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';
Did you know?Explore Trending and Topic pages for more stories like this.
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?
No comments posted yet

Your Answer:

Login to answer
68 Like 24 Dislike
Previous forums Next forums
Other forums

Optimize Code
Just started getting into the use of cookies. The following code will redirect users to a set URL s

Help with some dates
I have a list of dates in an array:

$mondays = array(
strtotime("October 12, 2009

How to change www in url with a specified name
Hi
I'm trying to change the url http://www.sitename.com/apparels to something like below
http:

Help Ordering Arrays
Hi, I have 3 arrays as shown below.

Code: $users = $this->get_latest_users();
$flir

Anti Spam Code Problems
Ok where do i start? Probably by telling you I have very little working knowledge of PHP and that I

What makes a script your own?
If someone finds a login script online, and changes some variable names around and some other minor

Problem with array max size.
Hi to everyone,
I've got a homework about filling a bidimensional array un spiral shape, I alre

Looking for help on using joining mysql tables and php....
Does anyone have any good links to references on how to pull mysql data, through joining tables and

Convert .fdf to .pdf
I currently have a web form that uploads the form data to an .fdf file and emails it.

However

Something Non-Traditional. Can we solve?
I have an idea for an application here. It's mostly flash, but it couldn't work without a somewhat n

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash