Question

You are c# developer who is developing a windows application. you need to provide derived classes the ability to share common functionality with base classes but still define their own unique behavior. which object-oriented programming concept should you use to accomplish this functionality?

Answer 1

Polymorphism; the concept of one definition, but multiple implementations.
In C#, this is done using the 'abstract' and 'override' keywords.
Example:

abstract class Shape {
public abstract double area();
}

class Square : Shape {
private double size;

public Square(double size = 0) {
this.size = size;
}

public override double area() {
return size * size;
}
}