Here is the latest version of my calculator script. It treats each line of input, stopping on an '=' character, as a separate calculation, and appends the answer after an '=' character. That way you can easily amend the calculation and perform it again.

@rem = '--*-Perl-*--
@echo off
perl "%~dpnx0" %*
goto endofperl
@rem ';
#!perl
#line 8
use strict;
use warnings;
use Win32::Clipboard;

sub X { return sprintf("%x",$_[0]); }
sub x { return X($_[0]); }

my $CLIP = Win32::Clipboard();
my $text = $CLIP->GetText();
my @text = split /\n/, $text;
my @results = ();
for ( @text ) {
  s[\x0a][];
  s[\x0d][];
  s/([^=]+)=.+/$1/;      # trim after '='
  s/(^|[^0-9\.])0+/$1/g; # remove leading zeros (don't want octal)
  print "\$_.=' =\t'.($_)\n";
  eval("\$_.=' =\t'.($_)");
  print "   = $_\n";
  push @results, $_;
}
$CLIP->Set(join("\n",@results)."\n");

__END__

4*3
11-4*2
010+020+030 =    61
x(123) =    7b

:endofperl
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