A dual interface allows its methods to be accessed as dispinterface methods or as vtable methods.
Dual interface is one that supports both - IDispatch interface and vtbl-based interface. Therefore, it might be used in scripting environment like VBScript and yet to use power and speed of vtbl-based interface for non-scripting environment.
Can you please explain the order in which constructors are called when an object of a derived class is created?
Which of the following statement is correct about constructors? A. A constructor has a return type. B. A constructor cannot contain a function call. C. A constructor has no return type. D. A constructor has a void return type.
To ensure that every object in the array receives a destructor call, always delete memory allocated as an array with operator __________ . A. destructor B. delete C. delete[] D. kill[] E. free[]
Which of the following gets called when an object is being created? A. constructor B. virtual function C. destructor D. main
Which of the following statement is correct whenever an object goes out of scope? A. The default constructor of the object is called. B. The parameterized destructor is called. C. The default destructor of the object is called. D. None of the above.
Can a class have virtual destructor? A. Yes B. No
What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor? A. Compile-time error. B. Preprocessing error. C. Runtime error. D. Runtime exception.
A constructor that accepts __________ parameters is called the default constructor. A. one B. two C. no D. three
Destructor has the same name as the constructor and it is preceded by ______ . A. ! B. ? C. ~ D. $
Which of the following statement is correct? A. A constructor of a derived class can access any public and protected member of the base class. B. Constructor cannot be inherited but the derived class can call them. C. A constructor of a derived class cannot access any public and protected member of the base class. D. Both A and B.
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