static double cyl ( double r , double h ) {
  if ( r < 0 && h < 0 ) return - 1 ;
  double R = ( 2 * r ) / 3 ;
  double H = ( 2 * h ) / 3 ;
  double V = 3.14 * Math . pow ( R , 2 ) * H ;
  return V ;
}

static double cyl ( double r , double h ) { if ( r < 0 && h < 0 ) return - 1 ; double R = ( 2 * r ) / 3 ; double H = ( 2 * h ) / 3 ; double V = 3.14 * Math . pow ( R , 2 ) * H ; return V ; }
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