How to write simple calculator program in php with html

calculator.php


 <?php 

extract($_POST);

if(isset($save))

{

switch($ch)

{

case '+':

$res=$fn+$sn;

break;

case '-':

$res=$fn-$sn;

break;

case '*':

$res=$fn*$sn;

break;

case '/':

$res=$fn/$sn;

break;

}

}

?>

<!DOCTYP html>

<html>

<head>

<title>Calculator- switch case</title>

</head>

<body>

<form method="post">

<table border="1" align="center">

<tr>

<th>Your Result</th>

<th><input type="number" readonly="readonly" disabled="disabled" value="<?php  echo @$res;?>"/></th>

</tr> 

<tr>

<th>Enter your First num</th>

<th><input type="number" name="fn" value="<?php  echo @$fn;?>"/></th>

</tr> 

<tr>

<th>Enter your Second num</th>

<th><input type="number" name="sn" value="<?php  echo @$sn;?>"/></th>

</tr>

<tr>

<th>Select Your Choice</th>

<th>

<select name="ch">

<option>+</option>

<option>-</option>

<option>*</option>

<option>/</option>

</select>

</th>

</tr>

<tr>

<th colspan="2">

<input type="submit" 

name="save" value="Show Result"/>

</th>

</tr>

</table>

</form>

</body>

</html>

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