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Logical Operators (VB.Net and ASP Classic Cross Reference Guide)

By Mike Prestwood

VB.Net versus ASP Classic: A side by side comparison between VB.Net and ASP Classic.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Logical Operators

[Other Languages]

Languages Focus

Logical operators perform conditional and, or, and not operations. Some languages support both binary logical operators that link two and unary logical operators negate (make opposite) the truth value of its argument. Finally, some languages short circuit logic. For example, with this or that, if this is an expression returning true, then that is never executed.

VB.Net:

VB.Net logical operators:

And	and, as in this and that	No Short Circuit
AndAlso	and, as in this and that	short circuits
Or	or, as in this or that	No Short Circuit
OrElse	or, as in this or that	short circuits
Not	Not, as in Not This
Xor	either or, as in this or that but not both

Syntax Example: 1 certification question.

'Given expressions a, b, c, and d:

If Not (a and b) and (c or d) Then

  'Do something.

End If

ASP Classic: and, or, not

Same as VB. ASP Classic logical operators:

and	and, as in this and that
or	or, as in this or that
Not	Not, as in Not This

ASP Classic never short circuits. Given the expression this or that as well as this and that, if this evaluates to false, then that is still executed.

Syntax Example:

'Given expressions a, b, c, and d:

If Not (a and b) and (c or d) Then

  'Do something.

End If

ASP Classic Logical Operators (and, or, not) 2 certification questions.