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Newsgroups: comp.lang.ada
Subject: Re: do while loop help ( newbie)
References: <1139094979.043765.42770@g14g2000cwa.googlegroups.com>
 <1139104892.388202.308400@g14g2000cwa.googlegroups.com>
From: Stephen Leake <stephen_leake@acm.org>
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Date: Sun, 05 Feb 2006 07:18:41 -0500
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Date: 2006-02-05T07:18:41-05:00
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"jimmaureenrogers@worldnet.att.net" <jimmaureenrogers@worldnet.att.net> writes:

<snip>
>>    Number    : Natural range 0 .. 9999; -- number taken from user
<snip>

>>    loop
>>       begin -- block for exception handler
>>          Put(Item => "Please enter a four digit number.");
>>          New_Line;
>>          Get(Item => Number);
>>          exit;
>>
>>
>>       exception
>>          when Constraint_Error =>
>>             Put ("The input value or result is out of range.");
>>             Skip_Line;
>>             New_Line;
>>          when Data_Error =>
>>             Put (Item => "The input value is not well formed.");
>>             Skip_Line;
>>             New_Line;
>>       end;       -- block for exception handler
>>    end loop;
>
> Your input routine will not yield the error checking you seem to
> think it yields here. You define number as an instance of an
> anonymous subtype of Natural. You then use the package
> Ada.Integer_Text_IO for your input. That package knows nothing
> about your anonymous subtype except that it is a subtype of
> Inteter. It will not generat a Constraint_Error upon out of range
> input.

The range is checked when Get returns, as Item is copied into Number.

-- 
-- Stephe