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.
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51. Define object oriented language?
Object-oriented language incorporates all the features of object based programming languages along with inheritance and polymorphism.
Example: c++, java.
52. Define OOPs?
OOP is a method of implementation in which programs are organized as co-operative collection of objects, each of which represents an instance of some class and whose classes are all member of a hierarchy of classes united through the property of inheritance.
53. What is public, protected, and private?
These are access specifier or a visibility lebels .The class member that has been declared as private can be accessed only from within the class. Public members can be accessed from outside the class also. Within the class or from the object of a class protected access limit is same as that of private but it plays a prominent role in case of inheritance
54. What is a scope resolution operator?
The scope resolution operator permits a program to reference an identifier in the global scope that has been hidden by another identifier with the same name in the local scope.
55. What do you mean by inheritance?
The mechanism of deriving a new class (derived) from an old class (base class) is called inheritance. It allows the extension and reuse of existing code without having to rewrite the code from scratch.
56. What is abstraction?
The technique of creating user-defined data types, having the properties of built-in data types and a set of permitted operators that are well suited to the application to be programmed is known as data abstraction. Class is a construct for abstract data types (ADT).
57. What is encapsulation?
It is the mechanism that wraps the data and function it manipulates into single unit and keeps it safe from external interference.
58. How variable declaration in c++ differs that in c?
C requires all the variables to be declared at the beginning of a scope but in c++ we can declare variables anywhere in the scope. This makes the programmer easier to understand because the variables are declared in the context of their use.
59. What are the c++ tokens?
c++ has the following tokens
I. keywords
II. Identifiers
III. Constants
IV. Strings
V. operators
60. What do you mean by reference variable in c++?
A reference variable provides an alias to a previously defined variable.
Data type & reference-name = variable name