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Re: Strange Bug with numeric double constants [message #14709 is a reply to message #14700]

Mon, 22 March 1999 00:00

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Alex Schuster wrote:

> Hi!
>
> I just experienced some weird IDL behaviour:
>
> IDL> help, 1.0d+2.0d
>
> help, 1.0d+2.0d
> ^
> % Syntax error.
> IDL> help, 1d+2d
>
> help, 1d+2d
> ^
> % Syntax error.
>
> Strange, isn't it? There's no problem with byte constants:
>
> IDL> help, 1b+2b
> <Expression> BYTE = 3
>
> An additional blank helps:
>
> IDL> help, 1d +2d
> <Expression> DOUBLE = 3.0000000
>
> I didn't try IDL 5.2, but it happened with 4.0 and 5.1 on Unix and
> Windows. I guess IDL expects an exponential notation like 1d0, and is
> confused by the nonnumeric plus character.
>
> Alex
> --
> Alex Schuster Wonko@weird.cologne.de PGP Key available
> alex@pet.mpin-koeln.mpg.de

If you look to the exponent definition it isn't strange because
help, 1d+2
<Expression> DOUBLE = 100.00000

It isn't allowed to use the D to define double more than once in a
definiton of a number.

If you won't use blank to separate the numbers you can use ()

help, (1d)+(2d)
<Expression> DOUBLE = 3.0000000

R.Bauer

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[Message index]

		Re: Strange Bug with numeric double constants By: thompson on Mon, 22 March 1999 00:00
		Re: Strange Bug with numeric double constants By: Martin Schultz on Mon, 22 March 1999 00:00
		Re: Strange Bug with numeric double constants By: R.Bauer on Mon, 22 March 1999 00:00

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