ASP Quirk with Const

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June 5th, 2003, 07:46 AM

timzter

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Join Date: Jun 2003

Posts: 63

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ASP Quirk with Const

Seems like I stumbled on an ASP quirk, or I am missing something. Given the following ASP code:

<html>
<body>
<%
If FOOBAR Then
Response.Write "FOOBAR exists"
Response.End
End If

Const FOOBAR = 1
%>

ZZZ

</body>
</html>

I would expect ZZZ to be displayed since FOOBAR is _not_ defined to begin with. Instead the web browser displays "FOOBAR exists". Why?? ??

Note that if I change:

from:
Const FOOBAR = 1
to:
Const FOOBAR999 = 1

and leave the rest of the code the same, then the browser displays "ZZZ".

Is the 'Const' statement somehow read BEFORE the 'If' statement???? Please explain this quirk.

June 5th, 2003, 08:08 AM

imbrokn

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Join Date: Sep 2001

Location: NJ

Posts: 428

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I don't beleive that it is a quirk. When you define a variable with dim or constant, these are done as preprocessing directives. The compiler or whatever in ASP will check the code for errors like not dim variables if option explict is defined and shoot those errors beck before anything else.

June 5th, 2003, 09:39 AM

timzter

Contributing User

Join Date: Jun 2003

Posts: 63

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Reputation Power: 5

How then do I achieve the equivalent in C where I include the code only if it has not been included before:

#ifndef FOOBAR
#define FOOBAR

.... functions, code, etc. here....

#endif

I can't do:

<%
If Not FOOBAR Then
Const FOOBAR = 1

Sub X()
...
End
Function Y()
...
End
End If

since I can't define Subs and Functions inside the If/End block. So I thought I'd do:

If FOOBAR Then
Response.End
End If

Const FOOBAR = 1

Sub X()
...
End
Function Y()
...
End

But it seems that in this case, FOOBAR will always be defined because of the presence of the Const FOOBAR = 1 further down in the code and, as the previous guy said, it is treated as a preprocessor directive. So how do I come up with a way to simulate the #ifndef/#define/#endif in C/C++ to only include and process the code if it has not already been included and processed before?

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