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 logl()                  Calculate Long Double Natural Logarithm

 #include   <math.h>
 #include   <errno.h>

 long double logl(x);
 long double x;                 Long double

    This is the long double precision version of log(); it calculates
    and returns the long double precision natural logarithm of x. See
    log() for more information.

    Returns:    The natural logarithm if successful; -LHUGE_VAL
                if not.

 Portability:   Not supported by the ANSI standard.