Java Factorial factorial(int n)

Description

Find the factorial of the input number

License

Open Source License

Parameter

Parameter	Description
n	a positive number to find the factorial of

Exception

Parameter	Description
IllegalArgumentExcpetion	for negative inputs

Return

the factorial of the number

Declaration

public static int factorial(int n) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    /**//from  ww  w.  jav a 2  s .  c o  m
     * Find the factorial of the input number
     * @param n a positive number to find the factorial of
     * @return the factorial of the number
     * @throws IllegalArgumentExcpetion for negative inputs
     */
    public static int factorial(int n) {
        if (n < 0) {
            throw new IllegalArgumentException("Input should be nonnegative.");
        } else if (n < 2) {
            return 1;
        } else {
            int accum = 1;
            for (int i = n; i > 0; i--)
                accum *= i;

            return accum;
        }
    }
}

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