Inheritance in C++ - Reading Assignment

C++ Programming
#142

Nice touch! I liked it! :wink:
Ivo

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#143

1.1. Why do we need inheritance in C++?
It allows child classes to reuse member functions of their parent class, thus saving work and also child classes gets automatically updated when modifying a their parent class.

1.2. Give a simple example of objects in the real world that could be modeled in C++ using inheritance.
Animals<-Domesticated animals<-Pets<-Dogs

2.1. What is a superclass and what is a subclass?
A subclass is a class within a class, refered to as superclass.
A class being inherited from is called the “parent class”, “base class” , or “superclass”.
A class doing the inheriting is called the “child class” , "“derived class” , or “subclass”.

2.2. How would you write a public inheritance in C++?
I would define the child class in the “public:” section of the parent class with all the public variable and member functions.

2.3. In what ways can a subclass extend the functionality of a superclass?
By creating more variables, functions and even classes in addition to the ones inherited.

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#144

Introduction to inheritance

  1. Why do we need inheritance in C++?

Inheritance in C++ lets us construct complex classes through defining hierarchical relationship between objects.

  1. Give a simple example of objects in the real world that could be modelled in C++ using inheritance.

Parrots and owls are types of birds and logic tells us that anything that is true of birds is also true of parrots and owls. All birds have weight, color, feathers, wings, beak…Therefore, parrots and owls also have weight, color, feathers, wings and beak. We can say that parrots and owls inherit these all of the properties of birds because they are birds.

Basic inheritance in C++

  1. What is a superclass and what is a subclass?

The class being inherited from is called the parent class, base class, or superclass, and the class doing the inheriting is called the child class, derived class, or subclass.

  1. How would you write a public inheritance in C++?

To write public inheritance we would, after the subclass declaration, use a colon, the word “public”, and the name of the class we wish to inherit.

class subclassX : public superclassX
{
// subclass properties and methods
};
  1. In what ways can a subclass extend the functionality of a superclass?

When inheriting properties and methods from a superclass we automatically receive the member functions and member variables of the superclass through inheritance. Then we can simply add the additional functions or member variables we want by defining them in the subclass. In this way we are extending functionalities of a superclass.

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#145

First section:

  1. In general, inheritance is used when a class should get attributes (properties) and methods from another class (the base class). You can think about this as a modelling of the relation ship between the classes. When you want to derive a new class which should have the same existing attributes and methods as the base class you should use inheritance. Then the new classes can automatically work with the derived properties and methods. That being said, you can reuse existing code which also make the code easier to maintain.

  2. Just image the base class vehicle with methods like accelerating and breaking. Now you can derive new classes out of it (like car, bus etc.) which are also vehicle and now can use the methods accelerating and breaking. You don´t have to rewrite the whole code, instead you can reuse the code.

Second section:

  1. A superclass should have all attributes and methods which the derived classes also should have. A subclass inherits all properties/attributes and methods from the superclass. Inside the subclass we can use all methods and properties from the superclass.

  2. Imagine Person is the superclass and Footballplayer is the subclass (because every football player is a person (inheritance is modelling a is a relationship), then you write
    class Footballplayer: public Person{... }

  3. You can override the base methods in the subclass or add some new methods/properties to the subclass.

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#146

Why do we need inheritance in C++?
Inheritance allows us to reuse classes by having other classes inherit their members. In future lessons, we’ll continue to explore how this works.

Inheriting from a base class means we don’t have to redefine the information from the base class in our derived classes

Give a simple example of objects in the real world that could be modelled in C++ using inheritance.
1. cryptocurrencies
BTC
ETH
XMR
LTC
DGB

what is a superclass and what is a subclass?
A superclass is the parent class we could have currency as super class and then cryptocurrencies and fiat as the child class. Cryptocurrency could also be a parent class to ex BTC. that mean a class can both be a parent and a child except the superclass its the granddaddy.

How would you write a public inheritance in C++?
public cryptoCurrencies{}

In what ways can a subclass extend the functionality of a superclass?
The subclass can add new variables and methods and overwrite the already exciting variables. that means we now can ad new members and methods. ex soon we gonna ad Bidao to the cryptocurrency parent class.

