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Re: 31000 + 3000 = -31536 (What is this!) [message #308]

Mon, 29 June 1992 01:59

wu
Messages: 3
Registered: June 1992

Junior Member

In article <1992Jun28.173438.17167@ucsu.Colorado.EDU> Ferhat F. Hatay
(hatay@spot.Colorado.EDU) writes ...
>
> IdlMaster>print, 31000 + 3000
> -31536
>
The problem here is that: IDL treats the two numbers just as "short integer".
We can see it with
IDL> help, 31000 + 3000
<Expression> INT = -31536.

In this case, you can declare the number as a long integer. Now you will have
the right result:
IDL> help, 31000L + 3000
<Expression> LONG = 34000

Xiangchen Wu
email: wu@ipesun.e-technik.uni-stuttgart.de

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