<?php	session_start();

	// calculator session 4
?>

<FONT color=blue size=4>
<?php
	$op = $_POST['op'];	// "add",
	$num1 = $_SESSION['v1'];
	$num2 = $_SESSION['v2'];

	print "The num1 is $num1<BR>";
	print "The num2 is $num2<BR>";
	print "The operator is $op <HR>";

	if($op == "add")
	{
		$ans = $num1 + $num2;
		print "$num1 + $num2 = $ans";
	}
	else if($op == "sub")
    {
    	$ans = $num1 - $num2;
        print "$num1 - $num2 = $ans";
    }
    else if($op == "mul")
    {
        $ans = $num1 * $num2;
        print "$num1 * $num2 = $ans";
    }
    else if($op == "div")
   	{
   		$ans = $num1 / $num2;
        print "$num1 / $num2 = $ans";
    }
    else if($op == "mod")
    {
    	$ans = $num1 % $num2;
    	print "$num1 % $num2 = $ans";
    }
    else if($op == "pow")
    {
    	$ans = pow($num1, $num2);
    	print "$num1 ^ $num2 = $ans";
    }
?>
</FONT>