How to Dynamic post title

Adding this code to your wordpress theme will dynamically create a title. 
<title><?php
          if (is_home()) { echo bloginfo('name');
              } else if (is_404()) {
                           echo '404 Not Found';
              } else if (is_category()) {
                           echo 'Category:'; wp_title('');
              } else if (is_search()) {
                           echo 'Search Results';
              } else if ( is_day() || is_month() || is_year() ) {
                           echo 'Archives:'; wp_title('');
              } else {
                           echo wp_title('');
              }
?></title>