🚀 go-pugleaf

> I need to knoiw how to decode a pointer to a set eg
> set_ptr = pointer to my_set
> my_set = (hello,there,how,are,you)

Tidy this up before coming back asking for more help :-)

> How do I decode the set_ptr;-((

The only permissible operations on a pointer are dereference, assignment, 
and comparison for equality/inequality. What are you trying to do?

> How do do and assignment to it;-((

To the pointer or to the entity it is pointing to?

> How do you exit a program in M2. Imean just exit the program totally
> from anywhere within it???

HALT, but be warned that some implementations treat this as an abnormal 
termination and produce a memory dump or whatever, also don't assume that 
files will be closed properly. The "right" way to do it depends very much 
on what you are trying to do, you are likely to lose marks if you are not 
_very_ careful since some academics consider RETURN and EXIT to be 
equivalent to GOTO and I am sure that they would also have included HALT 
if they could have brought themselves to use the word in public.

Mark Morgan Lloyd
mark_tbu@cix.compulink.co.uk

[Opinions above are the author's, not those of his employers or 
colleagues]

Satpal Chander (c9502007@zeus.hud.ac.uk) wrote:

>I need to knoiw how to decode a pointer to a set eg
>set_ptr = pointer to my_set
>my_set = (hello,there,how,are,you)

    TYPE
        MyType = (hello, there, how, are, you);
        SetPtr = POINTER TO MySet;
        MySet = SET OF MyType;

    VAR
        x: MyType;  y: MySet;  p: SetPtr;

    BEGIN
        x := hello;
        y := MySet {there, are};
        NEW (p);
        p^ := MySet {hello, you};
        y := p^;
        p^ := p^ + x;

        (* and so on *)

From some ambiguities in your question, it's not clear whether
you need a point to a set or a pointer to an enumerated type.
Before using any of this, you need to have a clear picture of
which types you really do need.

>How do you exit a program in M2. Imean just exit the program totally
>from anywhere within it???

From vague memory, I think it's the HALT statement.  The reason
my memory of this vague is that, in years of Modula-2 programming,
I've never found any use for this statement.  Giving up a job
in the middle is sloppy programming practice.  You'll get a more
professional-looking result if the program closes down gracefully;
and that includes a provision for anyone reading the code to
be able to see that it's closing down gracefully.  In my opinion,
that means that any procedure that needs to fail should do so
by returning an error code to the caller, rather than simply
collapsing.

--
Peter Moylan                           peter@ee.newcastle.edu.au
                  http://www.eng.newcastle.edu.au/ee/Moylan.html
OS/2 freeware list at 
      http://www.eng.newcastle.edu.au/ee/Moylan/os2/os2info.html

Satpal Chander <c9502007@zeus.hud.ac.uk> wrote:

>How do you exit a program in M2. Imean just exit the program totally
>from anywhere within it???

Using such things as a HALT command. I think this is what you need.
Later,
~Simon~