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

Tree Menu
Hi guys,

Can anyone help me making a tree navigation system? I have a site where I'm allowin

PHP doesn't send my mail
Hi all, I found this and used it to send mail. Simple contact form with some required fields. The va

Warning: mysql_num_rows() expects parameter 1
When i add quote at the end of this link
example:http://localhost/articlemania/category.php?cid=3

How to know if online site made with PHP
Hello,
I see some sites that does not display extensions at all , for example:

www.site.co

how to populate a drop down box
Hi buddies!

PROCEDURE DOWNLOAD_REPORT_FORM (report_name varchar) is begin DOWNLO

Need help/w Page: 1,2,3,4 function!
So I have this code im working on where it's ment to display seperate pages having 20 logs each
I

Function module "DPS_CHECK_TABLE_EXISTS" not found (after OSS 1422843 impl)
Dear All,

I implemented Note OSS 1422843.

When i execute the new report RSPO20

Connection Timeout
I'm using xmii 12.0

I'm calling a transaction as a web service from a windows application

Passing Arguments to execlp()
I'm writing a program that mimics a unix shell. It's supposed to take commands with arguments and ex

get font info from a font file
hello,

Does anyone know how to get font info from a font file ... using php of course !
<