#include <iostream>
    #include <cmath>
    using namespace std;
    class ComplexNumber
    {
        private:
        double RealNumber;
        double ImagNumber;
        public:
        ComplexNumber(double r = 0.0, double i = 0.0) : RealNumber(r), ImagNumber(i)
        {}
        double mag()
        {  
            return getMag();
        }
        operator double ()
        {
            return getMag();
        }
        private:
        double getMag()
        {
            return sqrt(RealNumber * RealNumber + ImagNumber * ImagNumber);
        }
    };
    int main()
    {
        ComplexNumber comp(2.0, 5.0);
        cout << comp.mag()<<" ";
        cout << comp;
        return 0;
    }