class Student {
  String name;
  int age;
  List<String> courses;
  final String? image;

  Student(
    this.name,
    this.age,
    this.courses, {
    this.image
  });

  static String getYearWord(int age) {
    if(age == -1){
      return "Undefined";
    }
    if (age % 10 == 1) {
      return age.toString() + " год";
    } else if (age % 10 < 5 && age % 10 != 0) {
      return age.toString() + " года";
    } else {
      return age.toString() + " лет";
    }
  }

  void displayInfo() {
    print('Name: $name, Age: $age');
    print('Courses: ${courses.join(", ")}');
  }
}