#include <iostream>
#include <string>

using namespace std;

class rekenmachine
{
public:
    rekenmachine();
    double optellen(getal1,getal2);
    double aftrekken(getal1,getal2);
    double delen(getal1,getal2);
    double maal(getal1,getal2);
private:
    double getal1;
    double getal2;
}