Starting a career in software development begins with building a strong foundation in programming. Among all programming languages, C++ remains one of the most important, especially for freshers preparing for interviews. Companies often ask fundamental and scenario-based questions to test both knowledge and problem-solving skills. Here are some top C++ interview questions and answers for freshers that can help you prepare better.
1. What are the key features of C++?
C++ is an object-oriented programming language known for features like classes, inheritance, polymorphism, encapsulation, and abstraction. It also supports low-level memory manipulation, making it powerful and versatile.
2. What is the difference between C and C++?
C is a procedural programming language, while C++ is both procedural and object-oriented. C++ provides additional features like classes, objects, function overloading, and exception handling.
3. Explain OOPS concepts in C++.
Object-Oriented Programming (OOP) concepts include:
- Encapsulation: Binding data and functions together.
- Inheritance: Reusing code by creating new classes from existing ones.
- Polymorphism: Performing a single action in different ways.
- Abstraction: Hiding implementation details and showing only necessary features.
4. What are constructors and destructors?
Constructors are special class functions automatically invoked when an object is created. Destructors are used to release resources when an object is destroyed.
5. What is the difference between compile-time and run-time polymorphism?
- Compile-time polymorphism: Achieved through function overloading and operator overloading.
- Run-time polymorphism: Achieved through function overriding using virtual functions.
6. What is a virtual function?
A virtual function is a member function in a base class that can be overridden in a derived class. It helps achieve run-time polymorphism.
7. What are pointers in C++?
Pointers are variables that store memory addresses. They are widely used in C++ for dynamic memory allocation and working with arrays.
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