Lesson 11 Forms (Error Message )

When Running: Exercise 11a get

Error Message : Undefined index FtoC on line 8

as well as index CtoF on line 13


Code is:

<?php
require_once("exercise11b.php");
$answer = '';






if ($_POST['FtoC'] ) // Line 8
{
$answer = convertFtoC((float) $_POST['temperature']);
}

elseif ($_POST['CtoF']) // Line 13
{
$answer = convertCtoF((float) $_POST['temperature']);
}



?>

------------------------------------------------------

It Calculates Ok but PHP does Not Understand the

['FtoC'] & ['CtoF'] Index's

It Appears something is Missing (Not Initialized)

(Could Not Find any Info in Book about Debugging this Problem.... )

Hi :

replace your code with :

<?php
$answer='';
if (isset($_POST['FtoC'])){
$answer=convertFtoC((float) $_POST['temperature']);
} elseif (isset($_POST['CtoF'])) {
$answer=convertCtoF((float) $_POST['temperature']);
}
?>

cheers