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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Converting Type Characters to type string
Date: Mon, 31 Mar 2008 07:11:07 -0700 (PDT)
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Date: 2008-03-31T07:11:07-07:00
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jedivaughn wrote:
> The only problem I'm having is that I don't want to have to add a
> space or another character to the end of my string of numbers. As long
> as I set str : strin (1..999) := (others -> ' '); I can get all the
> characters I want but they have to be followed by something other then
> for a digit. Is there a way to get an input of a length unknown
> without having to take an extra character? 0ne user suggested the
> look_ahead  procedure if that would help solve this how would I use
> that?

Generally there are two ways of doing text input: fixed-width and
variable-width. In fixed-width form, the user must type exactly the
number of digits *you* want (no more, no less) but there is no need
for an extra character. This is really only useful when reading from a
file instead of the keyboard. In variable-width form, the user types
as many characters as *they* want, but they also have to insert a
terminating character. Usually, that character is Line Feed (produced
with the ENTER key). If that's what you want, you may want to call
Ada.Text_IO.Get_Line then traverse the resulting string looking for
digits.

See also http://www.it.bton.ac.uk/staff/je/adacraft/ch02.htm#2.6

--
Ludovic Brenta.