Private Access

#include <iostream>
using namespace std;

class Sensor {
private:
    int value;   // private variable

public:
    void setValue(int v) {   // setter
        value = v;
    }

    int getValue()  {   // getter
        return value;
    }
};

int main() {
    Sensor s;
    s.setValue(75);
    cout << "Sensor value: " << s.getValue();
    return 0;
}