factorial

Computes and returns the factorial $n!$ for a given number $n$ .

$$n! = n \times (n-1) \times \cdots \times 1$$

$18!$ is the largest factorial GameMaker can precisely compute. It may appear to produce correct results up to $22!$ but computations using them are dubious and precision decreases as they get larger.

factorial(number): Returns the factorial of a given number.

COPY/// @func   factorial(number)
///
/// @desc   Returns the factorial of a given number. Numbers
///         larger than 18 produce inaccruate results due to
///         floating-point precision limitations.
///
/// @param  {real}      number      non-negative integer
///
/// @return {real}      factorial of given number
///
/// GMLscripts.com/license

function factorial(number)
{
    if (number <= 1) return 1;
    return number * factorial(number - 1);
}

Contributors: xot

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