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

Estimations and Effort
HI Gurus,

Would like to know whether SAP have a provision for carrying out the Project es

redirect standard error and assert (how to?)
How do you redirect standard error and assert?

---

(Why? I am creating an web app and

CURL question
i am wondering if it's possible to use multi curl with login something like

login once to web

PHP code needed to get/post form fields and request mysql query results.
I'm new to PHP

I've created an html form to allow the user to request a basic telephone dire

How to search for several parameters from objects in a database?
I have a database with lots of information about objects.
Now I would like to search for 4 or 5 p

Login Issue's
Code: <?php
$file = fopen('user.txt', 'r');

/* Set login to false initially */

OPINIONS WANTED
This is my login page code, and I want your opinion on it please!

Code: // Login ~ CHECKS

PHP MySQL Return Results Issue
Hi guys,

I'm running joomla and made a module which is using ajax.
Basically i just have a

IP question
ive got 2 ip addresses both global from same user how would i detect if they are local to each other

need to add "sizes" to shopping cart
Hey guys, I am trying to figure out a way to add a "size" selector on to this bit of code.