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From: Robert Dewar <robert_dewar@my-deja.com>
Subject: Re: Escape Sequences in Strings
Date: 2000/11/15
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Date: 2000-11-15T00:00:00+00:00
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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!


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