//Write a program to create an abstract class find Rectangle class area.
using System;
abstract class abs
{
    public abstract void area(Double l,Double w);
}
class getdata : abs
{
    public override void area(Double l, Double w)
    {
        double area;
        area = l * w;
        Console.WriteLine("Rectangle area is : {0} ",area);

    }
}

class myclass
{
    public static void Main()
    {
        Double l, w;
        Console.WriteLine("enter length");
        l = Convert.ToDouble(Console.ReadLine());
        Console.WriteLine("enter width");
        w= Convert.ToDouble(Console.ReadLine());
        getdata d = new getdata();
        d.area(l, w);
        Console.Read();
    }
}