SLATEC Routines --- FAC ---

*DECK FAC
      FUNCTION FAC (N)
C***BEGIN PROLOGUE  FAC
C***PURPOSE  Compute the factorial function.
C***LIBRARY   SLATEC (FNLIB)
C***CATEGORY  C1
C***TYPE      SINGLE PRECISION (FAC-S, DFAC-D)
C***KEYWORDS  FACTORIAL, FNLIB, SPECIAL FUNCTIONS
C***AUTHOR  Fullerton, W., (LANL)
C***DESCRIPTION
C
C FAC(N) evaluates the factorial function of N.  FAC is single
C precision.  N must be an integer between 0 and 25 inclusive.
C
C***REFERENCES  (NONE)
C***ROUTINES CALLED  GAMLIM, R9LGMC, XERMSG
C***REVISION HISTORY  (YYMMDD)
C   770601  DATE WRITTEN
C   890531  Changed all specific intrinsics to generic.  (WRB)
C   890531  REVISION DATE from Version 3.2
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900315  CALLs to XERROR changed to CALLs to XERMSG.  (THJ)
C***END PROLOGUE  FAC