A simple program to demonstrate the concept of object oriented programming to add the sum of three numbers using C++ programming language.

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Program Listing
#include <iostream>

using namespace std;

class Calculator {
    private:
        int num1;
        int num2;
        int num3;
    public:
        Calculator(int n1, int n2, int n3) {
            num1 = n1;
            num2 = n2;
            num3 = n3;
        }
        int add() {
            return num1 + num2 + num3;
        }
};

int main() {
    // Create an object of the Calculator class
    Calculator calc(10, 20, 30);

    // Call the add() method to add the three numbers
    int result = calc.add();

    // Print the result
    cout << "The sum of the three numbers is: " << result << endl;
    return 0;
}