pascal to Ada

pascal to Ada

[Munir Albeelbisi]

is there any pascal to Ada converter

Re: pascal to Ada

[Pascal Obry]

"Munir Albeelbisi" <munir.albeelbisi@sympatico.ca> writes:

> is there any pascal to Ada converter

Sure:

http://members.nbci.com/gdemont/

It is called Newp2ada see the Soft section
(http://members.nbci.com/gdemont/gsoft.htm).

Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
--|------------------------------------------------------
--|         http://perso.wanadoo.fr/pascal.obry
--|
--| "The best way to travel is by means of imagination"

Re: pascal to Ada

[Marc A. Criley]

Pascal Obry wrote:
> 
> "Munir Albeelbisi" <munir.albeelbisi@sympatico.ca> writes:
> 
> > is there any pascal to Ada converter
> 
   <snip>
> 
> Pascal.
> 

But it looks to me like Pascal has already been converted to Ada!   :-)
:-)

Marc

Re: pascal to Ada

[Pascal Obry]

"Marc A. Criley" <mcquadex@earthlink.net> writes:
> But it looks to me like Pascal has already been converted to Ada!   :-)
> :-)
> 

Yes, and it is a 100% complete convertion, but it was not 100% automatic :) :)

Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
--| 45, rue Gabriel Peri - 78114 Magny Les Hameaux FRANCE
--|------------------------------------------------------
--|         http://perso.wanadoo.fr/pascal.obry
--|
--| "The best way to travel is by means of imagination"

Re: pascal to Ada

[David C. Hoos, Sr.]

Take a look at the web page
http://members.nbci.com/gdemont/pascada.htm

"Munir Albeelbisi" <munir.albeelbisi@sympatico.ca> wrote in message
news:p0Bi6.118862$Pm2.2242177@news20.bellglobal.com...
> is there any pascal to Ada converter
>
>

Re: pascal to Ada

[Randy Brukardt]

Munir Albeelbisi wrote in message ...
>is there any pascal to Ada converter

If you're looking for a supported product, R.R. Software still offers
it's Pastran product. It will convert about 99% of IEEE standard Pascal
to Ada that functions identically. We also offer customization of
Pastran for specific Pascal dialects (this is practical only for large
projects, because of the costs involved).

            Randy Brukardt
            R.R. Software, Inc.

Pascal to ADA

[Tilman Gloetzner]

Hello,

1) what is a effecient way of rewriting the following code fragement in ADA
?  With the absolute keyword, Pascal  effectively casts
N, M, and R from a 4 byte integer type to an array of 4 bytes by an address
access.  I guess to implement the same mechanism in
ADA is not in line with ADA's philosophy.

2) How do I mask out bits in a (unsigned) number type, as logical operators
work only on booleans ?

Thank you,

Tilman

----------------------------------------------------------------
PROCEDURE Add32(N:LONGINT;M:LONGINT;VAR R:LONGINT) ;
VAR
     _N : ARRAY[0..3] OF BYTE ABSOLUTE N ;
     _M : ARRAY[0..3] OF BYTE ABSOLUTE M ;
     _R : ARRAY[0..3] OF BYTE ABSOLUTE R ;
     A  : BYTE ;
     B  : WORD ;
     C  : WORD ; { Carry }
BEGIN
     R := 0 ;
     C := 0 ;
     FOR A := 0 TO 3 DO BEGIN
         B := _N[A] + _M[A] + C ;
         _R[A] := B AND $FF ;
         C := B SHR 8 ;
     END ;
END  ;

Re: Pascal to ADA

[Vinzent 'Gadget' Hoefler]

Tilman Gloetzner wrote:

>Hello,
>
>1) what is a effecient way of rewriting the following code fragement in ADA
[...]

It's called Ada. Just like Pascal.

>----------------------------------------------------------------
>PROCEDURE Add32(N:LONGINT;M:LONGINT;VAR R:LONGINT) ;

The most simple way I see would be:

|R := N + M;

or if you insist on using a procedure:

|type LongInt is range -2**31 .. 2**31 - 1;
|
|procedure Add32 (N : in  LongInt;
|	          M : in  LongInt;
|                 R : out LongInt) is
|begin
|   R := N + M;
|end Add32;


Vinzent.

Re: Pascal to ADA

[Marius Amado Alves]

On Mon, 2003-11-17 at 10:12, Tilman Gloetzner wrote:
> Hello,
> 
> 1) what is a effecient way of rewriting the following code fragement in ADA
> ?  With the absolute keyword, Pascal  effectively casts...

If you don't write "PASCAL", why on Earth do you write "ADA"???!!!

Ada has many ways to treat bits as boolean values: (uncheckedly) convert
between a modular type and an array of Boolean; a record type with
Boolean components and representation clauses...

Sorry, the Pascal reference I have here (Report 3rd ed., 1984) does not
have the "absolute" keyword, so I cannot interpret your code further
just now. Since when is "absolute" in the standard, BTW?

Re: Pascal to ADA

[Ole-Hjalmar Kristensen]

1. Why do you need this routine at all? 

2. You can accomplish the same in Ada in different ways. two obvious
   solutions are unchecked_conversion or an overlay with an address
   clause between a packed array of bytes and your 32 bit integer.

Overlay version:

type Long_Int is range -2**31 .. 2**31 - 1;
type Byte is mod 2**8;
...

Procedure Add(N: Long_Int; M: Long_Int; R : out Long_Int) is
  Cheat_N : array(0..3) of Byte;
  pragma pack(Cheat_N);
  for Cheat_N'address use N'address;
...
begin
...
end Add;

3. Logical operators also work on modular integers. Ada also has
   arithmetic shift, so you can conveniently access the carry bit.

