Java Factorial factorial(long n)

Description

This function computes the factorial of an long integer

License

Open Source License

Parameter

Parameter	Description
n	long integer

Return

factorial n!

Declaration

public static long factorial(long n) 

Method Source Code

//package com.java2s;
/**/*from  w  w w  .  j a  v  a 2  s  .  co  m*/
 * Copyright notice
 *
 * This file is part of the Processing library `gwoptics'
 * http://www.gwoptics.org/processing/gwoptics_p5lib/
 *
 * Copyright (C) 2009 onwards Daniel Brown and Andreas Freise
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

public class Main {
    /**
     * This function computes the factorial of an long integer
     *
     * @param n long integer
     * @return factorial n!
     */
    public static long factorial(long n) {
        long fac = 1;
        if (n < 0) {
            throw new RuntimeException("Underflow error in factorial");
        } else if (n > 20) {
            throw new RuntimeException("Overflow error in factorial");
        } else if (n == 0) {
            return 1;
        } else {
            for (int i = 1; i <= n; i++) {
                fac = fac * i;
            }
        }
        return fac;
    }
}

Related

1. factorial(int value)
2. factorial(int x)
3. Factorial(int x)
4. factorial(int x)
5. factorial(long l)
6. factorial(long num)
7. factorialAsDouble(int n)
8. factorialAsDoubleIncludeDivisor(int n, double divisor)
9. factorialCheckBounds(int n)