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Re: print, long(1.0e10) [message #16660 is a reply to message #16541]

Mon, 09 August 1999 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

Gary Fu <gfu@seadas.gsfc.nasa.gov> writes:

> 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 ?

It appears that Digital Unix gives yet another answer:

IDL> a = 1.0e10
IDL> b = long(a)
% Program caused arithmetic error: Floating illegal operand
IDL> print, b
1410065408

which makes sense, since that's A modulo 2^32.

William Thompson

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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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