RoomSize

import java.lang.Math;

class main {
  public static void main(String[] args) {
    
    RoomSize room = new RoomSize(8,8,11);
    
    int areaCovered = 3;  //one can of paint covers 3 sq ft
    
    int floorArea = room.floorArea();
    int wallArea = room.wallArea();
    int cansNeeded = wallArea/areaCovered;
    
    System.out.println("The floor area is "+floorArea+" sq ft.");
    System.out.println("The wall area is "+wallArea+" sq ft.");
    System.out.println("You need "+cansNeeded+" cans of paint to paint the walls.");

    CircRoomSize circleRoom = new CircRoomSize(6,10);
    
    int circFloorArea = circleRoom.floorArea();
    int circWallArea = circleRoom.wallArea();
    int circCansNeeded = circWallArea/areaCovered;
    
    System.out.println("The circle room floor area is "+circFloorArea+" sq ft.");
    System.out.println("The circle room wall area is "+circWallArea+" sq ft.");
    System.out.println("You need "+circCansNeeded+" cans of paint to paint the circle room walls.");
    
    int pi = (int) Math.PI;
    System.out.println("pi = "+pi);
  }
}

class RoomSize {
  int roomWidth;    //sq ft
  int roomHeight; 	//sq ft
  int roomLength;	//sq ft
  
  public RoomSize(int roomWidth, int roomHeight, int roomLength){
    this.roomWidth=roomWidth;
    this.roomHeight=roomHeight;
    this.roomLength=roomLength;
  }  
  public int floorArea(){
    return this.roomWidth*this.roomLength;
  }
  public int roomPerimeter(){
    return this.roomWidth*2+this.roomLength*2;
  }
  
  public int wallArea(){
    return roomPerimeter()*this.roomHeight;
  }
}

import java.lang.Math;

class CircRoomSize extends RoomSize{
  public CircRoomSize(int roomRadius, int roomHeight){
    super(roomRadius,roomHeight,roomRadius);
  }
  public int floorArea(){
    return (int) (this.roomWidth*this.roomWidth*Math.PI);
  }  
  public int roomPerimeter()
  {
    return (int) (this.roomWidth*2*Math.PI);
  }
}