static void Main(string[] args)
{
Student obj = new Student(1, "sdsd", "2/23/2016", "pune");
Console.WriteLine("Details " + obj.getDetails());
Console.WriteLine("Age " + obj.getAge());
Employee obj1 = new Employee(1, "abc", 1200.5, "12/20/2018");
Console.WriteLine("Salary " + obj1.getSalary(42));
Console.WriteLine("Experiance " + obj1.getExperiance());
Product obj2 = new Product();
Console.WriteLine(obj2.getProduct());
Book obj3 = new Book(2, "Harry Potter", 200, "J K ROwling");
Console.WriteLine(obj3.getDetails());
Console.ReadKey();
Environment.Exit(1);
}