note 86754 added to function.sqrt
| From: | luruke at osu1 dot php dot net | Date: | Sun, 02 Nov 2008 11:23:35 +0000 |
| Subject: | note 86754 added to function.sqrt | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-146036@lists.php.net to get a copy of this message | ||
My interpretation of sqrt() function:
<?php
function __strlen($text){
$i=0; while(isset($text[$i])) $i++;
return $i;
}
function __round($float, $offset){
$float = (string) $float;
for($temp='', $dot=false, $i=0; $i<__strlen($float); $i++){
if($dot) $offset--;
if($float[$i] == ".") $dot = true;
$temp .= $float[$i];
if($offset == 0) break;
}
return (float) $temp;
}
function __sqrt($num){
$precision = 9;
for($tmp=1;;){
$sqrt = ($tmp+$num/$tmp)/2;
if(__round($sqrt*$sqrt,$precision)==$num)
return __round($sqrt,$precision);
else
$tmp = $sqrt;
}
}
print __sqrt(569432981)."\n";
?>
----
Server IP: 213.92.11.19
Probable Submitter: 151.53.48.127
----
Manual Page -- http://www.php.net/manual/en/function.sqrt.php
Edit -- https://master.php.net/note/edit/86754
Del: integrated -- https://master.php.net/note/delete/86754/integrated
Del: useless -- https://master.php.net/note/delete/86754/useless
Del: bad code -- https://master.php.net/note/delete/86754/bad+code
Del: spam -- https://master.php.net/note/delete/86754/spam
Del: non-english -- https://master.php.net/note/delete/86754/non-english
Del: in docs -- https://master.php.net/note/delete/86754/in+docs
Del: other reasons-- https://master.php.net/note/delete/86754
Reject -- https://master.php.net/note/reject/86754
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