if while have no post code example

Example 1: php if have post

<?php 
if ( have_posts() ) {
	while ( have_posts() ) {
		the_post(); 
		//
		// Post Content here
		//
	} // end while
} // end if
?>

Example 2: have_posts()

NOTE: The functions, have_posts(); and the_post(); are tied to the default automatic query that wordpress makes
on its on using the current URL.