fac.f
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