Factorial (Apache Commons Numbers 1.2)

java.lang.Object
- org.apache.commons.numbers.combinatorics.Factorial

public final class Factorial
extends Object

Factorial of a number.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static double`	`doubleValue(int n)`	Computes the factorial of `n`.
`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

- 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).
  - doubleValue
```
public static double doubleValue(int n)
```
    Computes the factorial of n.
    The result should be small enough to fit into a double: The largest n for which n! does not exceed Double.MAX_VALUE is 170. Double.POSITIVE_INFINITY is returned for n > 170.
    
    Parameters:
    
    n - Argument.
    
    Returns:
    
    n!
    
    Throws:
    
    IllegalArgumentException - if n < 0.
    
    Since:
    
    1.1