Hakeem110

class AnimalSound{
  void sound() => print('...');
}

class Cat extends AnimalSound{
  @override
  void sound() => print('Cat says: Meow');
}

class Cow extends AnimalSound{

Hakeem110

abstract class Employee{
  String name;
  Employee(this.name);
  double calculateSalary();
  void display() => print('$name earns: Rs ${calculateSalary()}');
}

class FullTimeEmployee extends Employee{
  double monthlySalary;
  FullTimeEmployee(String name, this.monthlySalary): super(name);

Hakeem110

class Vehicle{
  void start() => print('Vehicle started');
}

class CarV extends Vehicle{
  void drive() => print('Car is driving');
}

class ElectricCar extends CarV{
  void charge() => print('Electric car is charging');

Hakeem110

class Shape {
  void draw() => print('Drawing a shape');
}

class Circle extends Shape{
  @override
  void draw() => print('Drawing a Square');
}

class Square extends Shape{

Hakeem110

class Animal {
  void eat() => print('Animal is eating');
}

class Dog extends Animal {
  void bark() => print('Dog is barking');
}
void main(){
  Dog dog = Dog();
  dog.eat();

Hakeem110

class Rectangle {
  double length;
  double width;
  
  Rectangle (this.length, this.width);
  
  void area() => print('Area = ${length * width}');
  void perimeter() => print('Perimeter = ${2 * (length + width)}');
}

Hakeem110

class BankAccount {
  double balance = 0;
  
  void deposit(double amount){
    if (amount > 0){
      balance += amount;
      print('Deposited: \Rs $amount');
    }
  }
    

Hakeem110

class Car{
  String brand;
  int year;
  
  Car()
    : brand = 'Audi', year = 2020;
  
  Car.withDetails(this.brand, this.year);
  
  void display() {

Hakeem110

class Student {
  String name;
  int id;
  String course;

  Student(this.name, this.id, this.course);

  void printInfo() {
    print('Student: Name = $name, ID = $id, Course = $course');
  }

Hakeem110

// Qustinon 01
class Person {
  String name;
  int age;
  Person(this.name, this.age);
  void display() {
    print('Person: Name = $name, Age = $age');
  }
}