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From: "DuckE" <nospam_steved94@home.com>
Newsgroups: comp.lang.ada
References: <9m0gn6$b6j$1@zeus.orl.lmco.com>
Subject: Re: Hi byte and Lo Byte Question
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Date: Thu, 23 Aug 2001 01:26:31 GMT
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Date: 2001-08-23T01:26:31+00:00
List-Id: <comp.lang.ada>

You don't really say anything about the data types you're working with, so
I'll just assume you're using Interfaces.Unsigned_16.  This sample Ada
program fairly closely matches the C example you gave, although you didn't
give any examples of types.

with Interfaces;
 use Interfaces;
with Ada.Text_Io;

procedure testbytes is

  package Unsigned_16_Io is new Ada.Text_Io.Modular_Io( Unsigned_16 );

  function LOBYTE( value : Unsigned_16 ) return Unsigned_16 is
  pragma Inline( LOBYTE );
  begin
    return value and 16#FF#;
  end LOBYTE;

  function HIBYTE( value : Unsigned_16 ) return Unsigned_16 is
  pragma Inline(HIBYTE);
  begin
    return Shift_Right( value, 8 );
  end HIBYTE;

begin
  declare
    a : Unsigned_16;
  begin
    a := 16#0102#;
    Ada.Text_Io.Put( "Value:  " );
    Unsigned_16_Io.Put( a, 8, 16 );
    Ada.Text_Io.New_Line;
    Ada.Text_Io.Put( "LOBYTE: " );
    Unsigned_16_Io.Put( LOBYTE( a ), 8, 16 );
    Ada.Text_Io.New_Line;
    Ada.Text_Io.Put( "HIBYTE: " );
    Unsigned_16_Io.Put( HIBYTE( a ), 8, 16 );
    Ada.Text_Io.New_Line;
  end;
end testbytes;

BTW: In Ada things are usually described in a more abstract manner, except
sometimes when dealing with interfaces.

SteveD


"mop" <mop65715@pegasus.cc.ucf.edu> wrote in message
news:9m0gn6$b6j$1@zeus.orl.lmco.com...
>
> I need to parse data into hi byte and lo byte. Does Ada have some built in
> macros or .... I could use?  From the looks of it no.
>
> here's the C version .... Need the Ada version as am new to Ada.
>
> lo = LOBYTE(Value);   -- need Ada version for this LOBYTE macro
> hi = HIBYTE(Value);    -- need Ada version for this HIBYTE macro
> WORD.Data.Word5_Data_Value_In_HB_LB_Order[0] = hi;
> WORD.Data.Word5_Data_Value_In_HB_LB_Order[1] = lo;
>
>
>