Object Oriented Programming interview questions part 52
Object Oriented Programming interview questions part 52
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Total Questions: 20
1. Which keyword is used to define the inline member function?
Correct Answer is : inline
2. What is upcasting?
Correct Answer is : Casting subtype to supertype
3. Which among the following is true for upcasting in inheritance?
Correct Answer is : Upward to the inheritance tree
4. Which among the following is safe?
Correct Answer is : Upcasting
5. Which among the following is best situation to use upcasting?
Correct Answer is : For general code dealing with only supertype
6. Which property is shown most when upcasting is used?
Correct Answer is : Complex code simple syntax
7. Upcasting and downcasting objects is same as casting primitive types.
Correct Answer is : FALSE
8. Which casting among the following is allowed for the code given below? class A { public :int a; } class B:public A { int b; } main() { B b=new A(); //casting 1 A a=new B(); //casting 2 }
Correct Answer is : Casting 2
9. If multiple inheritance is implemented, which upcasting will be correct?
Correct Answer is : Upcast to any base class
10. If class C inherits class B and class B inherits class A ________________
Correct Answer is : Class C object can be upcasted to object of either class A or B
11. Upcasting is _____________________ without an explicit type cast.
Correct Answer is : Always allowed for public inheritance
12. Which concept is needed because of implicit type casting use?
Correct Answer is : Dynamic binding
13. When are the pointer types known for upcasting the objects?
Correct Answer is : Compile time
14. When are the object type known for upcasting the objects?
Correct Answer is : Runtime
15. If two classes are defined “Parent” and “Child” then which is the correct type upcast syntax in C++?
Correct Answer is : Parent *p=&child;
16. Which among the following is true?
Correct Answer is : Upcasting is possible for any type of inheritance
17. Virtual function is ______ class function which expected to be redefined in ______ class, so that when reference is made to derived class object using pointer then we can call virtual function to execute ________ class definition version.
Correct Answer is : Base, derived, derived
18. What does a virtual function ensure for an object, among the following?
Correct Answer is : Correct method is called, regardless of the type of reference used for function call
19. Virtual functions are mainly used to achieve _____________
Correct Answer is : Runtime polymorphism
20. Which keyword is used to declare virtual functions?
Correct Answer is : virtual
