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From: zhou@brazil.psych.purdue.edu (Albert Zhou)
Newsgroups: comp.lang.pascal
Subject: Re: SET
Message-ID: <11567@j.cc.purdue.edu>
Date: 26 Nov 90 16:40:52 GMT
References: <25092@adm.brl.mil>
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Reply-To: zhou@brazil.psych.purdue.edu (Albert Zhou)
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In article <25092@adm.brl.mil> PRDESENV%ORION.CPQD.ANSP.BR@uga.cc.uga.edu writes:
>Hey,
>
>        Does anybody know how can I build a SET with Real (or double)
>elements in Turbo Pascal? I Only need a SET with 15 real numbers.

	There is no directly way of doing it in TP. But you can map these
15 reals to 0..14 and subsequently define a set of byte [0..14].
>
>        Once SET requires subranges with no more than 256 itens I can not
>make a set of word (my real numbers have only one place after
>the decimal point, so I could multiply by 10, solving the problem, but
>the range from the first to the last overcome 256).
It looks like you need to do certain non-linear transform so that you can map
no more than 255 reals or integers into a set of byte (Multiplying by 10 is
a kind of transform or mapping if you haven't aware, very simple linear 
transform though).

>
>        I've tried to make a TYPE with these numbers but Turbo gives an
>error saying "Error 2: Identifier expected" .

	As I remember, you can make subrange out of BYTE, CHAR, INTEGER and 
WORD (They are all ordinal). But you cannot make subrange out of REAL.