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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <math.h>
 
  Syntax:    double _j0( double x );
             double _j1( double x );
             double _jn( int n, double x );
             double _y0( double x );
             double _y1( double x );
             double _yn( int n, double x );
 
  Returns:   the result of a Bessel function of <x> if successful.
             (_y0, _y1, and _yn return -HUGE_VAL if <x> is negative.)
             errno: EDOM (set by _y0, _y1, and _yn if <x> is negative)
 
  See also:  _j0l, _j1l, _jnl, _y0l, _y1l, _ynl, _matherr
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