PHP | gmp_fact() for large factorials
The gmp_fact() is a built-in function in PHP which is used to calculate the factorial of a GMP number (GNU Multiple Precision : For large numbers).
Syntax:
gmp_fact ( $num )
Parameters: This function accepts a GMP number as a mandatory parameter as shown in the above syntax. It can be a GMP object in PHP version 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.This function calculates the factorial of this number and returns it.
Return Value: This function returns a GMP number which is the factorial of the number passed as parameter.
Examples:
Input : "9" Output : 362880 Input : 25 Output : 15511210043330985984000000
Below programs illustrate the gmp_fact() function in PHP :
Program 1:
<?php $fact = gmp_fact(5); echo gmp_strval($fact); ?> |
Output:
120
Program 2:
<?php $fact = gmp_fact(25); echo gmp_strval($fact); ?> |
Output:
15511210043330985984000000
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