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From: Maciej MACOWICZ <Maciej.Macowicz@cern.ch>
Subject: Re: constant & private attributes
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Walid Al-Ahmad wrote:
> 
> Hello evreybody,
> 
> I have the following two questions for which I do not, directly, find
> answer in the book of Madsen et al. :
> 1) How can I define constant (integer, real, ..) attributes in Beta ?
> How is PI defined in the math library for example ?
Yes, you can define the constants, eg: 
	PI:(# exit 3.14159 #)


> 2) Is it possible to manipulate attributes outside the pattern ? Are
> they read-only variables like Eiffel's attributes ? Can I do something
> like this :
> A : (# x :@integer; ... #)
> a : @A; 3->a.x
             |||
You can, it is correct.


Hope this helps

Cheers

Maciej

-- 
______________________________________________________________________
Maciej Macowicz         CERN, ECP/ALD         phone: (41) 22 767 23 82