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Re: Could you explain why this happen? [message #70706 is a reply to message #70705] Wed, 28 April 2010 10:06 Go to previous messageGo to previous message
David Fanning is currently offline  David Fanning
Messages: 11724
Registered: August 2001
Senior Member
Bryan writes:

> This may be a stupid question, but I really want to know why.
> Please, see below and explain. Thanks.
>
> IDL> print, 132*30
> 3960
> IDL> print, 132*30*10
> -25936
> IDL> print, 132*300
> -25936
> IDL> data1 = 132
> IDL> data2 = 300
> IDL> data3 = data1*data2
> IDL> print, data3
> -25936

Here is a clue. These are the same IDL commands in my IDL
session:

IDL> print, 132*30
3960
IDL> print, 132*30*10
39600
IDL> print, 132*300
39600
IDL> data1 = 132
IDL> data2 = 300
IDL> data3 = data1*data2
IDL> print, data3
39600

Probably the only difference between your IDL session and mine
is that I have this command in my IDL startup file:

compile_opt defint32

Why would that matter?

Cheers,

David


--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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