gmp_fact

(PHP 4 >= 4.0.4, PHP 5)

gmp_fact — Fattoriale

Descrizione

resource gmp_fact ( int $a )

Calcola il fattoriale (a!) di a.

add a note User Contributed Notes gmp_fact - [1 notes]

down

-1

ghsot at ghost-tech dot com dot au ¶

2 years ago


Alternative method of calculating factorials.



<?php

function fact($n){

if($n > 170){return 0;} //This function can only calculate the factorial of numbers below 171



$i = $a = 1;

while ($i<=$n){

$a = $a * $i;

$i++;

}

$a = sprintf('%f', $a); //Convert from Scientific notation

return substr($a, 0, -7); //Remove the trailing decimal places

}



echo fact(171); //Returns 0

echo "<br />";

echo fact(12); //Returns 479001600

?>

add a note