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

Help with email validation please...
Hi,
Please could you help.
I have a register.php login page where users register, the detail

Parse Error with doctype
I'm getting a parse error with this simple code. I don't get it. It worked one time then when I relo

Default TimeZone
The server I'm working with is hosted in America so all times inserted into the database are coming

do while conditions
i want to display 6 images in a 2x3 table
now what would be the correct logic to
count that th

Simpler method of getting variables from mysql
Hi Guys,

I'm trying to streamline my CMS's code and as I was writing a new page it occured to

If a record matches an existing record do nothing
So I don't know if I should put this here or in mysql, but what my script is for is for people to ad

for loop without same $i digits?
Hi,

Can some guru please advise how can I accomplish this with a simple for loop ?

I

Multiple forms on the same page (safari)
Hello everyone,

I have 3 forms on the same page, that opens in a new window and submits to a

Fatal error: Call to a member function fetchrow() on a non-object in C:xamppht
okay i have this query and everytime i add `item_id`=? to it... it gives me the error in the title..

Something like an INI editor or a DelimitedText-Editor
Hi all,

Am very, very, very new to PHP and not sure if I should be posting this to a Javascri