mms

Given that OP() is dimmed an Integer and XX() a Double

I can't understand why the CLng function is required in this line of code:

OP(i) = CInt(CLng(XX(i)))

You would think the one CInt would suffice.

rufen101

The only reason I see why Clng would be required, is if XX(i) is greater than 32,767 which is the maximum value for an Integer. The maximum value for a Long variable is 2,147,483,647.

OnErr0r

It shouldn't be. Btw, I'm sure you know.. but a double can easily exceed the maximum of an integer. CLng and CInt also round up over .5. Int or Fix might be better alternatives, if you need to truncate decimals.

mms

do you mean:

OP(i) = Int((XX(i))) and/or OP(i) = Fix((XX(i))) ??

I tried both of these, and both fail.


Only

OP(i) = CInt(CLng(XX(i)))

works...

but I don't understand why!


XX(i) should not contain values outside -32768 and + 32767,

but because of rounding there may be values like 32767.000005 etc

Iceplug

Have you tried
OP(i) = CInt(XX(i))?
Does that make things work or not?

mms

Program will crash with that line.

(That's what's confusing me!)

OnErr0r

I'd like to see some sample code/data.

Edit: btw, when you say int and fix "fail", can you be specific as to how they fail. Error number and description would be helpful.

mms

I will see if I can pull out the relevant code and some sample data
to emulate this.

I don't know the error number, and am not even sure if program
crashes on that line because the program will only run as an exe
and I don't know how to debug properly (I am searching net to see
if I can add error handling routine to write to log file).

What I am sure of, is that the program runs without problems using

OP(i) = CInt(CLng(XX(i)))

and crashes as soon as I change that line to

OP(i) = Int((XX(i)))

or any variant thereof.

I have a few other bugs in the program (they do not crash program
or anything) and I am wondering if this might be the root of that
problem. Since I don't understand what's exactly happening with
the data in that line of code, I can't be sure.

VBJoe

Why does your application only run as an executable? Methinks you have bigger problems than a buggy CAST operation.

mms

The program reads a CD-audio signal (so as to alter the signal) and
the IDE does not process the information fast enough.

The exe just barely does this processing quickly enough, but it
does manage.

mms

I found out why this works as it does.

To make the program run fast enough to do what it has to do,
I disabled all the error checking when compiling to exe.

Remove Integer Overflow Checks causes this behaviour,
VB must force the overflow value to an integer value with the
CInt(CLng(X)) combination.