Calculates the factorial of the given number. - Java java.lang

Java examples for java.lang:Math Geometry Shape

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Description

Calculates the factorial of the given number.

Demo Code

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public class Main{
    /**
     * Calculates the factorial of the given number.
     *
     * @param number an integer value indicating the number to calculate the factorial of.
     * @return the factorial of the given number.
     * @throws IllegalArgumentException if the number is less than 0.
     */
    public static int factorial(int number) {
        Assert.argument(number >= 0,
                "The number to calculate the factorial of must be greater than equal to 0!");

        int result = 1;

        while (number > 0) {
            result *= number--;
        }

        return result;
    }
}

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