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#147

First article

  1. To provide an alternative to object composition in constructing complex classes. It enables to model an “is-a” relationship between two objects, rather than a “has-a” relationship similar to the one object composition allows.
  2. Whenever there is inheritance of some traits in real life, for example when modelling genetic features transfer, common features among different models of the same device or other similar items showing similar characteristics.

Second article

  1. The parent class, so the one being inherited.
  2. class “class name” : public “public keyword”{
    public:
    //code
    }
  3. The subclass will have access to all functionalities built within the parent, but it will also be able to build new ones or override them.
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#148

1. Why do we need inheritance in C++?
The allows objects to inheret attributes of previous classes and reduces the amount of code required to define new objects.

2. Give a simple example of objects in the real world that could be modelled in C++ using inheritance.
Different types of fruit, animals or plants could be modelled using inheritance.

*1. What is a superclass and what is a subclass?
Superclass and subclass refer to the inheritance order of the class. A subclass inherits from a superclass.

2. How would you write a public inheritance in C++?
Write “: public inheriting class” after the new class declaration.

3. In what ways can a subclass extend the functionality of a superclass?
Because the subclass inherits all the variables and functions of the superclass it retains these attributes. The subclass can extend these functionalities by adding new specific functions and variables only associated with the new subclass.

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#149

PART 1

  1. We need inheritance because it allows writing new classes that need the same attributes and behaviors much faster. Also, it is easier to make the update the base class whenever we need to and this change will be reflected in inherited classes as well.
  2. The vehicle could be used as an example. Cars and motors could be inherited from it.

PART 2

  1. The superclass is the class that is being inherited, while the subclass is the class that is doing the inheriting.
class Car : public Vehicle {
 ....
};
  1. In the subclass, we can define new variables and functions while inheriting all existing variables and functions from the superclass. We can also override inherited functions.
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#150

Part I

  1. We need inheritance because it allows us to create new objects by directly acquiring attributes and behaviors of other objects and the extending or specializing them.

  2. A simple example would be different types of car engines, they are all car engines but engineered in different ways and have different attributes.

Part II

  1. Superclass is the class that is being inherited, and subclass is the class doing the inheriting.

  2. class SubClass: public SuperClass{};

  3. The subclass can have new methods and variables that can override the existing ones.

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#151

1.) Inheritance helps optimize coding by having objects inherit properties of a similar type.

2.) Color —> blue ----> Navy blue

1.) The class donating some of it’s properties to a sub class under it.

2.) class English: public Language
{ Public:
// specialized members or variables here.
}

  1. By retaining all of the parenting classes properties and methods while adding a few special ones in a new subclass without changing those in the parent class.
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#152

part1

  1. It allows us an “is-a” relationship. this assists with codes reuse and maintainable
  2. iphone < iphone3g < iphone 4 < iphone 5 so and so

part2

  1. superclass - parent
    subclass - child
    subclass inherits the properties and behaviors of the superclass
  2. class iphone : public Phone {};
  3. The subclass is able to add new methods and new variables to the inherited properties and behaviors of the superclass as well as change existing ones
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#153

1. Why do we need inheritance in C++? Inheritance allows us to create objects that inherit properties of other objects, which reduces the amount of code required to define new objects.

2. Give a simple example of objects in the real world that could be modeled in C++ using inheritance.

  • Invention
  • Machine
  • Vehicle
  • Truck
  • Ford Raptor
  • Ford Raptor SuperCrew
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#154
1. Why do we need inheritance in C++?

Inheritance allows you to model a hierarchy where children inherit all the functionality of their parents then add something new. This enables a higher level of code reuse and abstraction.

2. Give a simple example of objects in the real world that could be modeled in C++ using inheritance.
  • Base class: Animal
  • Derived classes: Dog, Bird, Snake
    All dogs are animals, but not all animals are dogs. All animals can move but they move in different ways- a dog runs, a bird flies, and snakes slither. Dogs have tails, birds have tails too but also wings. All of these things can be modeled more inefficiently using inheritance than creating 3 separate classes for Dog, Bird, Snake.

