Private Access

#include <iostream>
using namespace std;

class Sensor {
private:
   int value;
public:
   void setValue(int n) {
      value = n;
   }

   int getValue() {
      return value;
   }
};

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