class Book {
  String title;
  String author;
  int numPages;
  boolean isCopyrighted;
  
  Book( String _title, String _author, int _numPages, boolean _isCopyrighted ) {
      this.title = _title;
      this.author = _author;
      this.numPages = _numPages;
      this.isCopyrighted = _isCopyrighted;
    }

// ( template for book-handling functions 
// ... funcForBook( /* Book this */ ) {
//    ... this.author
//    ... this.title
//    ... this.numPages
//   ... this.isCopyrighted
//    }
// 
    
    
  double readingTime( /* Book this */ ) {
    return 2 * this.numPages;
    }
    
  @Override
  public String toString( /* Book this */ ) {
    return this.author
         + ", by "
         + this.title
         + this.numPages
         + (this.isCopyrighted   ? "©" : "" );
    }
    
  void tests() {
    Book b0, b1;
    b1 = new Book( "The Cat in the Hat", "Seuss", 37, true );
    b0 = new Book( "Soul and Wit", "Barland", 0, false );
    
    //b0.title;
    //b1.isCopyrighted;

    
    assert (new Book( "The Cat in the Hat", "Seuss", 37, true )).readingTime() == 74;
    assert b0.readingTime() == 0;
    /*
    assert (new Book( "The Cat in the Hat", "Seuss", 37, true )).toString()
           .equals( "The Cat in the Hat, by Seuss (37pp), ©" );
    assert b0.toString().equals( "Soul and Wit, by Barland (0pp)" );
    */
    }

 Book funcForBook( /* Book this */ String newAuthor, int addedPages  ) {
    return new Book( this.author + newAuthor,
                     "Son of " + this.title,
                     this.numPages + newPages,
                     false );
    }
 
    
  }