static void Main(string[] args)
{
// Perform an "Add" operation
AddOperation add = new AddOperation(10, 20);
Console.WriteLine(add.Calculate());
// TODO: perform a "Multiply" operation
}
static void Main(string[] args)
{
// Perform an "Add" operation
AddOperation add = new AddOperation(5, 16);
Console.WriteLine(add.Calculate());
// TODO: perform a "Multiply" operation (create MultiplyOperation class)
MultiplyOperation multiply = new MultiplyOperation(5, 16);
Console.WriteLine(multiply.Calculate());
Console.ReadLine();
}