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

I need help with formatting date from mysql! with php!
Hello guys

*Note: this is a php question not MySQL question, please do not move it to mysql s

Sub-domains & calling unique content
Hello,

Is there a way use something similar to the $_GET function for a sub-domain? I to be a

this code is strange !
Hi i got this code from the web.. It checks for live and dead socks
It is working perfectly on my

Solution Manager BPR
Does the SolMan-BPR-ARIS-Integration (http://www.ids-scheer.com/en/ARIS/ARIS_Platform/ARIS_Business_

Echoing If Function?
A script I am using has If statements in the comments form to basically tell the form what to do. Cu

Program with calculate Meteorologic measurements
Hello I'm a beginner and I want to make a program with calculate Meteorologic measurements:
ba

How can i steam a video on my PHP site? (non YouTube)
Basically I have a PHP site and don't want to give page rank to YouTube. I just want to stream a bas

2 things: enter doesn't work in IE & empty form
i have this search form that works well except for 2 things.

1) on IE when i hit enter instea

passing an array of objects after submit
How do I do this? This is what I have tried and it is not working.

<form method="

what does this mean? +=
is anyone able to explain what this code is saying?

i had it written for me awhile back and n