CPP OOP Quiz

What is object-oriented programming (OOP)?

• Object-oriented programming (OOP) is a programming paradigm based on the concept of functions, which can contain data in the form of fields and code in the form of procedures.

• Object-oriented programming (OOP) is a programming paradigm based on the concept of objects, which can contain data in the form of fields (attributes or properties) and code in the form of procedures (methods or functions). It allows for the organization of code into reusable and modular structures.

• Object-oriented programming (OOP) is a programming paradigm that focuses on linear code execution without the use of objects.

• Object-oriented programming (OOP) is a programming paradigm that only allows for procedural programming without the use of objects.

What are the four pillars of OOP?

• abstraction

• inheritance

• encapsulation, inheritance, polymorphism, abstraction

• overloading

• encapsulation

Explain the concept of classes and objects in OOP.

• Objects are blueprints for creating classes in OOP, while classes are instances of objects.

• Classes are used to define functions in OOP, while objects are variables that store data.

• Classes and objects are interchangeable terms in OOP, both referring to the same concept.

• Classes in OOP are templates for creating objects, while objects are instances of classes with specific attributes and behaviors.

What is inheritance in OOP? Provide an example.

• Inheritance in OOP is a mechanism where a new class inherits properties and behaviors from an existing class. An example would be a 'Vehicle' class with properties like 'color' and 'brand', and a 'Car' class that inherits from 'Vehicle' and adds specific properties like 'numDoors' and 'fuelType'.

• Inheritance is a mechanism where a class inherits properties from a subclass.

• An example of inheritance is when a class inherits properties from an interface.

• Inheritance in OOP refers to the process of creating new classes from existing classes.

What is polymorphism in OOP? Give an example.

• Polymorphism allows objects of the same class to have the same behavior

• Polymorphism in OOP refers to the ability of objects to change their shape dynamically

• An example of polymorphism is having a superclass 'Car' with subclasses 'SUV' and 'Truck'

• Polymorphism in OOP allows objects of different classes to be treated as instances of the same class, resulting in different behaviors based on the object type. An example is having a superclass 'Animal' with subclasses 'Dog' and 'Cat', where both subclasses can have a method 'makeSound()' implemented differently.

What is encapsulation in OOP? Why is it important?

• Encapsulation in OOP is primarily focused on optimizing code execution speed.

• Encapsulation in OOP is about creating nested objects for better organization.

• Encapsulation in OOP is only useful for small-scale projects.

• Encapsulation in OOP is important because it promotes data security, code reusability, and easier maintenance by bundling data and methods into a single unit and hiding the internal state of an object.

What is the difference between public, private, and protected access specifiers in C++?

• Protected members are only accessible within the class itself

• Public members are only accessible within the class itself

• Public members are accessible from outside the class, private members are only accessible within the class itself, and protected members are accessible within the class and its subclasses.

• Private members are accessible from outside the class

Explain the concept of constructors and destructors in OOP.

• Constructors define methods, while destructors handle exceptions.

• Constructors initialize objects, while destructors clean up resources.

• Constructors allocate memory, while destructors release memory.

• Constructors create objects, while destructors destroy objects.

What is a virtual function in C++?

• A virtual function in C++ is a member function that is declared within a base class and is redefined by a derived class. It allows dynamic binding and enables polymorphism in C++.

• A virtual function in C++ is a function that is used for input/output operations.

• A virtual function in C++ is a function that can only be called once.

• A virtual function in C++ is a function that is static and cannot be overridden.

What is an abstract class in C++?

• An abstract class in C++ is a class that can be instantiated multiple times.

• An abstract class in C++ is a class that cannot be instantiated and is used as a base class for other classes.

• An abstract class in C++ is a class that has no member functions.

• An abstract class in C++ is a class that does not have any data members.