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  Include:   <math.h>
 
  Syntax:    long double _j0l( long double x );
             long double _j1l( long double x );
             long double _jnl( int n, long double x );
             long double _y0l( long double x );
             long double _y1l( long double x );
             long double _ynl( int n, long double x );
 
  Returns:   the result of a Bessel function of <x> if successful.
             (y0l, y1l, and ynl return -HUGE_VAL if <x> is negative.)
             errno: EDOM (set by y0l, y1l, and ynl if <x> is negative)
 
  See also:  j0, j1, jn, matherr, _matherrl, y0, y1, yn
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