note 99062 added to function.sqrt
| From: | coelhoduda at hotmail dot com | Date: | Sun, 25 Jul 2010 16:19:31 +0000 |
| Subject: | note 99062 added to function.sqrt | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-171115@lists.php.net to get a copy of this message | ||
uma função bem simples, para podermos entender a lógica de, como funciona a extração
de uma raiz quadrada é a seguinte:
<?php
function raiz($y){
if(is_numeric($y)){
$x = (int)(($y/2)+1);
for($i=0;(($y/$x)!=$x)and($i<14);$i++){
$x = 0.5*(($y/$x)+$x);
}
}
return $x;
}
echo var_dump(raiz(27)); // float(5.1961524227066)
echo "<br>";
echo var_dump(sqrt(27)); // float(5.1961524227066)
echo "<hr>";
echo var_dump(raiz(81)); // float(9)
echo "<br>";
echo var_dump(raiz(81)); // float(9)
?>
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Server IP: 216.235.13.26
Probable Submitter: 74.3.160.66
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