silent-marble-5507

readme.md

silent-marble-5507

Created with <3 with dartpad.dev.

main.dart

void main() {
  Circle circle1 = Circle();
  Circle circle2 = Circle.second(12.4);
  Circle circle3 = Circle.third(radius: 22.3, color: 'blue');

  print('''
  
   Circle 1:
    Area: ${circle1.getArea()};
    Circumference: ${circle1.getCircumference()}
    Description: ${circle1.getDescription()}
    Color: ${circle1.getColor()}
    
    Circle 2:
    Area: ${circle2.getArea()};
    Circumference: ${circle2.getCircumference()}
    Description: ${circle2.getDescription()}
    Color: ${circle2.getColor()}
    
    Circle 3:
    Area: ${circle3.getArea()};
    Circumference: ${circle3.getCircumference()}
    Description: ${circle3.getDescription()}
    Color: ${circle3.getColor()}
  
  ''');
}

const double PI = 3.14;

class Circle {
  double? radius;
  String? color;

  Circle()
      : radius = 1,
        color = 'red';

  Circle.second(this.radius) : color = 'red';

  Circle.third({required this.radius, required this.color});

  double? getArea() {
    return PI * radius! * radius!;
  }

  double? getCircumference() {
    if (radius != null) {
      return 2 * PI * radius!;
    }
    return null;
  }

  String? getDescription() {
    return 'Radius: $radius Color: $color';
  }

  String getColor() {
    return 'Color: $color';
  }
}