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Re: print, long(1.0e10) [message #16626 is a reply to message #16541]

Wed, 04 August 1999 00:00

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Gary Fu wrote:
> I got different results from the following example on SGI IRIX and PC
> Linux:
> a = 1.0e10
> b = long(a)
> print, b ; 2147483647 for IRIX, -2147483648 for Linux
>
> It looks like that IRIX and Linux handle it differently when assigning a
> floating value greater (or less) than the boundary of a long integer to
> a long variable. Should I always check the range of 'a' before
> assigning it to a 'long' variable to make the result consistent on IRIX
> and Linux ?

Gary,

I guess it depends on what you are trying to do. If you want to
interpret the binary representation of 1.0e10 as a 32-bit signed LONG,
then the syntax is

result = long(1.0e10, 0)

However if you want to represent 1.0e10 as an integer value, I think the
only option (other than a range check) is to use IDL 5.2, which allows
64-bit signed and unsigned integers, e.g.

result = long64(1.0e10)

Cheers,
Liam.

--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		print, long(1.0e10) By: Gary Fu on Tue, 03 August 1999 00:00
		Re: print, long(1.0e10) By: thompson on Wed, 04 August 1999 00:00
		Re: print, long(1.0e10) By: Liam Gumley on Wed, 04 August 1999 00:00
		Re: print, long(1.0e10) By: R.Bauer on Tue, 10 August 1999 00:00
		Re: print, long(1.0e10) By: luthi on Mon, 09 August 1999 00:00
		Re: print, long(1.0e10) By: thompson on Mon, 09 August 1999 00:00

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