Hi,
I want to display the program status in a perl tk label widget, but am unable to. The widget is displaying the status only at the end of the script.I am submitting a short piece of code for your perusal. 
use warnings;
use strict;
use Tk;

my ($no,$upper_no,$mw);

$mw = MainWindow->new;
$mw->geometry("300x100");
$mw->title("PerlTk Test");
$mw->Label(-text => "Enter a 5 digit  number")
            ->place(-relx => 0.0,-rely => 0.05);
$mw->Entry(-takefocus => 1,
    -textvariable => \$upper_no,
    -width => 12)
    ->place(-relx => 0.50, -rely => 0.05);
$mw->Button(-text => "Click to count upto that number and display them
+ below as you count", 
    -wraplength => 250,
    -command => \&count)
    ->place(-relx => 0.5, -anchor => "center", -rely =>0.50);
$mw->Label(-textvariable => \$no,
     -relief => 'sunken', 
    -anchor => 'center')
    ->place(-relx =>0.0, -rely => 0.80, -relwidth => 1.0, -relheight =
+> 0.2);

MainLoop;

sub count {
if ($upper_no > 0) {
$no = 0;
while ($no < $upper_no) {
$no++;
    } 
    }
    }

[download]
Where am I going wrong?
Jagdish

In reply to displaying program status in perl tk by jagdish.eashwar

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.