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Subject: Re: creating own Image function
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From: Mark Lorenzen <mark.lorenzen@ofir.dk>
Date: 29 Dec 2004 18:04:08 +0100
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Date: 2004-12-29T18:04:08+01:00
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"R" <ruthless@poczta.onet.pl> writes:

> Hello.
> 
> I've written my own Image function it's sth like Java's toString.
> 
> function Image(this: rec1) return String is
> tmp : String(1..26);
> begin
> tmp := "The value of field is:" & Integer'Image(Get(this));
> return tmp;
> end Image;

Your questions are really newbee questions and I recommend that you
read a book about Ada in order to get it right from the beginning and
not take your knowledge of other languages into "Ada world".

> 
> when I use it:
> 
> testclass.Create(object, 100); -- note 100 is 3 digits = 3 Characters
> Put(testclass.Image(object));
> 
> then I can see "The value of field is: 100"
> when I initiate my object with 10 - 2 digits = 2 Characters
> an exception is raised:
> CONSTRAINT_ERROR : testclass.adb:34 length check failed
> 
> it's because tmp: Sting has it's fixed length can it be more flexible?
> 
> When I tried with String(1..100) the same effect
> users can initate their objects with 1, 11, 111, 111111 and so on.
> 
> so my question is: can I write(with Your help of course) a function
> flexible
> to handle all those situations?

Try:

function Image(this: rec1) return String is
begin
  return "The value of field is:" & Integer'Image(Get(this));
end Image;

> 
> thanks in advnce
> best regards R

- Mark Lorenzen