CFLib.org – Common Function Library Project

Description:
Returns the factorial (n!) for a given positive integer.

Return Values:
Returns a simple value.

Example:

<CFSET n=5>
  <CFOUTPUT>
  Given n=5
  n! is #Factorial(n)#
  </CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Returns the factorial (n!) for a given positive integer.
 * Note that a recursive function call is NOT used here for performance reasons.
 * 
 * @param integer      Any non negitive integer. 
 * @return Returns a simple value. 
 * @author Rob Brooks-Bilson (rbils@amkor.com) 
 * @version 1.0, July 18, 2001 
 */
function Factorial(integer)
{
  Var factorial=1;
  Var i=integer;  
  while (i GT 0) {
    factorial = factorial*i;
    i = i-1;
    }
  Return factorial;
}