I would do it like so (ie, not use grid )

#!/perl/bin/perl -w

use strict;
use Tk;
use Tk::Button;
use Tk::Entry;

my $row = 0;
my $column = 0;
my $calc = "0.00";
my $buffer;
my %button;

my $mw = new MainWindow(-title => 'Calc', -bg => 'blue');
$mw->geometry("300x300");
my $topframe = $mw->Frame(-height => '40', -width => '300', -bg => 'bl
+ack');

$topframe->pack(-side => 'top', -expand => '0', -fill => 'x', -anchor,
+ 'nw'); 

my @rows;

push @rows, $mw->Frame()->pack( -expand, 1, -fill, 'both', -side, 'top
+', -padx, 3, -pady,3) for (0..3);


my $display   =  $topframe->Entry(-justify      => 'right',
                                  -state        => 'disabled', 
                                  -textvariable => \$calc)
                           ->pack(-expand       => '1',
                  -pady        => '20',
                  -padx        => '30',
                                  -fill         => 'x',
                                  -side         => 'left');

$mw->bind("<KeyRelease>" , sub { &keypress } );


my $r =0;
my $w = 0;

for my $i (
qw/
   7 8 9
   4 5 6 
   1 2 3
   0 . C / )
{



$button{$i} = $rows[$r] ->Button(-text    => "$i", 
                                -width   => '3', 
                                -height  => '1', 
                                -command => sub { &btnpress($i) })
                         ->pack( -expand, 1, -fill, 'both', -side, 'le
+ft', -padx, 2);
$w++;
if( $w == 3){ $r++; $w= 0; }

}





MainLoop;



sub btnpress{
    my $num = shift;
    if($num ne "C"){
    $buffer .= $num;
    $calc = sprintf "%0.2f", $buffer;
    }

   if($num eq "C"){  $calc = "0.00"; $buffer = 0.00; }
}

sub keypress{

    my $widget = shift;
    my $e = $widget->XEvent;    # get event object
    my $key = $e->K;
       $key=~s/period/\./ig;

    if( $key =~/c/ig ){ $key = uc $key;  $button{$key}->invoke; }
    
    if( $key =~/(\d)|\./){ &numpress($key); }

}
[download]

JamesNC

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

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:
	&		&
	<		&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.