#include <iostream>
using namespace std;
 
class Temperature
{
    public:
        //these static functions return a temporary object of type Temperature
        static Temperature Fahrenheit (double f);
        static Temperature Celsius (double c);
        static Temperature Kelvin (double k);
        //A static member function can't refer to non-static data.
        double getTemperature() { return _temp; }
    private:
        Temperature (double temp); //Constructor is private.
        double _temp;
};
 
//_temp instantiated outside of Temparature class.
Temperature::Temperature (double temp):_temp (temp) {} 
 
Temperature Temperature::Fahrenheit (double f)
{ return Temperature ((f + 459.67) / 1.8); }
 
Temperature Temperature::Celsius (double c)
{ return Temperature (c + 273.15); }
 
Temperature Temperature::Kelvin (double k)
{ return Temperature (k); }
 
int main() {
	// We are initializing the objects created here via kelvin(), celsius() and fahrenheit()  
	// to objects
	// kelvin, celsius and fahrenheit.
	Temperature kelvin = Temperature::Kelvin (300.0);
	Temperature celsius = Temperature::Celsius (26.85);
	Temperature fahrenheit = Temperature::Fahrenheit(80.33);
 
	cout << "Entered kelvin " << kelvin.getTemperature () << endl;
	cout << "Entered celsius " << celsius.getTemperature () << endl;
	cout << "Entered fahrenheit " << fahrenheit.getTemperature () << endl;
 
	return 0;
}
 
/*
Output:
 
Entered kelvin 300
Entered celsius 300
Entered fahrenheit 300
*/