C++ Inheritance

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Questions and Answers

Which keyword is used to establish an inheritance relationship between classes in C++?

`inherits`
`derives`
`public` (correct)
`extends`

Consider classes `Vehicle` and `Car`. Which inheritance declaration correctly represents that `Car` inherits publicly from `Vehicle` in C++?

class Car : public Vehicle {} (correct)
class Car : Vehicle {}
class Car : protected Vehicle {}
class Car : private Vehicle {}

What type of relationship is best described by inheritance?

Is-a (correct)
Has-a
Part-of
Uses-a

If class `Dog` inherits publicly from class `Animal`, what is a direct consequence?

<code>Dog</code> can access <code>Animal</code>'s protected and public members. (D)

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Which of the following is true about the `eat()` function in the provided code?

Objects of both the <code>Animal</code> and <code>Dog</code> classes can call the <code>eat()</code> function. (B)

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In the context of inheritance, what does it mean for a class to 'inherit' from another?

The class gains access to the public and protected members of the other class, but not the private members. (A)

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Which of the following real-world scenarios best exemplifies an 'is-a' relationship suitable for inheritance?

A rose is a flower. (C)

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If a base class `Shape` has a protected member variable `area`, how is this variable's accessibility affected in a derived class `Rectangle` that inherits publicly from `Shape`?

<code>area</code> is protected in <code>Rectangle</code>. (D)

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Consider a base class `Animal` with a private member `name`. If `Dog` inherits from `Animal`, how can you access or modify `name` from within `Dog`?

Private members of base classes cannot be accessed in Drive class (A)

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Why is it important to determine whether an 'is-a' relationship exists before implementing inheritance between two classes?

To correctly model the relationship between classes and avoid logical errors. (A)

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Flashcards

Inheritance

A key feature in C++ that allows creating a new class (derived class) from an existing class (base class), inheriting features and adding new ones.

Is-a Relationship

A relationship where one class is a specialized version of another class. It ensures that the derived class is a subtype of the base class.

Derived Class

A class that inherits properties and behaviors from another class. It can extend or modify the inherited features.

Base Class

An existing class that provides the base for inheritance. It contains common properties and behaviors that are inherited by derived classes.

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Study Notes

Inheritance lets programmers create new classes (derived class) from existing classes (base class).
The derived class inherits features from the base class and can have additional features.
class Dog : public Animal shows the Dog class inheriting from the Animal class.
Members of Animal are accessible to Dog.
public is a keyword used while inheriting Dog from Animal.
private and protected can also be used instead of public.
Inheritance represents an is-a relationship between classes.
Inheritance is used when an is-a relationship exists between two classes.
Examples of is-a relationships include:
- A car is a vehicle.
- Orange is a fruit.
- A surgeon is a doctor.
- A dog is an animal.

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Questions and Answers

Which keyword is used to establish an inheritance relationship between classes in C++?

Consider classes `Vehicle` and `Car`. Which inheritance declaration correctly represents that `Car` inherits publicly from `Vehicle` in C++?

What type of relationship is best described by inheritance?

If class `Dog` inherits publicly from class `Animal`, what is a direct consequence?

Which of the following is true about the `eat()` function in the provided code?

In the context of inheritance, what does it mean for a class to 'inherit' from another?

Which of the following real-world scenarios best exemplifies an 'is-a' relationship suitable for inheritance?

If a base class `Shape` has a protected member variable `area`, how is this variable's accessibility affected in a derived class `Rectangle` that inherits publicly from `Shape`?

Consider a base class `Animal` with a private member `name`. If `Dog` inherits from `Animal`, how can you access or modify `name` from within `Dog`?

Why is it important to determine whether an 'is-a' relationship exists before implementing inheritance between two classes?