org.apache.commons.numbers.combinatorics

Class Factorial

java.lang.Object

org.apache.commons.numbers.combinatorics.Factorial

public class Factorial
extends Object

Factorial of a number.

Constructor Summary

Constructors

Constructor and Description
Factorial()

Method Summary

Modifier and Type	Method and Description
static long	value(int n) Computes the factorial of n.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Factorial

public Factorial()

Method Detail

value

public static long value(int n)

Computes the factorial of n.

Parameters:

n - Argument.

Returns:

n!

Throws:

IllegalArgumentException - if n < 0.

IllegalArgumentException - if n > 20 (the factorial value is too large to fit in a long).