Templates...

hi all,
i just learned the topic about templates...
i successfully made a template program in which the instance of the templated class is a normal instance:

Code:

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


template<class aType>
class calc{


    public:
        void add();
        void sub();
        void mul();
        void div();
    private:
        aType a;
        aType b;


};


template<class aType> void calc<aType> :: add(){


    cout << "Enter a number: ";
    cin >> a;
    cin.ignore();


    cout << "Enter another number: ";
    cin >> b;
    cin.ignore();


    cout << "\n===\n\nThe sum is " << a + b << "...\n\n===";
    cout << "PRESS ENTER TO CONTINUE===";
    cin.get();
    system("cls");


}


template<class aType> void calc<aType> :: sub(){


    cout << "Enter a number: ";
    cin >> a;
    cin.ignore();


    cout << "Enter another number: ";
    cin >> b;
    cin.ignore();


    cout << "\n===\n\nThe difference is " << a - b << "...\n\n===";
    cout << "PRESS ENTER TO CONTINUE===";
    cin.get();
    system("cls");


}


template<class aType> void calc<aType> :: mul(){


    cout << "Enter a number: ";
    cin >> a;
    cin.ignore();


    cout << "Enter another number: ";
    cin >> b;
    cin.ignore();


    cout << "\n===\n\nThe product is " << a * b << "...\n\n===";
    cout << "PRESS ENTER TO CONTINUE===";
    cin.get();
    system("cls");


}


template<class aType> void calc<aType> :: div(){


    cout << "Enter a number: ";
    cin >> a;
    cin.ignore();


    cout << "Enter another number: ";
    cin >> b;
    cin.ignore();


    cout << "\n===\n\nThe quotient is " << a / b << "...\n\n===";
    cout << "PRESS ENTER TO CONTINUE===";
    cin.get();
    system("cls");


}


int main(){


    calc <double> co;
    co.add();
    co.sub();
    co.mul();
    co.div();




}

but what should i do if i want to create a pointer instance of the templated class ?

i've tried this but doesn't work:

Code:

    calc *co = new calc;
    co->add();
    co->sub();
    co->mul();
    co->div();

You need to specify a template parameter both for the type of the variable and for the object you want to create a new instance of, e.g.:

Code:

calc<double> *cop = new calc<double>();