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

Database connection failure
Hello All,

I am trying to create new connection to Oracle DB 10.1,
I could not see a

Mail sending is slow on server
Why mail is taking time to be send on apache-linux server

UDS 4.0 Datatype issue
UDS 4.0.322 -- connecting to NI Labview 9.0

When using connection method: Cache with live

an interesting question
Greetings folks, got to ask an interesting question...

let say
i have created a function s

Array question
Does anyone know how to create a program that takes the $ amount for 8 different departments and gi

Problem!
I have another problem, when i run this code i get this error "Parse error: syntax error, unexp

1,000 select boxes with 100 options?!
I have 1 drop down select box with 1,000 options.


In some case, there will be 100+ of the

Bluetooth RSSI & VIsta
Okie I got 4 Bluetooth adapters, a DBT-120 by Dlink, A Zonet Microsoft Bluetooth which is what I use

Dynamic memory problem
Hey,

At the beginning of my code, I have this line:

Shape* gShape = 0;

login to other site by sending post variables
hey,

here is my problem: my school gave me a mail account for school-stuff use. they mail us