create calculater
<?php
extract($_POST);
if(isset($save))
{
switch($ch)
{
case '+':
$res=$fn+$sn;
break;
case '-':
$res=$fn-$sn;
break;
case '*':
$res=$fn*$sn;
break;
}
}
?>
<!DOCTYP html>
<html>
<head>
<title>Calculator- switch</title>
</head>
<body>
<form method="post">
<table border="1" align="center">
<tr>
<th>Your Result</th>
<th><input type="number" readonly="readonly" disabled="disabled" value="<?php echo @$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>
</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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