Calculator using template

#include <iostream>
#include <cmath>
using namespace std;

template<class T>

class calculator{
    T n1, n2;
    public:
    calculator(){
        n1 = 0;
        n2 = 0;
    }
    void input(){
        cout << "Enter num1: " << endl;
        cin >> n1;
        cout << "Enter num2: " << endl;
        cin >> n2;
    }

    void display(){
        cout << n1 << " + " << n2 << " = " << add() << endl;
        cout << n1 << " - " << n2 << " = " << subtract() << endl;
        cout << n1 << " * " << n2 << " = " << product() << endl;
        cout << n1 << " / " << n2 << " = " << divide() << endl;
        cout << n1 << " ^ 2 " << " = " << squaren1() << endl;
        cout << n2 << " ^ 2 " << " = " << squaren2() << endl;
        cout << n1 << " ^ " << n2 << " = " << power() << endl << endl;
    }

    T add(){
        return n1 + n2;
    }

    T subtract(){
        return n1 - n2;
    }

    T product(){
        return n1 * n2;
    }

    T divide(){
        return n1 / n2;
    }

    T squaren1(){
        return pow(n1, 2);
    }

    T squaren2(){
        return pow(n2, 2);
    }

    T power(){
        return pow(n1, n2);
    }


};

int main()
{
    calculator<float> a;
    a.input();
    a.display();
    return 0;
}