static void Main()
{
ImplementationClass obj = new ImplementationClass();
ITestInterface2 i = obj;//i is a parent refernce created by using a child instance
obj.Add(1, 2);
obj.Sub(6, 3);
i.Add(2, 2);//we can create a refernce and call it through it
i.Sub(10, 6);
Console.ReadLine();
}
//public void Sub(int a, int b) // mandatory to write public here
//{
// Console.WriteLine(a - b);
//}
static void Main(string[] args)
{
ImplementationClass obj = new ImplementationClass();
//obj.Add(10, 5);
//obj.Sub(10, 5);
ITestInterface2 i = obj; // we can create reference of obj
i.Add(10, 5);
i.Sub(10, 5);
Console.Read();
}
static void Main()
{
ImplementationClass obj = new ImplementationClass();
obj.Add(100, 11);
obj.Sub(100, 11);
ITestInterface2 i = obj;
i.Add(100, 11);
i.Sub(100, 11);
Console.ReadKey();
}