Problems with Last statment ....

Problems with Last statment ....

[Defiant]

hi im writing a program for a uni assignment and it is complete and works
yet i have set the string type to a min of 1 to a max of 20 characters for a
name input...

the problem i am having is i am using the Get_Line(Name, Last) statement to
get the name they feed in and the Put(Name); procedure to output... the
problem is ada compiler grabs whatever extra numerals hex and garbage that
is left in RAM to fill the extra places between 1 and 20... that the name
that was input doesnt fill ....


any suggestions ...

Thanks

Re: Problems with Last statment ....

[John J Cupak Jr]

[-- Attachment #1: Type: text/plain, Size: 852 bytes --]

I hear about this problem quite a bit from my Ada students.

Reading/Writing fixed-length strings:

Get_Line(Name, Last); -- Reads 0..Last number of characters into Name string
Put         (Name(1..Last)); -- Put ONLY characters just read to output!

Hope this helps!

Yours in Ada,
John

Defiant wrote:

> hi im writing a program for a uni assignment and it is complete and works
> yet i have set the string type to a min of 1 to a max of 20 characters for a
> name input...
>
> the problem i am having is i am using the Get_Line(Name, Last) statement to
> get the name they feed in and the Put(Name); procedure to output... the
> problem is ada compiler grabs whatever extra numerals hex and garbage that
> is left in RAM to fill the extra places between 1 and 20... that the name
> that was input doesnt fill ....
>
> any suggestions ...
>
> Thanks

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Re: Problems with Last statment ....

[Frank J. Lhota]

"Defiant" <ithinkiforgot@.bad.memory.com> wrote in message
news:38ce6681.0@news.per.paradox.net.au...
> hi im writing a program for a uni assignment and it is complete and works
> yet i have set the string type to a min of 1 to a max of 20 characters for
a
> name input...
>
> the problem i am having is i am using the Get_Line(Name, Last) statement
to
> get the name they feed in and the Put(Name); procedure to output... the
> problem is ada compiler grabs whatever extra numerals hex and garbage that
> is left in RAM to fill the extra places between 1 and 20... that the name
> that was input doesnt fill ....
>
>
> any suggestions ...
>
> Thanks
>
>
>

The call Get_Line(Name, Last) returns the most recently read line in Name( 1
.. Last ). For example, if the next line is "Hello", then the call
Get_Line(Name, Last) will set Last to 5 and set Name( 1 .. 5 ) to "Hello".
Any character in Name after Name( Last ) is garbage, and therefore should
not be output.

To write only the characters that were actually in the input line, try the
call

    Put ( Name( 1 .. Last ) );

If you want to output the name right padded to 20 characters, you could do
the following:

    Name ( Last + 1 .. Name'Last ) := ( others => ' ');    -- Blank out the
unread portion.
    Put ( Name );

Hope this helps.

Re: Problems with Last statment ....

[Defiant]

THANKS HEAPS !! works like a charm... ill have to remeber this think ill be
using the last statement a bit, thanks!


"John J Cupak Jr" <John_J_Cupak@res.raytheon.com> wrote in message
news:38CE7AD7.7A111DC0@res.raytheon.com...
> I hear about this problem quite a bit from my Ada students.
>
> Reading/Writing fixed-length strings:
>
> Get_Line(Name, Last); -- Reads 0..Last number of characters into Name
string
> Put         (Name(1..Last)); -- Put ONLY characters just read to output!
>
> Hope this helps!
>
> Yours in Ada,
> John
>
> Defiant wrote:
>
> > hi im writing a program for a uni assignment and it is complete and
works
> > yet i have set the string type to a min of 1 to a max of 20 characters
for a
> > name input...
> >
> > the problem i am having is i am using the Get_Line(Name, Last) statement
to
> > get the name they feed in and the Put(Name); procedure to output... the
> > problem is ada compiler grabs whatever extra numerals hex and garbage
that
> > is left in RAM to fill the extra places between 1 and 20... that the
name
> > that was input doesnt fill ....
> >
> > any suggestions ...
> >
> > Thanks
>

Re: Problems with Last statment ....

[John English]

Defiant wrote:
> hi im writing a program for a uni assignment and it is complete and works
> yet i have set the string type to a min of 1 to a max of 20 characters for
> a name input...
> 
> the problem i am having is i am using the Get_Line(Name, Last) statement to
> get the name they feed in and the Put(Name); procedure to output... the
> problem is ada compiler grabs whatever extra numerals hex and garbage that
> is left in RAM to fill the extra places between 1 and 20... that the name
> that was input doesnt fill ....

The reason for the Last parameter to Get_Line is it tells you
how many characters were actually read in. To print out just
the characters that you read in, try this:

  Put( Name(1..Last) );

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