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

Display search result
Hi!

I have a SQL database with information about albums and track (music).

This is wh

Need a Timecode Class...
Not a Time Stamp, Time Code. Format is a bit different. HH:MM:SS:FF where FF is Frames. I dont re

Select Rows as Columns..
is there a way to select COLUMN_NAME from user_tab_columns where table_name='TABLENAME';
and ha

Limiting uploaded file type
Hi. First post here
I am working on a simple upload script, and I need it to limit the allowed f

Require select-option functionality in Module Pool Programming
Hi Gurus,

I am doing a development by Module Pool on Warehouse Management. For that devel

How could I do this?
Ive got a simple lottery game, and am using an sql database to keep track of the numbers bought. But

php title problem
Hi,

I am having a problem managing my page title with PHP.

Currently I have my <

ereg_replace issue
hi there people

i have this code happening with regards to my wamp server. is this something

POST into Array problem
Hi Chaps,

I have a repeat region, displaying rows of data: jobid, fromtable, translatorcharge

How can I uploading Transactional Data from Legacy to New SAP system
Hell Gurus,

I am overwhelmed with questions on how to migrate huge volume of Sales Orders