Math
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<?php
if (isset($num1) && isset($num2))
{
function BinaryAdd($num1,$num2)
{
$carry = $num1 & $num2;
do
{
$carry = $carry << 1;
$num1 = $num1 ^ $num2;
$sum = $num1 ^ $carry;
$num2 = $carry;
$carry = $num1 & $num2;
} while($carry != 0);
return $sum;
}
function BinarySubtract($num1,$num2)
{
//Compute Two's Compliment
$num2 = ~ $num2;
$num2 = BinaryAdd($num2,1);
$diff = BinaryAdd($num1,$num2);
return $diff;
}
//Make sure form data is treated like an int
$number1 = (int)$num1;
$number2 = (int)$num2;
$sum = BinaryAdd($number1,$number2);
$diff = BinarySubtract($number1,$number2);
echo "The Sum is $sum<BR>";
echo "The Difference is $diff";
} else {
?>
<Form Action="<? echo $PHP_SELF ?>" Method=Post>
Enter an Integer <Input Type=text name="num1"><BR>
Enter a Second Integer <Input Type=text name="num2"><BR>
<Input Type=Submit Value="Add and Subtract Them">
</Form>
<? } ?>
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Usage Example
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