Technical interview questions and answers play a major role in C++ Interviews because C++ is widely used in system programming, game development, competitive coding, and performance-critical applications. Companies expect candidates to know OOP concepts, classes, inheritance, polymorphism, references, memory management, STL, and exception handling. These questions often appear in campus placements and software interviews conducted by TCS, Wipro, Infosys, Cognizant, and Capgemini. This guide covers frequently asked C++ interview questions with simple explanations that help freshers and job seekers strengthen their programming foundation. Preparing these questions will help you perform well in coding tests, technical rounds, and real-time problem-solving interviews.
Showing 10 of 92 questions
41. Describe the main characteristics of static functions.
The main characteristics of static functions include,
Ø It is without the a this pointer,
Ø It can't directly access the non-static members of its class
Ø It can't be declared const, volatile or virtual.
Ø It doesn't need to be invoked through an object of its class, although for
convenience, it may.
42. Will the inline function be compiled as the inline function always? Justify.
An inline function is a request and not a command. Hence it won't be compiled as an inline function always.
43. Define a way other than using the keyword inline to make a function inline.
The function must be defined inside the class.
44. How can a '::' operator be used as unary operator?
The scope operator can be used to refer to members of the global namespace.Because the global namespace doesnt have a name, the notation :: member-name refers to a member of the global namespace. This can be useful for referring to members of global namespace whose names have been hidden by names declared in nested local scope. Unless we specify to the compiler in which namespace to search for a declaration,the compiler simple searches the current scope, and any scopes in which the current scop
45. What is placement new?
When you want to call a constructor directly, you use the placement new.
Sometimes you have some raw memory that's already been allocated, and you need to
construct an object in the memory you have. Operator new's special version placement
new allows you to do it.
46. What is the difference between an object and a class?
All objects possessing similar properties are grouped into class.
Example :person is a class, ram, hari are objects of person class. All have similar attributes like name, age, sex and similar operations like speak, walk.
47. What is a class?
The objects with the same data structure (attributes) and behavior (operations) are called class.
48. What is an object?
It is an entity which may correspond to real-world entities such as students, employees, bank account. It may be concrete such as file system or conceptual such as scheduling policies in multiprocessor operating system.
Every object will have data structures called attributes and behavior called operations.
49. What is the difference between class and structure?
In class the data members by default are private but in structure they are by default public.
50. Define object based programming language?
Object based programming language support encapsulation and object identity without supporting some important features of OOPs language.
Object based language=Encapsulation + object Identity