Part 2

1. What is a superclass and what is a subclass?
  • Superclass: the class which is inherited from
  • Subclass: the class which receives the inheritance of the superclass- both methods and variables (except private ones)
2. How would you write a public inheritance in C++? 
class Subclass: public SuperClass {
}
  • It should also be noted that the constructor of the Superclass is executed first then then the constructor of the Subclass (discussed in the next section of the article)
3. In what ways can a subclass extend the functionality of a superclass?

Adding additional variables and functions

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#155

1. Why do we need inheritance in C++? Inheritance allows us to create objects that inherit properties of other objects, which reduces the amount of code required to define new objects.

2. Give a simple example of objects in the real world that could be modeled in C++ using inheritance.

  • Invention
  • Machine
  • Vehicle
  • Truck
  • Ford Raptor
  • Ford Raptor SuperCrew

1. What is a superclass and what is a subclass? In an inheritance (is-a) relationship, the class being inherited from is called the parent class, base class, or superclass, and the class doing the inheriting is called the child class, derived class, or subclass.

2. How would you write a public inheritance in C++? class ChildClass : public ParentClass { /*Class elements*/ };

3. In what ways can a subclass extend the functionality of a superclass? By defining its own member variables and member functions.

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#156

1)Why do we need inheritance in C++?
It allows programmers to create new objects by directly and acquiring the attributes and behaviors of other objects.

2)Give a simple example of objects in the real world that could be modelled in C++ using inheritance.
Shapes, for examples, squares inheriting properties from rectangles which inherit properties from quadrilaterals which is part of the class of shapes

3)What is a superclass and what is a subclass?
Superclass is the parent class from which attributes are inherited, and the sublcass is the child class that inherits attributes

4)How would you write a public inheritance in C++?
class child class : public parent class

5)In what ways can a subclass extend the functionality of a superclass?
functionality can be extended on a sublcass basis

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#157

Why do we need inheritance in C++?
To create objects that inherits properties from another object. It creates a “has-a” relationship between two objects.
Give a simple example of objects in the real world that could be modelled in C++ using inheritance.
Iphone = Iphone4 < Iphone5 < Iphone6, for exaple.

What is a superclass and what is a subclass?
A superclass is the class being inherited from. And a subclass is the class doing the inheriting.
How would you write a public inheritance in C++?
class Phone: public Iphone4{ };
In what ways can a subclass extend the functionality of a superclass?
It can for example add new variables,add new methods.

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#158

  1. Inheritance provides an easy way to classify data where many different data points will share many characteristics.

  2. In the animal kingdom you have many classifications, families, species, etc. Dogs and cats will share many properties despite being different species, and their shared properties can be ‘inherited’ for ease of use.

  3. Superclasses are those from which data is derived, subclasses derive data from superclasses.

  4. Declare a superclass, then declare the subclass as a version of superclass.

  5. The subclass will always be a variant of the superclass and in addition will provide properties specific to the subclass only.

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#159
  1. It is a good way to get properties from other objects - saves time.
  2. Homo-sapiens & neanderthals.
  1. Superclass: a parent class, while subclass is a child class that inherits properties from superclass.
  2. class Mom : public Family {…}
  3. Through inheritance… it gets all the propertires of its parent.
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#160

1. Why do we need inheritance in C++?
Inheritance allows us to reuse classes and construct new ones and also provides intuition and easy maintenance.
Give a simple example of objects in the real world that could be modelled in C++ using inheritance.
Cars and planes inherit engine.

1. What is a superclass and what is a subclass?
A superclass means the class is inherited and a subclass is doing the inheriting which add different variables and functions.
2. How would you write a public inheritance in C++?
class Car : public engine {
…
};
3. In what ways can a subclass extend the functionality of a superclass?
By adding new variables and functions.

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#161

Answer:

    1. We need inheritance to categorize similar objects that have similar properties. In C++, it allows us to acquire attributes and behaviors from the other objects. Then we can use them to specialize our newly created object.
    1. Books -> Categories -> Subcategories
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