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Hint: Define the start() method in both the base and derived classes.
Question: Define a class Animal with a method speak() that prints "Animal speaks". Then, create two subclasses Dog and Cat, each overriding the speak() method to print "Bark" and "Meow" respectively.
Hint: Override the speak() method in both subclasses.
Question: Write a class Shape with a method area() that returns 0. Create subclasses Rectangle and Circle, overriding the area() method to calculate and return the area of the shape.
Hint: Use the appropriate formulas for the area of a rectangle and a circle in the subclass methods.
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