the Enum name.
Else, that are used to control the flow of your program. This section is an overview of those constructs. If . . Then . . Else The conditional construct If . . Then . . Else first checks an expression that must resolve to a Boolean value. Then based on that value, the statements that you specify are executed. qxp 30 1/8/08 4:19 PM Page 30 CHAPTER 2 ■ VB 2008 SYNTAX If x = 0 Then y = 1 End If You can also write this on a single line, although from a stylistic point of view, it is less readable, and as soon as you need to add more statements, you’ll need a corresponding End If: If x = 0 Then y = 1 If the first If condition evaluates to False, the program flow will go to the first ElseIf condition and evaluate it.
In the following snippet, you’ll receive a compiler error on the last line because the variable VarUndeclared is not declared anywhere. If Option Explicit was Off, both the variables VarDeclared and VarUndeclared would be valid. When this code compiles, VB will define VarUndeclared as type Object until it’s assigned, at which point it will implicitly convert it to a Double because of its data assignment: Option Explicit On . . qxp 1/8/08 4:19 PM Page 13 CHAPTER 2 ■ VB 2008 SYNTAX Option Strict: The Option Strict setting is related to any implicit data conversions that VB performs on variables.