CPP Object-Oriented Programming & Class Design 3

Question 1

Which rule of thumb states that if a class defines a destructor, copy constructor, or copy assignment operator, it likely needs all three?

Accepted Answer

Rule of Three

Answer

The Rule of Three states that if you explicitly define any of the destructor, copy constructor, or copy assignment operator, you should define all three.

Question 2

What is the effect of declaring a member function 'const' at the end of its declaration?

Accepted Answer

It guarantees the function will not modify the object's state

Answer

A const member function promises not to modify the object it is called on, allowing it to be called on const objects.

Question 3

In C++ inheritance, what is the order of constructor calls when a Derived class inherits from Base?

Accepted Answer

Base constructor first, then Derived constructor

Answer

Base class constructors always run before the derived class constructor to ensure the base subobject is fully initialized first.

Question 4

What is the difference between method overloading and method overriding in C++?

Accepted Answer

Overloading defines multiple functions with the same name but different signatures in the same scope; overriding redefines a virtual base function in a derived class

Answer

Overloading creates multiple functions with the same name but different parameters, while overriding provides a new implementation of a virtual function in a subclass.

Question 5

What does the 'override' specifier in C++11 do when applied to a virtual function in a derived class?

Accepted Answer

It causes a compile-time error if the function does not actually override a base virtual function

Answer

The override specifier tells the compiler to verify that the function actually overrides a base class virtual function, catching signature mismatches at compile time.

(CPP) C++ Programming Professional Certificate Practice Test

(CPP) C++ Programming Professional Certificate Practice Test

CPP Object-Oriented Programming & Class Design 3