Inheritance Concepts in Object-Oriented Programming

Questions and Answers

What is another name for a child class?

Derived class

Descendent class

Sub class

All of the above (correct)

None of the above

A base class may have at most ________ child class derived from it.

Any number (correct)

Which is the correct way to tell the compiler that the class being declared (ChildClass) is derived from the base class (BaseClass)?

class ChildClass:public BaseClass (correct)

class ChildClass derived BaseClass

class ChildClass childOf public BaseClass

class ChildClass::public BaseClass

Another name for the base class is?

All of the above Signup and view all the answers

If you define a function in the derived class that has the same function signature as a function in the base class, this is known as?

Redefinition Signup and view all the answers

If the member variables in a base class are private, then?

The derived class must use any accessor or modifier functions from the base class. Signup and view all the answers

In the derived class definition, you list from the base class?

Only those member functions that need to be redefined. Signup and view all the answers

Given a base class with at least one public member function, how many classes can redefine that member function?

All of them Signup and view all the answers

If a base class has a public member function, and the derived class has a member function with the same name but with a different parameter list, this function is said to be?

Overloaded Signup and view all the answers

Using inheritance allows us to?

All of the above Signup and view all the answers

Which of the following are not true?

An object of the base class may be stored in a variable of the derived class. Signup and view all the answers

Which of the following are true?

None of the above Signup and view all the answers

If the member variables in the base class are listed as protected, then who can access or modify those variables?

All of the above Signup and view all the answers

If a base class has public member functions that are not listed by a derived class, then these functions?

Are inherited unchanged in the derived class. Signup and view all the answers

When deriving a class, you should?

List only base class functions that will be redefined. Signup and view all the answers

If a derived class (Class2) has redefined a function from the base class (Class1), how can that derived function call the base class function?

By using the syntax 'Class1::functionName()'. Signup and view all the answers

Study Notes

Inheritance Concepts in Object-Oriented Programming

A child class is also known as a derived class, descendent class, or sub class.
A base class can have any number of child classes derived from it.

Syntax for Class Declaration

The correct syntax for declaring a derived class in C++ is class ChildClass:public BaseClass.

Base Class Terminology

Alternate names for a base class include parent class, ancestor class, and super class.

Function Redefinition

Redefining a function in a derived class that matches the function signature of a base class is referred to as redefinition.

Accessing Private Variables

If member variables in a base class are private, the derived class can only access them through accessor or modifier functions from the base class.

Redefining Member Functions

When defining a derived class, only member functions from the base class that need to be redefined should be listed.

Member Function Redefinition Rules

Any derived class can redefine a public member function from the base class.

Function Overloading

If a derived class has a function with the same name as a public member function of the base class, but with a different parameter list, it is termed as overloaded.

Benefits of Inheritance

Inheritance enables the use of polymorphism, eliminates duplicate code, and enhances modularity in classes.

Object Storage and Class Variables

An object of the base class cannot be stored in a variable of the derived class, while an object of a derived class can be stored in a base class type variable.

Constructor Definitions

Constructors are not required to be defined in both the base and derived classes; base constructors are not inherited.

Protected Member Variables

Protected member variables in a base class can be accessed by friends and members of both the base and derived classes.

Member Function Inheritance

Public member functions from a base class that are not explicitly redefined in a derived class are inherited unchanged.

Redefining Functions on Derivation

When deriving a class, only list base class functions that will be redefined, instead of overloading all or listing all functions.

Calling Base Class Functions

A derived class function can call a base class function using the syntax Class1::print(); when the function name and signature are provided.

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Description

This quiz covers key concepts related to inheritance in object-oriented programming, focusing on terminologies such as base and derived classes. It includes syntax for class declaration in C++, accessing private variables, and function redefinition rules. Ideal for students interested in deepening their understanding of C++ inheritance.