FUNCTION GAMMA(X)
C***BEGIN PROLOGUE  GAMMA
C***DATE WRITTEN   770601   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  C7A
C***KEYWORDS  GAMMA FUNCTION,SPECIAL FUNCTION
C***AUTHOR  FULLERTON, W., (LANL)
C***PURPOSE  Computes the Gamma function.
C***DESCRIPTION
C
C GAMMA computes the gamma function at X, where X is not 0, -1, -2, ....
C GAMMA and X are single precision.
C***REFERENCES  (NONE)
C***ROUTINES CALLED  CSEVL,GAMLIM,INITS,R1MACH,R9LGMC,XERROR
C***END PROLOGUE  GAMMA