Factorial Factorial_sub

Factorial_sub() Sub Factorial_sub ( Ret As  Double, N As  Long, Optional Info As  Long  ) Factorial function (Subroutine version) Purpose Computes the factorial. Parameters [out] Ret n!. [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