void jn_zeros ( int n, int nt, double z[] );
void yn_zeros ( int n, int nt, double z[] );
void jyndd ( int n, double x, double &bjn, double &djn, double &fjn, 
  double &byn, double &dyn, double &fyn );
void jyzo ( int n, int nt, double rj0[], double rj1[], double ry0[], 
  double ry1[] );