# Caclulate the factorial of N : Math « Development Class « Java

Caclulate the factorial of N

```
/*
* JGraphT : a free Java graph-theory library
*
*
* Project Info:  http://jgrapht.sourceforge.net/
* Project Creator:  Barak Naveh (http://sourceforge.net/users/barak_naveh)
*
* (C) Copyright 2003-2007, by Barak Naveh and Contributors.
*
* This library is free software; you can redistribute it and/or modify it
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* 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
*
* 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.
*/
/* -----------------
* MathUtil.java
* -----------------
* (C) Copyright 2005-2007, by Assaf Lehr and Contributors.
*
* Original Author:  Assaf Lehr
* Contributor(s):   -
*
* \$Id: MathUtil.java 568 2007-09-30 00:12:18Z perfecthash \$
*
* Changes
* -------
*/

/**
* Math Utilities. Currently contains the following:
* <li>factorial(int N) - caclulate the factorial of N (aka N!)
*
* @author Assaf
* @since May 30, 2005
*/
public class MathUtil
{
//~ Methods ----------------------------------------------------------------

public static long factorial(int N)
{
long multi = 1;
for (int i = 1; i <= N; i++) {
multi = multi * i;
}
return multi;
}
}

// End MathUtil.java

```

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