Private Access

#include <iostream>
using namespace std;

class Sensor {
private:
   int value;
public:
   void setValue(int v) { this->value = v; }
   int getValue() { return value; }
};

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