Division problem involving form value

[Anon]

I want to use the value selected from form to do division but fail.Here's my code:

<form action="<? echo $PHP_SELF?>" method=post>
<select name="limit">
<option value="2">2 per page
<option value="4">4 per page
<option value="6">6 per page
<option value="8">8 per page
</select>
<input type="Submit" name="submit" value="set">
</form>

<hr>

<?php
$answer=10/(integer)$limit; <-------
echo $answer;
?>

It returns error code

Warning: Division by zero in /home/Tom/public_html/phpcodes/testform.php3 on line 14

How can I solve the problem? Thx

[brandonschnell]

don't divide by zero.

if ($limit != 0)
$answer=10/(integer)$limit;

[knickerlas]

Theres noting wrong with your code, when you first display the page $limit isn't set so it cant be divided by. If you 'choose' an option it works fine.
Try this and then experiment to get what you want

<?php
if (!$limit=='') {
$answer=10/(int)$limit;
echo $answer;
}
?>
'

Nick