C++ Interview Question and Answers
C++ Interview Question and Answers C++ is a high-level programming language that was developed as an extension of the C programming language. It is a general-purpose language that is widely used in developing operating systems, device drivers, desktop applications, video games, and various other types of software.
C++ Interview Question and Answers C++ supports object-oriented programming (OOP) concepts such as encapsulation, inheritance, and polymorphism, which enable developers to write efficient and reusable code. C++ also provides features such as templates, exceptions, and namespaces, which help programmers to create generic and modular code. C++ code can be compiled into machine code, making it fast and efficient. Additionally, C++ is platform-independent and can be used on a wide range of operating systems, making it a popular choice among developers, Here we are Providing Important C++ Interview Question and Answers.
C++ Interview Question and Answers;
Question 1. What is the difference between C and C++?
Answer: C is a procedural programming language, while C++ supports both procedural and object-oriented programming. C++ also provides features such as templates, exception handling, and namespaces, which are not available in C.
Question 2. What is the difference between a pointer and a reference in C++?
Answer: A pointer is a variable that stores the memory address of another variable, while a reference is an alias for another variable. Once a reference is initialized, it cannot be changed to refer to another variable, while a pointer can be reassigned to point to different variables.
Question 3. What is a virtual function in C++?
Answer: A virtual function is a member function that is declared as virtual in a base class and is intended to be overridden in a derived class. When a virtual function is called using a base class pointer or reference, the correct function implementation in the derived class is called based on the object’s actual type.
Question 4. What is the difference between private and protected access specifies in C++?
Answer: Private members of a class can only be accessed by member functions of the same class, while protected members can also be accessed by member functions of derived classes. Both private and protected members are not accessible by code outside of the class.
Question 5. What is the use of the const keyword in C++?
Answer: The const keyword is used to declare a variable as read-only. Once a variable is declared as const, its value cannot be changed. Const functions are member functions that do not modify the object they are called on.
Question 6. What is the difference between a class and a struct in C++?
Answer: In C++, a class and a struct are almost identical, except for their default access level. In a class, members are private by default, while in a struct, members are public by default.
Question 7. What is the difference between static and dynamic memory allocation in C++?
Answer: Static memory allocation refers to the process of allocating memory at compile time, while dynamic memory allocation refers to the process of allocating memory at runtime using functions such as malloc and new.
Question 8. What is the difference between pass by value and pass by reference in C++?
Answer: Pass by value refers to passing a copy of the argument to a function, while pass by reference refers to passing the memory address of the argument to a function. Pass by reference can modify the original argument, while pass by value cannot, These are just a few examples of the types of questions that might come up in a C++ interview. It’s important to have a strong understanding of C++ fundamentals and be able to explain them clearly and confidently.
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