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  Include:   <math.h>, <errno.h>
 
  Syntax:    double log( double x );
             double log10( double x );
             long double logl( long double x );
             long double log10l( long double x );
 
  Returns:   the logarithm of <x> if successful, or -HUGE_VAL if not.
             errno: EDOM (if <x> is less than 0)
                    ERANGE (if <x> is equal to 0)
 
  See also:  exp, matherr, pow
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