From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,e61c8636ef35379d
X-Google-Attributes: gid103376,public
From: John English <je@bton.ac.uk>
Subject: Re: Escape Sequences in Strings
Date: 2000/11/16
Message-ID: <3A13C41E.FCBDD34C@bton.ac.uk>#1/1
X-Deja-AN: 694294183
Content-Transfer-Encoding: 7bit
References: <3A17B0E2@MailAndNews.com> <3A1275A2.F2A843E9@bton.ac.uk>
 <8uub09$9sr$1@nnrp1.deja.com> <8uump3$s3o$1@news.huji.ac.il>
X-Accept-Language: en
Content-Type: text/plain; charset=us-ascii
X-Complaints-To: news@bton.ac.uk
X-Trace: saturn.bton.ac.uk 974373946 2720 193.62.183.204 (16 Nov 2000 11:25:46
 GMT)
Organization: University of Brighton
Mime-Version: 1.0
NNTP-Posting-Date: 16 Nov 2000 11:25:46 GMT
Newsgroups: comp.lang.ada
Date: 2000-11-16T11:25:46+00:00
List-Id: <comp.lang.ada>

Ehud Lamm wrote:
> Robert Dewar <robert_dewar@my-deja.com> wrote in message
> news:8uub09$9sr$1@nnrp1.deja.com...
> > In article <3A1275A2.F2A843E9@bton.ac.uk>,
> >   John English <je@bton.ac.uk> wrote:
> >
> > > Escape sequences are easy enough:
> > >   Ada.Text_IO.Put(ASCII.ESC & "[2J");    -- clear the screen
> >
> >
> > But we would never want to do that in a program, and indeed
> > Ada here helps us avoid the nasty habit of embedding odd
> > escape sequences in strings in C without any comments, often
> > with a result of making the program non-portable. The proper
> > coding in Ada would be:
> >
> >   Clear_Screen : constant String := ASCII.ESC & "[2J";
> >   --  ANSI escape sequence for clearing screen. Modify to
> >   --  meet requirements of your system.
> >
> >   Put (Clear_Screen);
> >
> > It is almost always wrong to have mysterious constants in code!
> >
> 
> And while you are at it, put the constant in a seperate packge of env.
> specific control codes.
> 
> --
> Ehud Lamm   mslamm@mscc.huji.ac.il
> http://purl.oclc.org/NET/ehudlamm <==  Me!

Hey guys, I agree completely, but I wanted to give a *short* answer,
not a complete package hierarchy with all the trimmings... and I
said it wasn't the way to go anyway... Give us a break!

-----------------------------------------------------------------
 John English              | mailto:je@brighton.ac.uk
 Senior Lecturer           | http://www.it.bton.ac.uk/staff/je
 Dept. of Computing        | ** NON-PROFIT CD FOR CS STUDENTS **
 University of Brighton    |    -- see http://burks.bton.ac.uk
-----------------------------------------------------------------