>>>>> "TG" == Tilman Gloetzner <tilman.gloetzner@etas.co.kr> writes:

    TG> Hello,
    TG> 1) what is a effecient way of rewriting the following code fragement in ADA
    TG> ?  With the absolute keyword, Pascal  effectively casts
    TG> N, M, and R from a 4 byte integer type to an array of 4 bytes by an address
    TG> access.  I guess to implement the same mechanism in
    TG> ADA is not in line with ADA's philosophy.

    TG> 2) How do I mask out bits in a (unsigned) number type, as logical operators
    TG> work only on booleans ?

    TG> Thank you,

    TG> Tilman

    TG> ----------------------------------------------------------------
    TG> PROCEDURE Add32(N:LONGINT;M:LONGINT;VAR R:LONGINT) ;
    TG> VAR
    TG>      _N : ARRAY[0..3] OF BYTE ABSOLUTE N ;
    TG>      _M : ARRAY[0..3] OF BYTE ABSOLUTE M ;
    TG>      _R : ARRAY[0..3] OF BYTE ABSOLUTE R ;
    TG>      A  : BYTE ;
    TG>      B  : WORD ;
    TG>      C  : WORD ; { Carry }
    TG> BEGIN
    TG>      R := 0 ;
    TG>      C := 0 ;
    TG>      FOR A := 0 TO 3 DO BEGIN
    TG>          B := _N[A] + _M[A] + C ;
    TG>          _R[A] := B AND $FF ;
    TG>          C := B SHR 8 ;
    TG>      END ;
    TG> END  ;



-- 
Strange attractors stole my wife

Re: Pascal to ADA

[Marius Amado Alves]

On Mon, 2003-11-17 at 10:44, Marius Amado Alves wrote:
> Sorry, the Pascal reference I have here (Report 3rd ed., 1984) does not
> have the "absolute" keyword, so I cannot interpret your code further
> just now. Since when is "absolute" in the standard, BTW?

(Replying to myself.) It seems "absolute" is strictly a *Turbo* Pascal
extension.

Re: Pascal to ADA

[Steve]

This is as close as I can come to a literal translation:

  subtype BYTE is Unsigned_8;
  subtype LONGINT is Integer;
  subtype WORD is Unsigned_16;

  procedure Add32(N:LONGINT;M:LONGINT;R: in out LONGINT) is
    N_As_Bytes : array(0..3) of BYTE;
    for N_As_Bytes'Address use N'Address;
    M_As_Bytes : array(0..3) of BYTE;
    for M_As_Bytes'Address use M'Address;
    R_As_Bytes : array(0..3) of BYTE;
    for R_As_Bytes'Address use R'Address;
    B : WORD;
    C : WORD;-- Carry
  begin
    R := 0 ;
    C := 0 ;
    for A in 0 .. 3 loop
      B := WORD( N_As_Bytes(A) + M_As_Bytes(A) ) + C ;
      R_As_Bytes(A) := BYTE( B and 16#FF# );
      C := Shift_Right( B, 8 );
    end loop;
  end Add32;

You'll need to have "with Interfaces; use Interfaces" included in order to
define Unsigned_8 and Unsigned_16.

I changed _N to N_As_Bytes since Ada does not permit using an underscore as
the first character in an identifier.

Steve
(The Duck)


"Tilman Gloetzner" <tilman.gloetzner@etas.co.kr> wrote in message
news:bpa46j$o0l$1@news1.kornet.net...
> Hello,
>
> 1) what is a effecient way of rewriting the following code fragement in
ADA
> ?  With the absolute keyword, Pascal  effectively casts
> N, M, and R from a 4 byte integer type to an array of 4 bytes by an
address
> access.  I guess to implement the same mechanism in
> ADA is not in line with ADA's philosophy.
>
> 2) How do I mask out bits in a (unsigned) number type, as logical
operators
> work only on booleans ?
>
> Thank you,
>
> Tilman
>
> ----------------------------------------------------------------
> PROCEDURE Add32(N:LONGINT;M:LONGINT;VAR R:LONGINT) ;
> VAR
>      _N : ARRAY[0..3] OF BYTE ABSOLUTE N ;
>      _M : ARRAY[0..3] OF BYTE ABSOLUTE M ;
>      _R : ARRAY[0..3] OF BYTE ABSOLUTE R ;
>      A  : BYTE ;
>      B  : WORD ;
>      C  : WORD ; { Carry }
> BEGIN
>      R := 0 ;
>      C := 0 ;
>      FOR A := 0 TO 3 DO BEGIN
>          B := _N[A] + _M[A] + C ;
>          _R[A] := B AND $FF ;
>          C := B SHR 8 ;
>      END ;
> END  ;
>
>

Re: Pascal to ADA

[tmoran]

> subtype BYTE is Unsigned_8;
> subtype LONGINT is Integer;
> subtype WORD is Unsigned_16;
   The middle one should of course be
  subtype LONGINT is Integer_32;
both for consistency and because the Standard Integer is only required to
hold at least 16 bits but could hold as many as the compiler writer chose.

Re: Pascal to ADA

[Lutz Donnerhacke]

* Tilman Gloetzner wrote:
> 1) what is a effecient way of rewriting the following code fragement in ADA
> ?  With the absolute keyword, Pascal  effectively casts
> N, M, and R from a 4 byte integer type to an array of 4 bytes by an address
> access.  I guess to implement the same mechanism in
> ADA is not in line with ADA's philosophy.
> 
> 2) How do I mask out bits in a (unsigned) number type, as logical operators
> work only on booleans ?

type Do_It_Right is mod 2**(4*8);