What is class and object in C++?

What is class and object in C++?

In this chapter of C++ interview questions, we will learn about:

  • what is class in c++?
  • what is object in c++?
  • syntax and example of class and object in c++

What is Class in C++?

Classes are expanding concepts of structure in C, they can contain data members also contain functions as members.


It is a new way of creating and implementing a user-defined data type.


Syntax for class:  

Class class-name {

  access_specifier1 member1;
  access_specifier2 member2;


access_specifier modify the acess rights for members.

What is object in c++?

A class provides the blueprints for objects, so basically an object is created from a class.


When a program is executed the objects interact by sending messages to one another.


Syntax for object: 

If a class name is Rectangle, then two objects of class Rectangle are:

  1. Rectangle R1;
  2. Rectangle R2;

Similarly we can create any number of objects as per our requirement.

Example of class and object in c++

In the below example of class and object in c++:

  • We have a class named 'Rectangle'
  • There are two objects created - R1 and R2
  • These objects will use the attributes defined in class like width and length according to their own requirements.
using namespace std;

class Rectangle //Class Declaration
double width;
double length;

int main()
Rectangle R1;  //Object1
Rectangle R2;   //Object2
double area;


cout<<"Area of Rectangle 1"<<" "<<area<<endl;

cout<<"Area of Rectangle 2"<<" "<<area<<endl;


Area of Rectangle 1 35.0

Area of Rectangle 2 120.0


As shown above, we can create multiple other objects like R1 and R2 and define their own property i.e. width and length to use for specific purpose.

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Subhajit Guha Thakurta
Page Views :    Published Date : Jan 16,2021  
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