example2.php - Primes Factory

File:

example2.php

Role:

Example script

Content type:

text/plain

Description:

example of Erathostenes' sieve

Class:

Primes Factory
Perform calculations with prime numbers

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<?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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