Re: Conversions

[Adam Beneschan <adam@irvine.com>]

On Oct 26, 12:27 pm, Bruno <brunomend...@gmail.com> wrote:
> Hi all,
>
> I have a little problem with a function that "convert" a date, that is a
> record type, into a string. To do this I'm using "image" attribute how
> can you see in the following code
>
> http://paste.ideaslabs.com/show/5KEJUGcDF
>
> but when run the program and the function is executed a get an
> "constraint error". The compiler show me a message that say that the
> size is too long but I don't know what to do.

'Image returns a string whose first character is a space if the
argument is not negative.  So if N = 12, then Integer'Image(N) = "
12"---i.e. 3 characters.  That won't fit in the two-character slice
you're trying to put it in, so you get a Constraint_Error.

But just getting rid of the space doesn't work either.  If N = 1, then
Integer'Image(N) = " 1", and if you were able to trim off the space,
the result would be "1", and you'd still get a Constraint_Error.  When
you assign a slice like this, the left and right sides must be the
same length.

There are a number of ways to do what you want, but I'd suggest
looking at the Ada.Strings.Fixed package, especially the Move, Trim,
and Tail routines.

Hope this helps,

                                    -- Adam