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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: Base 12 Integer IO
Date: Mon, 3 Feb 2003 18:56:14 +0000 (UTC)
Organization: GMUGHDU
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Paolo Argenton <paoloa1@yahoo.com> wrote:
: 
: I would like to do base 12 Integer IO;
 
The following certainly has some flaws, but it might, I hope,
provide something with which you can start.
The package `dozens' allows a conversion to plain base 12
number strings, 0-padding is added in a test routine that follows:


with Ada.Text_IO;  use Ada.TExt_IO;
with Ada.strings.fixed;    use Ada.strings.fixed;
with dozens;  use dozens;


procedure dtest is
   max_digits: constant := 4;
   -- duodecimal digits needed, adjust accordingly, affects padding

   function add_padding(nrep: String) return String;
   --  adds padding to number string `nrep`

   function add_padding(nrep: String) return String is
      offset: constant Integer := Boolean'pos(nrep(nrep'first) = '-');
      --  nrep represents a negative number iff 1
   begin
      return (offset * '-') &
	 tail(nrep(nrep'first + offset.. nrep'last), max_digits, pad => '0');
   end add_padding;

begin
   for d in Base_12_int(-12)..12 loop
      put_line(add_padding(dozens.to_string(d)) &
	 " for decimal " & Base_12_int'image(d));
   end loop;
end dtest;


package dozens is

   type Base_12_int is range -(12**10).. 12**10 - 1;

   function to_string(n: Base_12_int) return String;

end dozens;



with Ada.text_IO;
with Ada.strings.fixed;
use Ada;

package body dozens is


   package B12_IO is new Text_IO.Integer_IO(num => Base_12_int);
   --  see body statements below for default settings

   ---------------
   -- to_string --
   ---------------
   -- we know the prefix "-12#" has a length of 4 characters,
   -- and there is "#" in the end

   function to_string (n: Base_12_int) return String is
      use B12_IO, strings.fixed;
      result:  string (1..default_width + 5);  -- enough given a base >= 10
   begin
      put(result, n);

      declare
         bare: constant String := trim(result, strings.left);
      begin
         if n < 0 then
            return '-' & bare(5.. bare'last-1);
         else
            return bare(4.. bare'last-1);
         end if;
      end;
   end to_string;

begin
   B12_IO.default_base := 12;
end dozens;