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From: lutz@iks-jena.de (Lutz Donnerhacke)
Newsgroups: comp.lang.ada
Subject: Re: if X in 1..35000 versus Boolean
Date: Tue, 16 Jul 2002 11:13:26 +0000 (UTC)
Organization: IKS GmbH Jena
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* Jan Prazak wrote:
>On Tue, 16 Jul 2002 07:18:54 -0100, Keith Thompson wrote:
>> I think you're thinking of Pascal sets, not enumeration types.  Ada
>> doesn't have built-in set types, though they're easy enough to
>> implement.
>> 
>> If I recall correctly (it's been a while), in Pascal you can write
>> something like:
>> 
>>     if X in [1 .. 4] then (* This is Pascal, not Ada *) begin
>>         ...;
>>     end;
>> 
><snip>
>
>Yes! That's exactly what I meant, but I gave it only another name.
>Then I haven't misunderstood something, it just doesn't exist in Ada.

with Ada.Text_IO;
use Ada.Text_IO;

procedure t is
   type Offset is range 0 .. 20;
   package NIO is new Ada.Text_IO.Integer_IO (Offset);
   use NIO;
   x : Offset;
   testfeld : array (Offset) of Boolean :=
     (1..4 => True, others => False);
begin
   Put ("Enter a number: ");
   Get (x);      
   if testfeld (x) then
      Put_Line ("True");
   else
      Put_Line ("False");
   end if;
end t;