Object-Oriented Programming: Classes and Objects
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Questions and Answers

What is the main purpose of a class in object-oriented programming?

  • To declare variables and methods directly
  • To define attributes and methods of an object
  • To serve as a template for objects (correct)
  • To create an instance of an object

What do individual objects inherit from a class when they are created?

  • Only methods
  • Only variables
  • All variables and methods (correct)
  • None of the above

What is the term used to describe a variable declared directly in a class?

  • Method
  • Field (correct)
  • Attribute
  • Property

Why is it a good practice to start with an uppercase first letter when naming classes?

<p>It is a good practice, but not required (D)</p> Signup and view all the answers

What is an example of an object in real life?

<p>A car object (A)</p> Signup and view all the answers

What is the keyword used to create a class in C#?

<p>class (A)</p> Signup and view all the answers

What is the name of the variable that holds the value 'red' in the class Car?

<p>color (C)</p> Signup and view all the answers

What is the purpose of creating an object of a class?

<p>To access the fields of the class (B)</p> Signup and view all the answers

What is the syntax to access the fields of a class?

<p>Using the dot syntax (.) (B)</p> Signup and view all the answers

What happens when you leave the fields blank and modify them when creating the object?

<p>You can modify them later when creating the object (A)</p> Signup and view all the answers

What is the benefit of creating multiple objects of one class?

<p>It allows you to create multiple objects with different values (C)</p> Signup and view all the answers

What is the output of the following code: Console.WriteLine(myObj.color);?

<p>The output will be the value of the color field (D)</p> Signup and view all the answers

What is the purpose of access modifiers in classes?

<p>To control the visibility of class members (C)</p> Signup and view all the answers

What happens if you try to access a private field outside the class?

<p>An error will occur (C)</p> Signup and view all the answers

What is the main advantage of declaring fields as private?

<p>It helps to achieve encapsulation (B)</p> Signup and view all the answers

What is the default access level of a field if no access modifier is specified?

<p>Private (C)</p> Signup and view all the answers

Which access modifier makes a field accessible to all classes?

<p>Public (A)</p> Signup and view all the answers

What is the purpose of encapsulation in object-oriented programming?

<p>To hide sensitive data from users (C)</p> Signup and view all the answers

What is the primary reason for using inheritance in programming?

<p>To reduce code duplication and increase reusability (B)</p> Signup and view all the answers

What is the process of representing essential features without including background details?

<p>Abstraction (A)</p> Signup and view all the answers

What is an abstract class in C#?

<p>A restricted class that cannot be used to create objects (C)</p> Signup and view all the answers

Why is abstraction important in programming?

<p>To hide implementation details from the user (A)</p> Signup and view all the answers

What is an example of abstraction in real life?

<p>Logging in to a social networking site (A)</p> Signup and view all the answers

What is the keyword used to declare an abstract class or method in C#?

<p>abstract (C)</p> Signup and view all the answers

What is the purpose of a constructor in a class?

<p>To set initial values for fields (B)</p> Signup and view all the answers

What happens if you do not create a class constructor yourself?

<p>You will not be able to set initial values for fields (A)</p> Signup and view all the answers

What is the name of the constructor in the following code: class Car { public string model; public Car (string modelName) { model = modelName; } }

<p>Car (B)</p> Signup and view all the answers

How many parameters can a constructor have?

<p>As many as you want (B)</p> Signup and view all the answers

What is the purpose of the Main method in the following code?

<p>To start the program execution (A)</p> Signup and view all the answers

What is the output of the following code: class Car { public string model; public Car (string modelName) { model = modelName; } static void Main(string[] args) { Car Ford = new Car("Mustang"); Console.WriteLine(Ford.model); } }

<p>Mustang (A)</p> Signup and view all the answers

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