Re: Please give me some hints...

Re: Please give me some hints...

[chris.danx]

Look at line 9 'num_of_integer', then look at line 12.
Then look at the warnings given by the compiler.

If you do this you'll be able fix it.

One hint: when an exception is raised the line number is given.  Use this to
track it down.  In this case it was line 12.


Chris Campbell


"WWM" <wwminirl@hotmail.com> wrote in message
news:9909pn$19j2@tech.port.ac.uk...
> I have written a program: input 2 integers, output sorted integers
> one-by-one by descending order. e.g.
>
>
> Input an integer: 2
> Input another one: 7
>
> The sorted integer is:  7  6  5  4  3  2
>
>
>
> The problem is, when I run it, it says: STORAGE_ERROR
>
> Can any one help???
>
>
>
>
>

Re: Please give me some hints...

[chris.danx]

One thing i forgot.  You can't use a variable for the the array bounds in
many circumstances -- though there are some but your a beginner, right?.
Maybe you should use a constant for this.  I tried this by making
num_of_integer a constant but it wouldn't compile, so i fixed the array
bounds and tried to compile it.  It didn't work!

What i would suggest is you look at your spec.  If i understand your program
correctly you ask for the min/max numbers which are used to calculate
num_of_integers.  This then seems to be used as if it were the bounds of the
array.  You know there will be five number so this seems unneccessary.  If
your intention was to do something else, you may need to revise your
design -- be it on paper or in your head.


Hope this is helpful,
Chris Campbell

"chris.danx" <chris.danx@ntlworld.com> wrote in message
news:STRs6.10259$bL.819321@news6-win.server.ntlworld.com...
> Look at line 9 'num_of_integer', then look at line 12.
> Then look at the warnings given by the compiler.
>
> If you do this you'll be able fix it.
>
> One hint: when an exception is raised the line number is given.  Use this
to
> track it down.  In this case it was line 12.
>
>
> Chris Campbell
>
>
> "WWM" <wwminirl@hotmail.com> wrote in message
> news:9909pn$19j2@tech.port.ac.uk...
> > I have written a program: input 2 integers, output sorted integers
> > one-by-one by descending order. e.g.
> >
> >
> > Input an integer: 2
> > Input another one: 7
> >
> > The sorted integer is:  7  6  5  4  3  2
> >
> >
> >
> > The problem is, when I run it, it says: STORAGE_ERROR
> >
> > Can any one help???
> >
> >
> >
> >
> >
>
>

Re: Please give me some hints...

[Stephen Leake]

"WWM" <wwminirl@hotmail.com> writes:

> I have written a program: input 2 integers, output sorted integers
> one-by-one by descending order. e.g.
> 
> 
> Input an integer: 2
> Input another one: 7
> 
> The sorted integer is:  7  6  5  4  3  2
> 
> 
> 
> The problem is, when I run it, it says: STORAGE_ERROR
> 
   num_of_integer : positive;
  
   type NUMBER_TYPE is array(POSITIVE range<>) of INTEGER;
   NUMBERS: NUMBER_TYPE(1..num_of_integer);   --the array of numbers

This code is your problem. Space for the variable NUMBERS is allocated
at "elaboration time", which is before your code runs. So NUMBERS uses
the value of 'num_of_integer', which is some random number, probably
very large.

> Can any one help???

You need to use a nested declare block:

program unconstrained_sort is

   num_of_integer : positive;
  
   type NUMBER_TYPE is array(POSITIVE range<>) of INTEGER;

...
begin

   Put("input an int");
   get(max_int);
   put("input another");
   get(min_int);
   
   num_of_integer := max_int - min_int;

   declare
        NUMBERS: NUMBER_TYPE(1..num_of_integer);

   begin
       -- call sort etc.
   end;
end unconstrained_sort;

Now 'num_of_integer' has a good value when it is used.

-- 
-- Stephe