static void Main(string[] args)
{
Interface1 i;
i = new rectangle();
i.draw();
i = new circle();
i.draw();
}
static void Main()
{
rectangle r = new rectangle();
circle c = new circle();
area a;
a = r;
Console.WriteLine("\n ---------------------Program for interface--------------------------");
Console.WriteLine("\nArea of rectangle is " + a.compute(10, 20));
a = c;
Console.WriteLine("\nArea of circle is " + a.compute(10, 0));
Console.WriteLine("\n ---------------------End of Program--------------------------");
Console.ReadLine();
}