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

Php navigation
I have four buttons on a php page.
If i click a button it will redirect to different php pages.

Multiple Options for a Single Page
For this example I want to use the Handlers option which is under Fed Admin and all the related codi

help with multi-update
Now sure how to ask this really....
10g database if that matters.

I have a customer

split string
Hi all

i have some names (imploded by comma):
Code: toronto,paris,madrid
Now, i would

problem with php server update from mid 2009
Hi,

I have this navigation menu on 2 websites which used to work just fine. After a recent up

Select question
Hi,

First I would like to say that php is pretty new for me..
so please don't shoot me if

session variables not working anymore
hello,
i use sessions to handle authentication within my site. my host has been changing a lot of

Why is the logic of this simple code not working?
Hey, I'm trying to determine if a table already exists in mysql, but doing a query first with mysql_

Image upload - determine folder
I have an upload script that may be accessed from different directories. Problem is, the script is m

Basic Question about Threading and PHP...
I have a page that I am working on and it is taking several hours to process. The basics of what th

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