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what is the need of abstraction? what is abstraction?what
is the abstraction for stack?
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Answer Posted / mms zubeir
As I answered one of the questions here, the abstraction is
nothing but declaration of a concept in software terms
which does not exist in real-world.
For example, mango, drumstick, brinjal, potato are all
vegetables. But "Vegetable" is just a concept and it has no
real-world existance.
To represent these kind of concept in software terms, we
need abstration.
On the other hand, the mango, brinjal, ... are all have
concrete implementations since they have certain properties
and can do some operations on them in the real world.
I couldn't get the third question "abstraction for stack",
but I try to answer with what I understood.
Normally, stack's operations include push, pop, top, size,
empty e.t.c. If we define an interface with these, it ll be
an abstraction for stack. Let me know if it doesn't answer
your question.
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What is the purpose of polymorphism?
They started with the brief introduction followed by few basic C++ questions on polumorphism, inheritance and then virtual functions. What is polymorphims? How you will access polymorphic functions in C? How virtual function mechanism works?
Question In a class, there is a reference or pointer of an object of another class embedded, and the memory is either allocated or assigned to the new object created for this class. In the constructor, parameters are passed to initialize the data members and the embedded object reference to get inialized. What measures or design change should be advised for proper destruction and avioding memory leaks, getting pointers dangling for the embedded object memory allocation? Please suggest. Question Submitted By :: Sunil Kumar I also faced this Question!! Rank Answer Posted By Re: In a class, there is a reference or pointer of an object of another class embedded, and the memory is either allocated or assigned to the new object created for this class. In the constructor, parameters are passed to initialize the data members and the embedded object reference to get inialized. What measures or design change should be advised for proper destruction and avioding memory leaks, getting pointers dangling for the embedded object memory allocation? Please suggest. Answer # 1 use copy constructors 0 Shanthila There is something to be taken care in destructor, in copy constructor, suppose the memory is assigned to the embedded member object pointer with the parameter passed value, but if some other objects of different class also are pointing to this memory, then if some one deletes the object then this class member pointer object will become dangling, or if the object is not deleted properly then there will be memory leak. Please suggest the design change required to handle or avoid this situation
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