Calculate

//Калькулятор через шаблони класу
#include <iostream>

using namespace std;

template <class tType>
class Calculator
{
   private:
          tType a;
          tType b;
          tType c;
   public:
          tType sum()
          {
          cout << "Write a" << endl;
          cin >> a;
          cout << "Write b" << endl;
          cin >> b;
          c = a + b;
          cout << c << endl;
          return c;
          }

          tType rizn()
          {
          cout << "Write a" << endl;
          cin >> a;
          cout << "Write b" << endl;
          cin >> b;
          c = a - b;
          cout << c << endl;
          return c;
          }
          tType dob()
          {
          cout << "Write a" << endl;
          cin >> a;
          cout << "Write b" << endl;
          cin >> b;
          c = a * b;
          cout << c << endl;
          return c;
          }
          tType dil()
          {
          cout << "Write a" << endl;
          cin >> a;
          cout << "Write b" << endl;
          cin >> b;
          c = a / b;
          cout << c << endl;
          return c;
          }
          int Vibor()
           {
              int Answer;
              cout << "1 - dodavanja" << endl;
              cout << "2 - vidnimanja" << endl;
              cout << "3 - dobytok" << endl;
              cout << "4 - dilenja" << endl;
              cin >> Answer;
              return Answer;
          }
          Calculator()
   {
    while(1)
    {
        switch(Vibor())
        {
        case 1: sum();break;
        case 2: rizn();break;
        case 3: dob();break;
        case 4: dil();break;
        default:
        cout<<"Íåïðàâèëüíèé âèá³ð";Calculator();break;
               }
    }
}
};
int main ()
{
    Calculator <float> obj;
    float sum=obj.sum();
    float rizn=obj.rizn();
    float dob=obj.dob();
    float dil=obj.dil();
    return 0;
}