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Web based Calculator with WWW::Mechanize

#!/usr/bin/perl
use strict;
use warnings;

use WWW::Mechanize;

my $url = 'http://localhost:8080';

my $mech = WWW::Mechanize->new;
$mech->get($url);

$mech->follow_link( text => 'calculator' );

$mech->submit_form(
    fields => {
       a => 23,
       b => 19,
    },
);
print $mech->content;

Output:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01
  Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<html>
<head><title>Result</title></head>
<body>
<h1 align="center">42</h1>
</body>
</html>