CPP Object-Oriented Programming & Class Design 2

Question 1

Which access specifier should be used for data members that must be accessible only within the class and its derived classes?

Accepted Answer

protected

Answer

Protected members are accessible within the class itself and by derived classes, but not from outside the class hierarchy.

Question 2

What is the purpose of a copy constructor in C++?

Accepted Answer

To initialize an object as a copy of another object of the same type

Answer

A copy constructor initializes a new object by copying the state from an existing object of the same type.

Question 3

In C++, what does the 'explicit' keyword prevent when applied to a constructor?

Accepted Answer

Implicit type conversions using that constructor

Answer

The explicit keyword prevents the compiler from using a constructor for implicit conversions or copy-initialization.

Question 4

What is object slicing in C++?

Accepted Answer

Losing derived-class data when a derived object is assigned to a base-class object by value

Answer

Object slicing occurs when a derived class object is copied into a base class object by value, stripping away the derived portion.

Question 5

Which of the following correctly declares a pure virtual function in C++?

Accepted Answer

virtual void draw() = 0;

Answer

A pure virtual function is declared with 'virtual' and assigned '= 0', making the class abstract.

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