gmp_fact
(PHP 4 >= 4.0.4, PHP 5)
gmp_fact -- Factorial
Description
resource
gmp_fact
( int a )
Calculates factorial (
a!
) of
a
.
例子 1.
gmp_fact()
example
<?php
$fact1
=
gmp_fact
(
5
);
// 5 * 4 * 3 * 2 * 1
echo
gmp_strval
(
$fact1
) .
"\n"
;
$fact2
=
gmp_fact
(
50
);
// 50 * 49 * 48, ... etc
echo
gmp_strval
(
$fact2
) .
"\n"
;
?>
|
The printout of the above program will be:
120
30414093201713378043612608166064768844377641568960512000000000000
|
|