third_class.dart

void main() {
  
  Remote r = Remote();
  r.numberOfButton = 20;
  print(r.numberOfButton);
  
  Remote r2 = Remote();
  print(r2.numberOfButton);
 

  // positional argument
  r.gotoChannel(1);

  // String interpolation
  print('Number of buttons ${r.numberOfButton}');

  r.play();

  r.play(num: 6);

  r.pause(num: 6);

  r.printSomething(3, 4, 5, '', '', '');

  r.printSomething1(b: 4, a: 4);
  
  
}

class Remote {
  
  int numberOfButton = 10;

  // returnType functionName(){}

  void turnOn() {
    print('Turn On Called');
  }

  void turnOf() {
    print('Turn off Called');
  }

  // positional argument
  void gotoChannel(int num) {
    // String interpolation
    print('Changed channel to $num');
  }

  // named argument / optional argument
  void play({int? num}) {
    // String interpolation
    print('Changed channel to $num');
  }

  // named required argument
  void pause({required int num}) {
    print('paused ' + num.toString());
  }

  void printSomething(int a, int b, int c, String aa, String bb, String cc) {
    print('Something');
  }

  void printSomething1(
      {required int a, int? b, int? c, String? aa, String? bb, String? cc}) {
    print('Something');
  }
}