PHP
php
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<!DOCTYPE html>
<html>
<head>
<title>sample html file</title>
<meta charset="UTF-8" />
</head>
<body style="font-size:25px;">
<form method="post">
Please, enter the power of the expansion: <br/>
<input type="number" name="0"/><br/>
<input type="submit" value="Send"/>
</form>
<p>
<?php
$var="hi";
if($_POST!=Null)
$var =$_POST[0];
if($var>0)
echo "<br/>";
else if($var=="hi")
echo " ";
else
echo $var." is not a valid power for an expansion!<br/>";
function coeffHelper($n,$k){
if ($n>$k)
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OUTPUT
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