scripting help

benzspida

can any one help me with this script I am just gettin started with PHP

I am trying to create an calculation script that would
calculate the

Constant: PI = 3.1415926535
Radius, area, and circumference of a circle .

this is what i have done with the script so far I am getting results, which is good but not

getting the calculation of the area and circumference of the circle

<html>
<head>
<title>
Calculation Form
</title>
</head>
<body>

<?php
if (!isset($POST['submit'])) {
$result = '<form action="" . method="post">' .
'<input type="text" name="radius" />' .
'<input type="submit" name="submit" value="Calculate" />' .
'</form>';
} else {
define('M_PI', '3.141....');
$circumference = M_PI $POST['radius'] 2;
$area = M_PI * pow($_POST['radius'], 2);
$result .= 'Circumference = ' . $circumference . ' units<br />';
$result .= 'Area = ' . $area . ' sq. units<br />';
print " $result";
}

?>
<html>
<head>
<title></title>
</head>

Do i have to define M_PI? to get the calculations.
thanks for the help

khendar

M_PI is a built in constant which you dont need to define because it is preset.

VirtualX

you dont need to define M_PI as this is predefined in PHP, take out 'define' you should get the calculations you want as i cant see anything else wrong with the script.

VirtualX

lol, you beat me to it khendar

benzspida

thanks alot

benzspida

still not gettin the calculations

i am getting

Area = 0
and Circumference= 0

what i am looking for is a response like this

The Area of the circle = 2290.22......

The Circumference of the circle= 169.64.......

Weedpacket

Check that $POST['radius'] contains the correct value (though it should; the field has the right name, after all) (add a line $result .= 'Radius = ' . $POST['radius'] . ' units<br />';, say).

Incidentally, you're putting out two <html>....<body> sequences - once before the if/else and once after.