C++ basics Interview Questions and Answers. C++ is an Object-Oriented programming language. It is a superset of C language and also called as extended version of C programming language. In this article, you will learn some of the most common C++ Interview questions and answers.
1. What is C++ Programming Language?
It is an object-oriented programming language developed in 1985. Bjarne Stroustrup created it. Basically, C++ is an updated version of C with classes and objects.
2. What is an Object-Based Programming Language?
The object-based programming language allows users to create applications using objects and classes. The concept of object-based programming is similar to that of object-oriented programming, but it has inheritance as an added benefit. There are many object-based programming languages, such as JavaScript, Python, and Ruby.
3. Define Object Oriented Language?
The purpose of an object-oriented language is to create models that are based on the real world by using objects and classes. Object-oriented programming (OOP) languages are designed to overcome the drawbacks of procedural programming languages by allowing developers to create objects that can hold both data and behavior. Examples of object-oriented languages include Java, C++, Python, and Ruby.
4. Can you name a few pure object-oriented languages?
Smalltalk, Java, etc.
5. What are the advantages of C++?
These are some of the advantages of the C++ language:
- Due to its cross-platform capability, it is a portable language.
- It is an object-oriented programming language that includes classes and objects.
- Rich function libraries are available.
- As it supports polymorphism, inheritance, and friend functions, it is a powerful tool for designing applications.
- The data hiding feature of C++ ensures the security of data.
6. What is Variable in C++?
A variable is a name of memory location.
7. In C++, what are Constants?
Constants are data items whose values cannot be changed.
8. What are Character Constants in C++?
A character constant is a constant that contains a single character enclosed within a single quote.
9. What are C++ Keywords?
A keyword in C++ is a predefined word. The meaning of keywords cannot change. So, they are called reserve words.
10. What are C++ Tokens?
Tokens are the smallest individual units in programs.
11. Can you tell me what a C++ function is?
It is a block of code that can be accessed anywhere within the system and that serves a specific purpose.
12. When should Variables be declared?
Variables should be declared as soon as they are needed. In other words, whenever a program needs to use a variable, it should be declared before it is used.
13. In C++, what is a Function Prototype?
A function prototype is the skeleton of a function.
14. What is Function Calling in C++?
A function gets called when the function name is followed by a semicolon.
15. How does C++ define functions?
Defining a function involves the use of braces with one or more statements within.
16. What are Control Statements in C++?
A programming language uses control statements to cause the flow of execution to advance and branch based on changes to the state of a program. Control statements in C++ programs fall into three categories: selection, iteration, and jump.
17. In C++, what is a Selection Statement?
By using selection statements, the program can determine which path to follow based on the outcome of an expression or the state of a variable.
18. What are Iteration Statements in C++?
The iteration statement allows a program to repeat one or more statements. For, while, and do-while are the three iteration statements in C++.
19. What are Jump Statements in C++?
Programs can execute in a nonlinear manner using jump statements.
20. In C++, what is an Array?
The collection of similar data types stored in a contiguous memory location is known as an array.
21. Can you tell me what an Object in C++ is?
An object is any physical thing that exists in the real world.
22. What is Class in C++?
A C++ class is a collection of functions and data with a single name. This is a blueprint for an object. Classes are one of the most important parts of a C++ program. C++ programs can have any number of classes.
23. Describe the Structure of C++.
The concept of a structure refers to a collection of dissimilar data types.
24. What is the difference between Class and Structure?
In a class, the data members are private by default, while in a structure, they are public by default.
25. What is the insertion operator and what does it do?
The insertion operator (<<) is a member operator of the ostream object and is used for writing to the output device.
26. What is the extraction operator and what does it do?
The extraction operator (>>) is a member operator of the istream object and is used for writing to your program’s variable.