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Re: Commutativity of multiplication [message #50986 is a reply to message #50983]

Wed, 25 October 2006 13:42

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <ehoh6g$asc$1@naig.caltech.edu>, Sven Geier <sZgeier@calteZch.edZu>
wrote:

> There's something odd afoot with ULong variables (in 6.3) that isn't clear
> to me:
>
> IDL> help,f,g,h
> F LONG = 500
> G ULONG = 1
> H FLOAT = 1.00000
> IDL> help,f*h,h*f
> <Expression> FLOAT = 500.000
> <Expression> FLOAT = 500.000
> IDL> help,f*g,g*f
> <Expression> LONG = 500
> <Expression> ULONG = 500
>
>
> Is this a bug? A feature? Well-known gotcha? Obscure property? Recently
> added functionality? Vestigial peculiarity?
>
>
> - S

A little poking around in the docs revealed this:

Note : Signed and unsigned integers of a given width have the same precedence.
In an expression involving a combination of such types, the result is given the
type of the *leftmost* operand. (Emphasis in original.)

Ken Bowman

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[Message index]

		Re: Commutativity of multiplication By: JD Smith on Thu, 26 October 2006 10:47
		Re: Commutativity of multiplication By: JD Smith on Thu, 26 October 2006 10:37
		Re: Commutativity of multiplication By: Braedley on Thu, 26 October 2006 10:24
		Re: Commutativity of multiplication By: Foldy Lajos on Thu, 26 October 2006 01:26
		Re: Commutativity of multiplication By: JD Smith on Wed, 25 October 2006 16:09
		Re: Commutativity of multiplication By: David Fanning on Wed, 25 October 2006 15:33
		Re: Commutativity of multiplication By: Sven Geier on Wed, 25 October 2006 14:54
		Re: Commutativity of multiplication By: K. Bowman on Wed, 25 October 2006 13:42
		Re: Commutativity of multiplication By: David Fanning on Wed, 25 October 2006 13:54

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