wordpress - How to add a class within php -

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i have code working pull in posts 1 category onto page in wordpress:

<?php query_posts('cat=28'); while (have_posts()) : the_post(); the_title(); the_content(); endwhile; ?>

what want able add css class both title , content. know little php maybe explain trying do.

<?php     query_posts('cat=28');     while (have_posts()) : the_post();     <div class="title-class">the_title();</div>     <div class="content-class">the_content();</div>     endwhile;     ?>

i know way off hope can lowly front end designer :)

use :

<?php     query_posts('cat=28');     while (have_posts()) : the_post(); ?>     <div class="title-class"><?php the_title(); ?></div>     <div class="content-class"><?php the_content(); ?></div> <?php     endwhile; ?>

or

<?php     query_posts('cat=28');     while (have_posts()) : the_post();     echo '<div class="title-class">'.the_title().'</div>';     echo '<div class="content-class">'.the_content().'</div>';     endwhile; ?>

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