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import tester.Tester;

interface IBook{
	//how many days left?
	public int daysOverdue();
	public boolean isOverdue();
	public int computeFine();
	
}

abstract class ABook implements IBook{
	String title;
	
	
	ABook(String title){
		this.title = title;
		
	}
	
	//
	public abstract int daysOverdue();
	public abstract boolean isOverdue();
	public abstract int computeFine();
}

class Book extends ABook{
	String author;
	int dayTaken;
	Book(String title, int dayTaken,String author){
		super(title);
		this.dayTaken = dayTaken;
		this.author = author;
		
		
	}
	/* tmpl
	 * fields:
	 * this.author ... String
	 * this.dayTaken ... int
	 * methods:
	 * this.daysOverdue() ... int
	 
	 */
	public int daysOverdue(){
		return this.dayTaken - 14;
	}
	public boolean isOverdue(){
		
	return this.daysOverdue() > 0;
		
	}
	
	public int computeFine(){
		if (this.isOverdue()){
		return (this.daysOverdue() * 10);}
		else {return 0; }
	}
				
		
		
	}
		
	
	


class RefBook extends ABook{
	int dayTaken;
	RefBook(String title, int dayTaken){
		super(title);
		this.dayTaken = dayTaken;
	}
	public int daysOverdue(){
		return this.dayTaken - 2;
	}
	public boolean isOverdue(){
		return this.daysOverdue() > 0;
}
	public int computeFine(){
		if (this.isOverdue()){
		return (this.daysOverdue() * 10);}
		else {return 0; }
}
}

class AudioBook extends ABook{
	String author;
	int dayTaken;
	AudioBook(String title, int dayTaken,String author){
		super(title);
		this.dayTaken = dayTaken;
		this.author = author;
}
	public int daysOverdue(){
		return this.dayTaken - 14;
}
	public boolean isOverdue(){
		return this.daysOverdue() > 0;
}
	public int computeFine(){
		if (this.isOverdue()){
		return (this.daysOverdue() * 20);}
		else {return 0; }

}
}

class ExamplesBook{
	IBook htdp = new Book("htdp",10,"harry");
	boolean testBook(Tester t)
	{return t.checkExpect (htdp.daysOverdue(),-4)&&
			t.checkExpect (htdp.isOverdue(),false)&&
			t.checkExpect (htdp.computeFine(),0);}
	}