C++ Program to add two numbers using the default constructor

In this program, You will learn how to add two numbers using the default constructor in C++.

30 = 20 + 10

40 = 20 + 20

Example: How to add two numbers using default constructor in C++.

using namespace std;

class Add {
   int a, b, c;

   Add() {
       cout << "Enter two numbers:";
       cin >> a >> b;

   void sum() {
       c = a + b;

   void display() {
       cout << "Sum is:" << c;

int main() {

   Add obj;

   return 0;


Enter two numbers:10 20
Sum is:30

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