dart class

main.dart

void main() {
  Human jenny = Human(startingHeight: 15);
  print(jenny.height);

  Human jemes = Human(startingHeight: 20);
  print(jemes.height);

  jemes.talk("hello");
}

class Human {
  double height;
  int age = 0;

  Human({double startingHeight}) {
    height = startingHeight;
  }

  void talk(String whatToSay) {
    print(whatToSay);
  }
}