#include<iostream.h>

template<class T> class Array{
private:
    T * arr;
    int sz;

public:

    Array(int size);
    Array(const Array& arr2);

    virtual ~Array();

    Array & operator = (const Array& arr2);
    T& operator [] (int j);
};

template <class T> Array <T>::Array(int size) {
    sz = size;
    arr = new T[size];
}

template <class T> Array <T>::~Array() {
    delete [] arr;
}

template <class T> T& Array <T>::operator [] (int j) {
    return arr[j];
}

void main() {

    Array<double> darr(20);
    for(int i=0;i<20;i++) darr[i]=i*3.4;

    cout<<darr[4]<<'\n';

}