<?php



if ($_POST['post'] == "true")

{



	$decimal = $_POST['dec_num'];

	$decimal = round($decimal);

	$divisor = 0;

	$remainder = 0;

	$remainders = array();

	$iteration = 0;

	$i = 0;



	$next = $decimal;



	if ($decimal > 256)

		die("<b>ERROR</b>: Overflow");



	if ($decimal < 0)

		die("<b>ERROR</b>: Negative Number");



	for(;;)

	{



		for(;;)

		{



			// highest divisor found, but it's too high, so go back a step

			if ($divisor > $next)

			{

				$divisor /= 2;

				$iteration--;

				break;

			}



			$iteration++;

			$divisor = 2 * $iteration;



		}



		$remainder = $next - (2 * $iteration);



		// failsafe

		if ($remainder > 1)

			die("<b>ERROR</b>: Invalid Remainder");



		$remainders[$i] = $remainder;



		// cannot apply division algorithm anymore

		if ($iteration == 0)

			break;



		$divisor = 1;

		$i++;

		$next = $iteration;

		$iteration = 0;



	}



	$sizeof = count($remainders);

	for ($k = 8; $k > $sizeof; $k--)

		$bin_num .= 0;





	for ($j = $sizeof; $j + 1 > 0; $j--)

		$bin_num .= $remainders[$j];



	/*

	for ($j = 0; $j < $i + 1; $j++)

		echo "remainders[$j]:" . $remainders[$j] . "<br>";

	*/

}



?>

<h1>Decimal to Binary Converter</h1>

<h2>Unsigned, 8 bits</h2>

<h3>Integers 0 - 255</h3>

<form id="conv_form" name="conv_form" method="POST">

<b>Decimal Number</b>: <input type="text" name="dec_num" id="dec_num" maxlength="3" size="1" class="input"><br /><br />

<input type="hidden" name="post" value="true">

<input type="submit" value="Convert" id="conv_but" class="input">



<?php



if (isset($bin_num))

	echo "<br /><br /><b>Your 8-bit Binary Number is</b>: " . $bin_num;



?>