class pp
{
    static void add(double x,double y)
    {
        double z;
        z=x+y;
        System.out.println("z="+z);
        x=x+3.2;
        y=y+1.2;
        System.out.println("x="+x+"\ty="+y);
    }
    static double add1(double y1,double y2)
    {
        double z;
        z=y1+y2+2.9;
        return z;
    }
}
public class p4_15
{
    public static void main(String []args)
    {
        int a=2,b=7;
        double f1=2,f2=4,f3;
        pp p1=new pp();
        p1.add(a,b);
        System.out.println("a="+a+"\tb="+b);
        f3=2+p1.add1(f1,f2);
        System.out.println("f1="+f1+"\tf2="+f2+"\tf3="+f3);
    }
}