This routine approximates factorials and their logarithms by Stirling's approximation.

The calls are

       CALL STIRLING(FACT,I,IER)

and

       CALL STIRLOG(FACTL,I,IER)
where

FACT = the computed factorial
FACTL = computed logarithm of FACT
I = the number for which the factorial is computed   
IER = error return; =0 normal return, =−1 I was negative
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