public class exec {

    /**
     * @param args
     */
      static void add(double x,double y){
          double z;
          z=x+y;
          System.out.println("z="+z);
          
      }
      static double add1(double y1,double y2){
          System.out.println(++y1+y2+2.9);
           return ++y1+y2+2.9;
      }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
           double f1=2,f2=4;
           add(f1,add1(f1,f2));
    }

}