Stut wrote:
On 17 Nov 2008, at 14:31, Nathan Rixham wrote:
if you really want a challenge try this one..
task: add the numbers 5 and 17 together, using php, without using the
+ operator. fill it in:
function add($a , $b) {
//code here but no + - / * operators
return $answer;
}
echo add(5, 17);
Elemental my dear Mr Rixham...
function add($a , $b)
{
$answer = $a ^ $b;
while (0 != ($a & $b))
{
$b = ($a & $b) << 1;
$answer = $answer ^ $b;
}
return $answer;
}
-Stut
what an answer; very nice and indeed full marks mr stut!
now then..
echo add(5,17) . ' ' . (5 + 17) . PHP_EOL;
echo add(-5,17) . ' ' . (-5 + 17) . PHP_EOL;
echo add(5,-17) . ' ' . (5 + -17) . PHP_EOL;
echo add(-5,-17) . ' ' . (-5 + -17) . PHP_EOL;
(can you tell I've been down this route before?)
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