stack unwinding

respected sir
i have know the concepts perhaps but some doubts which i want to clear so plz tell me
1.what is concrete classeses?
2.what is Stack unwinding?
i will be thankfull to u

from
deepak kr

[Valmont]

1) A concrete class is a class that implements an abstract class.
2) Stack unwinding is the process of freestore management during exception handling. Especially memory clean up.

For further study:
1) Learn the ways of abstract classes, inherritance, pure virtual functions and polymorphism.
2) Learn the ways of exception handling. Then learn to throw an exception without trashing the memory.

[Valmont]

Almost all of the queries you sent so far are quite easely to find on Google. For you the same rules apply: I want to see some effort before I do my best.
This is the last time. I don't want students to think they have less rights then those claim to be an IT teacher.

Locked, and don't start a new thread without showing serious efforts first.