Retrieve database table names and print them out

[admin]

This should be fairly simple. I've crafted an SQL query that dumps all matching database table names to an array. I want to print them out, yet for some reason I cannot. Please help!

Database tables are named: example_1, example_2, etc.

My code:

$sql = "SHOW TABLES LIKE 'example_%'";
$results = $wpdb->get_results($sql);

Doing a print_r($results) shows that all the table names were successfully retrieved.
Example output:

Array ( [0] => stdClass Object ( [Tables_in_wordpress (example_%)] => example_1 ) [1] => stdClass Object ( [Tables_in_wordpress (example_%)] => example_2 ) )

So then I tried:

foreach($results as $res) {
  echo $res;
}

But no luck. How can I iterate through

$results

to print out each table name? Is there something like

$results[0].value

I could use to retrieve the values?