Factorial Factorial_sub

Factorial() Function Factorial ( N As  Long, Optional Info As  Long  ) Factorial function Purpose Computes the factorial. Returns Double n!. Parameters [in] N Argument n. (N >= 0) [out] Info (Optional) = 0: Successful exit. = -1: The argument N had an illegal value. (N < 0) = 1: Floating point range error. Reference boost/math/special_functions