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Re: Basic Math: I _hope_ this is a stupid question [message #43754 is a reply to message #43752]

Wed, 27 April 2005 09:26

Geoff Cureton
Messages: 4
Registered: May 2000

Junior Member

Ed Hyer wrote:

> IDL> print,288*180
> -13696
> IDL> print,long(288*180)
> -13696
> IDL> print,ulong64(288*180)
> 18446744073709537920
> IDL> print,288.*180
> 51840.0
>
> I just want to multiply two integers! Is that so wrong?

What about appending "L" to the integers to make sure they are of type
long integer. Thus...

IDL> print,288L*180L
51840

Like someone wrote, your ints must be cast as long int *before* the
computation, so it is done with long int arithmetic. Trying to cast
the result as long int afterwards won't work, the damage is done :-)

Hope this helps,
Geoff

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[Message index]

		Re: Basic Math: I _hope_ this is a stupid question By: MarioIncandenza on Wed, 27 April 2005 16:14
		Re: Basic Math: I _hope_ this is a stupid question By: Geoff Cureton on Wed, 27 April 2005 09:26
		Re: Basic Math: I _hope_ this is a stupid question By: btt on Mon, 25 April 2005 05:44
		Re: Basic Math: I _hope_ this is a stupid question By: David Fanning on Sun, 24 April 2005 14:48
		Re: Basic Math: I _hope_ this is a stupid question By: K. Bowman on Thu, 28 April 2005 06:15

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