Error: Use of class template requires template argument list

Question

When I try to run my program this error shows up "error C2955: 'FOURTEEN' : use of class template requires template argument list"

#include <iostream>
using namespace std;
template <class T, int n>
class FOURTEEN
{
private:
    T a[n];
public:
    void ReadData();
    void DisplayData();
};
void FOURTEEN::ReadData()
{
    for(int i=0;i<n;++i)
        cin>>a.[i];
}
void FOURTEEN::DisplayData()
{
    for(int i=0;i<n;++i)
        cin>>a.[i]<<'\t';
    cout<<endl;
}
int main()
{
    FOURTEEN <int, 5>P;
//Read data into array a of object P
    cout<<"Enter 5 numbers: ";
    P.ReadData();
//display data of array a of object P
    P.DisplayData();

    system("pause");
    return 0;
}

Do I have to retype template somewhere else?

Solution

Members of a template class are themselves templates parameterized by the parameters of their template class. When such a member is defined outside its class, it must explicitly be declared a template.

So you need change

void FOURTEEN::ReadData()

to

template <class T, int n>
void FOURTEEN<T, n>::ReadData()

And do the same thing to function DisplayData.

And there're some other errors:

In function ReadData, change

cin>>a.[i];

to

cin>>a[i];

and In function DisplayData, change

cin>>a.[i]<<'\t';

to

cout<<a[i]<<'\t';