update

dart_ex_1/main.dart

@@ -1,96 +0,0 @@
-/* --------------------------------------------- 100 -------------------------------------------- */
-
-import 'dart:io';
-
-// void main() {
-  
-//   print("please enter your age");
-//   String? _age = stdin.readLineSync();
-//   int age = int.parse(_age!);
-//   int turn100 = 100 - age;
-//   print("your age is $turn100");
-//   if (age%2 > 0) {
-//     print("your age is odd");
-//   }
-//   else if (age%2 == 0) {
-//     print("your age is even");
-//   } 
-// }
-
-abstract class Component {
-  final String id;
-  final double x;
-  final double y;
-  final String themeColor;
-  final bool isVisible;
-
-  // The base constructor sets the foundation
-  Component({
-    required this.id,
-    required this.x,
-    required this.y,
-    this.themeColor = 'blue', // Default value
-    this.isVisible = true,    // Default value
-  });
-
-  void render();
-}
-
-
-class Button extends Component {
-  final String label;
-  final double width;
-  final double height;
-
-  Button({
-    // --- Unique to Button ---
-    required this.label,
-    required this.width,
-    required this.height,
-
-    // --- Passed to Component via super. ---
-    required super.id,
-    required super.x,
-    required super.y,
-    super.themeColor,  // Doesn't require coz if user not define it defaults to parent's 'blue'. But if user provide value, use super to assign provided value to parent class variable. 
-    super.isVisible,  // Doesn't require coz if user not define, it defaults to parent's 'true'
-
-
-    // "assert" is a "sanity check" that runs before the class is even fully created. It ensures you can't accidentally create an invisible button with a width of -50. If the condition fails, the program crashes (in debug mode) with your custom error message.
-  }) : assert(width > 0 && height > 0, 'Dimensions must be positive'); 
-
-  @override
-  void render() {
-    print('Rendering Button "$label" at ($x, $y) with color $themeColor');
-  }
-}
-
-
-void main() {
-  final loginBtn = Button(
-    label: 'Login',
-    width: 200,
-    height: 50,
-    id: 'btn_001',
-    x: 100,
-    y: 500,
-    themeColor: 'green', // Overriding the default
-  );
-
-  loginBtn.render();
-}
-
-// ------------------------------------------------------------------
-
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