calculator

Posted on 16th Feb 2014 07:03 pm by admin

I can't figure out why this code doesn't work. No error messages. Page loads.

Code: <?php # Script 3.9 - calculator.php
$page_title = 'Widget Cost Calculator';
include ('./header.html');



function calculate_total ($tax= 5) {
global $total;
$taxrate = $tax / 100;
$total = ($_POST['quantity'] * $_POST['price']) * ($taxrate + 1);
$total = number_format ($total, 2);
}


if (isset($_POST['submitted'])) {

if (is_numeric($_POST['quantity']) && is_numeric($_POST['price'])) {


echo '<h1 id="mainhead">Total Cost</h1>';

$total = NULL;

if (is_numeric($_POST['tax'])) {
calculate_total ($_POST['tax']);
} else {
calculate_total ();
}

echo '<p>The total cost of purchasing '. $_POST['quantity'] .' widget(s) at $'.
number_format ($_POST['price'], 2). ' each is $'. $total .'.</p>';

echo '<p><br/></p>';

} else {

echo '<h1 id="mainhead">Error!</h1>
<p class="error">Please enter a valid quantity and price.</p><p><br/></p>';
}

}

?>
<h2>Widget Cost Calculator</h2>
<form action="calculator.php" method="post">
<p>Quantity: <input type="text" name="quantity" size="5" maxlength="10" value="<?php if (isset($_POST['quantity'])) echo $_POST['quantity'];?>"/></p>
<p>Price: <input type="text" name="price" size="5" maxlength="10" value="<?php if (isset($_POST['price'])) echo $_POST['price'];?>"/></p>
<p>Tax (%): <input type="text" name="tax" size="5" maxlength="10" value="<?php if (isset($_POST['tax'])) echo $_POST['tax'];?>"/>(optional)</p>
<p><input type="submit" name"submit" value="Calculate!"/></p>
<input type="hidden" name"submitted" value="TRUE"/>
</form>


<?php
include ('./footer.html');
?>The calculator does not work and won't display anything. I've checked the code three times in the text book and I believe their is no typo's. What am I doing wrong?

Your Answer:

Login to answer

Other forums

How do I use a global footer..?
If my index.php has a bole bunch of if functions and exit's in them

update the selected existing records of database
Hi frndz,
I am new to php and get stuck....

Edit.php > Update.php > Updatea

List/Menu Box
On an edit page when you want something to select what a user has previously selected from the datab

'grab_files', multiple extension?
hey guys,

can anyone suggest a way to make to following line of code look for files with more

Character Set Setup
Whats the best character set to use if you want every character to work, and also how do you make yo

Update Myspace status with CURL
Logging in:

Code: <?php

class Myspace
{
function login($username, $pa

PHP Form to Variable.
Hi! I have written a HTML-form code in DreamWeaver CS3 (in a PHP doc) and I really need it to work s

FlashVar function how to insert variables
Hi guys. Im new in this forum and also new in php programming. Can you help me about this code?
<

Target costs on Process orders not calculating
Hi All,

We have released standard costs for all the materials. We have also done Goods r

Apple's revamped lineup arrives

I'm personally curious about the magic mouse.. a multi-touch concept sounds like it could be nea