Base Shape.Area() overridden in Circle.
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using System;
class Program
{
static void Main()
{
Shape s = new Circle(3);
Console.WriteLine(s.Area());
abstract class Shape { public abstract double Area(); }
class Circle : Shape {
double r; public Circle(double r) => this.r = r;
public override double Area() => Math.PI * r * r;
}
}
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Runtime polymorphism—virtual/override or abstract methods.
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