C++ Program with OOP Class Example

Hello Everyone!

In this tutorial, we will learn how to implement the concept of Class and its members, in the C++ programming language.

To understand the concept of Class and its members, we will recommend you to visit here: Concept of C++ Class, where we have explained it from scratch.


#include <iostream>
#include <vector>

using namespace std;

class studyTonight {

    //variable declaration- can be used only within the class as it's declared private
        int value;

    //Public methods can be called from anywhere- inside as well as outside the class
        void input() {
            cout << "Entering the input() function\n";
            cout << "Enter an integer you want to display: ";
            cin >> value;
            cout << "Exiting the input() function\n\n";

    void display() {

        cout << "\nEntering the display() function\n";
        cout << "The value entered is: ";
        cout << value;
        cout << "\nExiting the display() function\n\n";

int main() {
    cout << "\n\nWelcome to Studytonight :-)\n\n\n";
    cout << " =====  Program to demonstrate the concept of Class, in CPP  ===== \n\n";

    //Declaring class object to access class members from outside the class
    studyTonight object;

    cout << "\n\nCalling the input() function from the main() method\n\n\n";

    cout << "\nCalling the display() function from the main() method\n\n\n";


    cout << "\n\nExiting the main() method\n\n\n";

    //object.value- This will produce an error because variable is declared to be private and hence cannot be accessed from outside the class

    return 0;


C++ Class

We hope that this post helped you develop a better understanding of the concept of Class and its members, in C++. For any query, feel free to reach out to us via the comments section down below.

Keep Learning : )