﻿#include <iostream>
using namespace std;

class Calculator {
    public:
        int add(int firstNumber, int secondNumber) {
            return firstNumber + secondNumber;
        }

        double add(double firstNumber, double secondNumber) {
            return firstNumber + secondNumber;
        }
};

int main() {
    Calculator calculator;

    cout << calculator.add(10, 20) << endl;
    cout << calculator.add(10.5, 20.5) << endl;

    return 0;
}