main.dart

class Book {
  // Private Properties
  String? _title;
  String? _author;
  double? _price;

  // Getter to read the private property _title
  String get title => this._title!;

  // Setter to update the private property _title
  set title(String title) => this._title = title;

  // Getter to read the private property _author
  String get author => this._author!;

  // Setter to update the private property _author
  set author(String author) => this._author = author;

  // Getter to read the private property _price
  double get price => this._price!;

  // Setter to update the private property _price
  set price(double price) {
    if (price < 0) {
      throw Exception("Price cannot be negative");
    }
    this._price = price;
  }
}

void main() {
  // Create an object of the Book class
  Book myBook = Book();
  // Set book properties using setters
  myBook.title = "The Great Gatsby";
  myBook.author = "F. Scott Fitzgerald";
  myBook.price = 12.99;

  // Access and display book details using getters
  print("Title: ${myBook.title}");
  print("Author: ${myBook.author}");
  print("Price: \$${myBook.price.toStringAsFixed(2)}");
}