<?php
require_once('primesfactory.php');
$n = $_GET['number'];
if ( strlen($n) == 0 )
{
echo "No number was input.<br/>";
echo "Come <a href=\"javascript:history.back(1);\">back</a> to the form and retry." ;
return ;
}
$pf = new primesfactory ;
$pf->insert_number( $n );
$pf->go();
if ( !$pf->isok() ) $pf->display_error();
else
{
echo "<b>The sieve of Eratosthenes</b><br/><br/><font color=#EEEE00><b>Primes</b></font> before <b>$n</b> are:<br/><br/>" ;
$columns = 14 ;
echo "<table style=\"padding:2px;border:1px solid #dedede;\">\n" ;
echo "\t<tr>\n" ;
for ( $i = 1 ; $i <= $n ; $i++ )
{
if ( $pf->isprime( $i ) ) echo "\t\t<td align=\"center\" style=\"border:1px solid black;\"><font color=#EEEE00 size=\"5\"><b>$i</b></font></td>\n";
else echo "\t\t<td align=\"center\"><font color=#0000EE size=\"5\">$i </font></td>\n" ;
echo "<td width=\"5\"><td>";
if ( $i % $columns == 0 ) echo "</tr>\n\t<tr>\n" ;
}
echo "</table>\n" ;
}
?>
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