<?php session_start(); ?>
<!--
	Title: assignment4b3.php
	Author: Tyler Chang
	Instructor: John Wang
	Due: 3/3/2013
	Goal: Add modulus and power functions to calculator app
-->

<FONT color=blue size=4>
<?php
	// get op and numbers from last page
	$op = $_POST['op'];
	$num1 = $_SESSION['num1'];
	$num2 = $_SESSION['num2'];
	// display
	print "Num1 is $num1<BR>";
	print "Num2 is $num2<BR>";
	print "The opperator is $op<p>";

	if($op == "add") // add the numbers
	{
		$ans = $num1 + $num2;
		print "$num1 + $num2 = $ans";
	}
	else if($op == "sub") // subtract the numbers
	{
		$ans = $num1 - $num2;
                print "$num1 - $num2 = $ans";
	}
        else if($op == "mul") // multiply the numbers
        {
                $ans = $num1 * $num2;
                print "$num1 * $num2 = $ans";
        }
        else if($op == "div") // divide the numbers
        {
                $ans = $num1 / $num2;
                print "$num1 / $num2 = $ans";
        }
	else if($op == "mod") // find remainder
	{
		$ans = $num1 % $num2;
		print "$num1 % $num2 = $ans";
	}
	else if($op == "pow") // find num1 to num2 power
	{
		$ans = 1;
			if($num2 < 0) // raised to a negative power
				for($i=$num2;$i<0;$i++)
					$ans = $ans / ($num1);
			else // raised to a positive power
				for($i=0;$i<$num2;$i++)
					$ans = $ans * $num1;
		print "$num1 ^ $num2 = $ans";
	}
?>
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</FONT>