Add post count class to WordPress loop

numbered_post_class_loop.php

<?php
  // Count the posts and give them each a unqiue number as a css class
  $count = 1; 
  while ( $query->have_posts() ) : $query->the_post(); $count <= 100; ?>
      <div class="count-<?php echo $count++; ?>">
          <p class="headline"><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></p>
      </div>
    <?php endwhile; ?>