18 Questions
What is the primary purpose of defining a class?
To define a blueprint or template for a data type
What does the Partial keyword signify in a class definition?
It indicates that the class is incomplete and must be combined with another partial definition
Which of the following statements about objects is true?
Objects are instances of a class
What is the purpose of the MustInherit keyword in a class definition?
It specifies that the class can only be used as a base class and cannot be instantiated directly
Which keyword is used to specify the base class that a class inherits from?
Inherits
Which of the following access modifiers allows a class member to be accessible only within the class itself?
Private
What does the 'Shadows' keyword indicate in a class definition?
It specifies that the class redefines an existing element in a base class.
What is the purpose of the 'NotInheritable' keyword in a class definition?
To restrict the class from being used as a base class.
How does the 'Partial' keyword affect a class definition?
Implies a partial definition of the class.
What does it mean if a class is defined with 'MustInherit' keyword?
The class can only be used as a base class and cannot be instantiated directly.
Which keyword in a class definition specifies the base class it is inheriting from?
'Inherits'
What is the significance of 'accessmodifier' in a class definition?
Its purpose is to define the access levels of the class members.
What does encapsulation in object-oriented programming refer to?
Hiding the implementation details of a class and exposing only necessary information
In the given code, what is the purpose of the 'setLength', 'setBreadth', and 'setHeight' functions in the Box class?
To set the values of length, breadth, and height respectively
What is a member function in a class?
A function that operates on any object of the class and has access to all members of the class
What does a public member function allow in a class?
Access to private member variables
Which feature of object-oriented programming helps in ensuring that class attributes are accessed through public member functions only?
Encapsulation
How does a member variable differ from a member function in a class?
Member variables store data for an object, while member functions operate on the data.
Study Notes
Class Definition
- A class is a blueprint for a data type that defines what an object of the class will consist of and what operations can be performed on it.
- A class definition starts with the keyword
Classfollowed by the class name and ends with theEnd Classstatement. - Class definition can include access modifiers, inheritance, interfaces, and other attributes.
Class Members
- Members of a class are variables and methods that constitute the class.
- Members can be data members (variables) or function members (methods).
Class Instantiation
- Objects are instances of a class.
- Objects can be declared and initialized using the
Newkeyword.
Access Modifiers
- Access modifiers define the access levels of a class or its members.
- Access modifiers include
Public,Protected,Friend,Protected Friend, andPrivate.
Inheritance
- A class can inherit from a base class using the
Inheritskeyword. - The
MustInheritkeyword specifies that a class can be used only as a base class and not instantiated directly. - The
NotInheritablekeyword specifies that a class cannot be used as a base class.
Interfaces
- A class can implement interfaces using the
Implementskeyword. - Interfaces define a contract that must be implemented by the class.
Encapsulation
- Encapsulation is a concept where member variables are kept private and accessed through public member functions.
- Member functions operate on an object of the class and have access to all members of the class for that object.
Member Functions
- Member functions are functions that have their definition or prototype within the class definition.
- Member functions can operate on any object of the class and have access to all members of the class for that object.
Learn about defining a class as a blueprint for a data type, understanding what an object of the class consists of and the operations that can be performed on it, and how objects are instances of a class.
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