Object-Oriented Programming: Inheritance Concepts
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Questions and Answers

What is Inheritance?

Declares a new class by extending an existing class.

What is a Derived Class?

A class that inherits from or extends a base class.

What is a Base Class?

A class inherited by a subclass.

What is a Parent Class?

<p>Serves as a base for defining a derived class and is the same as a base class.</p> Signup and view all the answers

What is Superclass?

<p>Superclass refers to base class.</p> Signup and view all the answers

What is a Child Class?

<p>A derived class from a base class.</p> Signup and view all the answers

What is Subclass?

<p>Subclass refers to derived class.</p> Signup and view all the answers

A derived class is a subset of a base class.

<p>False</p> Signup and view all the answers

Can a class be derived from multiple base classes in C++?

<p>True</p> Signup and view all the answers

Identify the issues in the given class definitions.

<ol> <li>Must use this-&gt;radius instead of radius. 2. Missing public inheritance in 'class B: public Circle'. 3. Must use super(radius) for Circle initialization. 4. Must use Circle::getArea() instead of getArea().</li> </ol> Signup and view all the answers

What relationship is appropriate for Company and Employee?

<p>Composition</p> Signup and view all the answers

What relationship is appropriate for Course and Faculty?

<p>Composition</p> Signup and view all the answers

What relationship is appropriate for Student and Person?

<p>Inheritance</p> Signup and view all the answers

What relationship is appropriate for House and Window?

<p>Composition</p> Signup and view all the answers

What relationship is appropriate for Account and Savings Account?

<p>Inheritance</p> Signup and view all the answers

Define a derived class SavingsAccount from BankAccount.

<p>class SavingsAccount : public BankAccount { private: double interestRate; int interestType; public: SavingsAccount(double, string); double getInterestRate() const; int getInterestType() const; };</p> Signup and view all the answers

Define a derived class WindowWithBorder from Window.

<p>class WindowWithBorder : public Window { public: WindowWithBorder(int); int getUseableWidth(); private: int borderWidth; };</p> Signup and view all the answers

Define a derived class CameraPhone from Phone.

<p>class CameraPhone : public Phone { private: int imageSize; int memorySize; };</p> Signup and view all the answers

Study Notes

Inheritance Concepts

  • Inheritance is a fundamental concept in object-oriented programming, allowing a new class to extend the functionality of an existing class.
  • A derived class is one that inherits from a base class, enabling code reuse and the establishment of a hierarchy.
  • The base class, or parent class, is the class that is inherited from, serving as a foundation for derived classes.

Class Relationships

  • A superclass is synonymous with a base class; both are terms for the class from which other classes are derived.
  • A child class is another term for a derived class, emphasizing its relationship to the base class.
  • Subclass also refers to a derived class, which inherits attributes and behaviors from its parent class.

Important Notes on Derived Classes

  • A derived class extends a base class, rather than being a subset; it usually incorporates more detailed functionality and properties.
  • C++ supports multiple inheritance, allowing a class to be derived from more than one base class.

Error Identification in Class Definitions

  • When using member variables, it’s crucial to qualify with this-> to avoid ambiguity: this->radius = radius.
  • Inheritance must specify the access level, such as public, when extending a class.
  • To invoke a base class constructor, use an initialization list: Circle(radius);.
  • Properly qualify methods from the base class in the derived class such as Circle::getArea().

Relationship Types in UML

  • Compose relationships indicate that one class contains or is composed of another class (e.g., Company and Employee).
  • Inheritance relationships illustrate a hierarchy where one class derives from another (e.g., Account and Savings Account).

Derived Class Examples

  • SavingsAccount Class: Inherits from BankAccount, contains interestRate (double) and interestType (int) where type indicates simple (1) or compound (2) interest.
  • WindowWithBorder Class: Inherits from Window, adds borderWidth, and implements getUseableWidth() to calculate the width minus border size.

Additional Class Definitions

  • CameraPhone Class: To be designed with attributes imageSize (int) and memorySize (int), demonstrating data encapsulation and a constructor to initialize values.

Summary of Constructors and Functions

  • Constructors are special methods used to initialize new objects of derived classes.
  • Getter functions like getInterestRate() and getInterestType() provide controlled access to the private member variables, maintaining encapsulation principles.

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Description

This quiz explores the key concepts of inheritance in object-oriented programming. Understand the relationships between base classes, derived classes, superclasses, and child classes. Test your knowledge on how inheritance facilitates code reuse and class hierarchy development.

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