Mastering C++ Concepts

What is the purpose of a constructor in C++?

• To manage memory allocation for objects.

• To initialize objects of a class.

• To define the class structure.

• To delete objects of a class.

Explain the difference between a class and a struct in C++.

• Classes default to private access, while structs default to public access.

• Classes are used for procedural programming, while structs are for object-oriented programming.

• Structs support inheritance, whereas classes do not.

• Classes can only contain methods, while structs can only contain data.

What is polymorphism in C++?

• Polymorphism allows for multiple inheritance in C++.

• Polymorphism is the ability to present the same interface for different data types in C++.

• Polymorphism refers to the use of templates in C++.

• Polymorphism is the process of compiling code in C++.

How do you declare a pointer in C++?

• int *ptr;

• int &ptr;

• int *ptr[];

• int ptr;

What is the significance of the 'this' pointer?

• The 'this' pointer helps in creating new instances of a class.

• The 'this' pointer is essential for managing memory allocation in a program.

• The 'this' pointer is used for defining static methods in a class.

• The 'this' pointer is significant for accessing the current object's members and methods in a class.

What are templates in C++?

• Templates are a feature in C++ that enables generic programming, allowing functions and classes to work with any data type.

• Templates are a method for error handling in C++.

• Templates are used for memory management in C++.

• Templates are a way to define constants in C++.

Explain the concept of inheritance in C++.

• Inheritance allows a base class to inherit from derived classes, limiting code flexibility.

• Inheritance is a method to create multiple instances of a class without sharing attributes.

• Inheritance allows a derived class to inherit attributes and methods from a base class, promoting code reusability and establishing class relationships.

• Inheritance enables a class to override methods from another class, reducing code efficiency.

What is the difference between deep copy and shallow copy?

• Shallow copy duplicates all objects; deep copy references original objects.

• Deep copy references original objects; shallow copy duplicates all objects.

• Shallow copy references original objects; deep copy duplicates all objects.

• Shallow copy creates a new object; deep copy shares references.

How do you handle exceptions in C++?

• Use try, catch, and throw keywords to handle exceptions in C++.

• Use only the throw keyword for exception handling.

• Utilize if-else statements to manage exceptions.

• Ignore exceptions and let the program crash.

What is the role of the 'virtual' keyword?

• The 'virtual' keyword enables polymorphism in C++.

• The 'virtual' keyword is used for static binding in C++.

• The 'virtual' keyword restricts function overriding in C++.

• The 'virtual' keyword defines a constant variable in C++.