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Questions and Answers
What is the main purpose of using inheritance in object-oriented programming?
What is the main purpose of using inheritance in object-oriented programming?
- To increase the complexity of the code
- To implement multiple versions of a function
- To restrict data access within a class
- To allow new classes to inherit properties and behaviors from existing classes (correct)
What is an appropriate role for a destructor in a C++ class?
What is an appropriate role for a destructor in a C++ class?
- To initialize instance variables
- To release resources before the object is destroyed (correct)
- To allocate memory for class data
- To create default values for an object's attributes
Which of the following concepts ensures that an object's internal state cannot be directly accessed or modified from outside its class?
Which of the following concepts ensures that an object's internal state cannot be directly accessed or modified from outside its class?
- Encapsulation (correct)
- Abstraction
- Composition
- Polymorphism
What does polymorphism allow in object-oriented programming?
What does polymorphism allow in object-oriented programming?
What is the purpose of an abstract class in C++?
What is the purpose of an abstract class in C++?
What is the function of a copy constructor in a C++ class?
What is the function of a copy constructor in a C++ class?
Which feature in C++ allows a function to accept objects of multiple types as arguments?
Which feature in C++ allows a function to accept objects of multiple types as arguments?
In a C++ class, what does the keyword 'virtual' indicate when used before a function declaration?
In a C++ class, what does the keyword 'virtual' indicate when used before a function declaration?
What does the 'friend' keyword do in C++?
What does the 'friend' keyword do in C++?
What will happen if you attempt to delete an object that has a nullptr value in C++?
What will happen if you attempt to delete an object that has a nullptr value in C++?
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Study Notes
Inheritance in Object-Oriented Programming
- Enables the creation of a new class based on an existing class, promoting code reusability.
- Allows derived classes to inherit attributes and methods from base classes, reducing redundancy.
- Supports the concept of hierarchical classification, organizing classes into a relationship structure.
Destructor in C++ Class
- A special member function invoked when an object goes out of scope or is explicitly deleted.
- Responsible for releasing resources such as memory and file handles to prevent memory leaks.
- Can perform cleanup tasks such as closing network connections or releasing system resources.
Encapsulation
- Ensures that an object's internal state is protected from external interference.
- Achieved through access specifiers like private and protected, limiting visibility to class methods.
- Maintains data integrity by controlling access to sensitive information or critical data.
Polymorphism in Object-Oriented Programming
- Allows methods to do different things based on the object that calls them, enhancing flexibility.
- Can be achieved through method overriding and method overloading.
- Supports dynamic method resolution, enabling the program to determine the appropriate method at runtime.
Abstract Class in C++
- Serves as a blueprint for other classes, defining a common interface without providing full implementation.
- Contains at least one pure virtual function, making it impossible to instantiate directly.
- Facilitates designing a framework where derived classes can provide specific implementations for the defined interface.
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