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2. struct and class are same except that struct has a member as public by default while class has a member as private by default.

in c++ it can. public by default (struct) private by default (class) only difference

Reference: has to be initialized when declared
cannot reseat once refer to an object
cannot do arithmetic operation, int& ref=&a, ref++ will be wrong
cannot be assigned with NULL
cannot take the reference of a reference variable, pointter of pointer is possible
As a general rule,
Use references in function parameters and return types to define attractive interfaces.
Use pointers to implement algorithms and data structures.

1. pointer could be NULL while reference must be alias for some object; pointer can be reassigned to point to other objects, while reference must always be the alias for the same object.

2. struct has no member function? not sure tho

3. new and delete. new calls constructors while malloc does not

agree, I was wrong

inheritance in struct is public by default and in class its private by defualt

In case of C#, Structures and Classes are different because structures are allocated on stack and class objects are allocated on heap. Structures does not support inheritance, as they're implicitly sealed. Furthermore, no member function of a Structure can be virtual, also destructors and finalize methods cannot be written for structures.

the only difference between C++ struct and class is that the default data type in class is private whereas its public in case of struct, apart from that rest of the things are same in C++. this is _the only_ difference...

A reference is essentially a pointer that has already been de-referenced for you.

reference is a syntactic sugar when compared to a pointer

struct can't have functions like a class