Java Factorial factorial(int n)

Description

Returns n!

License

Open Source License

Parameter

Parameter	Description
n	an int

Return

n!

Declaration

public static int factorial(int n) 

Method Source Code

//package com.java2s;

public class Main {
    /** Returns n!/*  www. jav  a 2  s  .c o  m*/
     * @param n an int
     * @return n!
     */
    public static int factorial(int n) {
        int returnValue;
        if (n < 0) {
            throw new IllegalArgumentException("Illegal value: " + n);
        } else if ((n == 0) || (n == 1)) {
            returnValue = 1;
        } else {
            returnValue = n * factorial(n - 1);
        }
        return returnValue;
    }

    /** Returns n!
     * @param n a long
     * @return n!
     */
    public static double factorial(double n) {
        double returnValue;
        if (n < 0.0) {
            throw new IllegalArgumentException("Illegal value: " + n);
        } else if ((n == 0) || (n == 1)) {
            returnValue = 1.0;
        } else {
            returnValue = n * factorial(n - 1.0);
        }
        return returnValue;
    }
}

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