Private Access

#include <iostream>
using namespace std;

class Sensor {
private:
   int m_Val;
public:
   void setValue(int v)
   {
      m_Val = v;
   }
   int getValue(void)
   {
      return m_Val;
   }
};

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