Online PHP editor | output for TcM7T

<?php <? if($_POST['calc']) { //call function $avg = trial($_POST['num1'], $_POST['num2']); //display output echo("The average is:" . $avg . "<br>"); } else { // display form to get input ?> <html> <head> <title></title> </head> <body> <form name="form1" method="post" action=""> Enter first number <input type="text" name="num1" id="num1"> <br> Enter second number <input type="text" name="num2" id="num2"> <br> <input type="submit" name="calc" id="calc" value="Submit"> </form> <br><br> </body> </html> <? } // end if else ?> <? //******program-defined functions***** function trial($fnum1, $fnum2) { //calculates and returns an average $calcavg = 0; $calcavg = ($fnum1 + $fnum2) / 2; return $calcavg; } ?>