Private Access

#include <iostream>

class Sensor
{
private:
    int value;

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

    int getValue()
    {
        return value;
    }
};

int main()
{
    Sensor s;
    s.setValue(75);
    std::cout << "Sensor value: " << s.getValue() << "\n";

    return 0;
}