Java Factorial factorial(int n)

Description

factorial

License

Open Source License

Return

the n!

Declaration

public static long factorial(int n) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2010 University of Illinois at Urbana-Champaign and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:/*www . j a  v a  2  s .  c om*/
 *    UIUC - Initial API and implementation
 *******************************************************************************/

public class Main {
    /** @return the <i>n!</i> */
    public static long factorial(int n) {
        if (n < 0)
            throw new IllegalArgumentException();
        if (n < 2)
            return 1;

        long result = 1;
        for (int i = n; i >= 2; i--)
            result *= i;
        return result;
    }
}

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