Prestwood IT: ASP Classic Logical Operators (and, or, not) (ASP Classic Coding)

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From the May 2014 Issue of Prestwood eMag

ASP Classic Language Basics:

ASP Classic Logical Operators (and, or, not)

By Mike Prestwood

Posted 15 years ago on 2/11/2009 and updated 9/15/2009

ASP Classic Code Snippet:

To/From Code Guide: ASP Classic Logical ... vs. Other Languages

A flashcard from our ASP Classic Flashcards Library

A code snippet from our ASP Classic Code Snippets Page

Tags: ASP Classic , Logical Operators

KB101891

Languages Focus: Logical Operators

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.

ASP Classic Logical Operators

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 Short Circuting Example:

In the following example, if ASP Classic supported short circuting, the That function would never execute. It's interesting to note that VB.Net has introduced two new operators to support short cicuiting: AndAlso and OrElse for use when you code in ASP.Net.

<%@LANGUAGE='VbScript'%>
<%Option Explicit%>

<html>

<body>
<h1>Short Circuting</h1>
<%
Function This()
    Response.Write("<br>The This function executed.")
    This = False
End Function

Function That()
    Response.Write("<br>The That function executed!")
    That = True
End Function

'Notice both the This and That functions execute
'even though the This Function returned False.
If This And That Then
  Response.Write("<br>Both are true.")
End If
%>
</body>

</html>

More Info

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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Linked Certification Question(s)

The following are practice certification questions with answers highlighted. These questions were prepared by Mike Prestwood and are intended to stress an important aspect of this KB post. All our practice questions are intended to prepare you generally for passing any certification test as well as prepare you for professional work.

Beginner

1 Beginner Level Question

Question #1: True or False?

Given the following code, will True or False be written?

Dim a, b, c, d
  
a = True
b = True
c = True
d = False  
  
If Not (a And b) And (c Or d) Then
  Response.Write("True")
Else
  Response.Write("False")
End If

Answer:

True

False

Intermediate

1 Intermediate Level Question

Question #2: Yes or No?

Given the following two functions:

Function This()
    This = False
End Function

Function That()
    That = True
End Function

Will the That function in the following code execute?

If This And That Then
  Response.Write("<br>hello.")
End If

Answer:

Yes

KB Article #101891 Counter

35515

Since 2/11/2009