Calculator.php
<body bgcolor="#CCCCCC">
<form method="post">
Enter Number:<Input type="text" name="txt" />
<br >
<table>
<tr>
<td><input type="radio" name="rd" value="sqrt"/>sqrt</td>
<td><input type="radio" name="rd" value="square"/>square</td>
<td><input type="radio" name="rd" value="sin"/>sin</td>
<td><input type="radio" name="rd" value="cos"/>cos</td>
<td><input type="radio" name="rd" value="tan"/>tan</td>
</tr>
</table>
<br>
<input type="submit" name="Submit" value="Enter" />
</form>
<?php
if(isset($_POST['Submit']))
{
$a=$_POST['txt'];
$b=$_POST['rd'];
$c="square";
$d="sqrt";
$e="sin";
$f="cos";
$g="tan";
if(is_numeric($a))
{
switch($b):
case($c):
echo $a." ";
echo " square is:".($a * $a);
break;
case($d):
echo $a." ";
echo "square root is:".sqrt($a);
break;
case($e):
echo "sin(".$a.")=";
echo sin(deg2rad($a));
break;
case($f):
echo "cos(".$a.")=";
echo cos(deg2rad($a));
break;
case($g):
echo "tan(".$a.")=";
echo tan(deg2rad($a));
break;
endswitch;
}
else
{
echo "Enter number";
}
}
?>
</body>
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