import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".


    class Cylinder{
        int radius,height;
        void Setradius (int a){
            radius=a;
        }
        void Setheight (int h){
             height=h;                      
        }

    /* 
    class  {
        int x;
    }  void set x(int x){
        this.x = x;
    }   void get x(){
        return x;
    }     hum x ko hi define kr ske h this lga kr 
    */
        int  Getradius2(){
            return radius;
        }
        int Getheight2(){
            return height;
        }
        float Getvolume(){
            float volume = 3.14f*(radius*radius)*height;
            return volume;
       }
    }
  class Main {  
    
    public static void main(String[] args) 
    {
        Cylinder c1 = new Cylinder();
        System.out.println("chapter 9 practise set");
        System.out.println("we are back");
       c1.Setradius(25);
        c1.Setheight(10);
        
      
        System.out.println(c1.Getheight2());
        System.out.println(c1.Getvolume());
    }
}