The idea is to use static member in the class to count objects. A static member is shared by all objects of the class, all static data is initialized to zero when the first object is created if no other initialization is present, And constructor and static member function can only access static data member, other static member functions and any other functions from outside the class.
We create a static int type variable and put this a static variable with an increment operator so that it increases by 1 in the constructor.
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