How to solve "[Warning] declares a non-template function" when cPP overloads input and output functions?

I"m working on a cPP template problem, described as follows:
"create a template for the Array class. This template allows the Array object to instantiate a specific element type that specifies the number of elements at compile time. "
and the compilation always fails when I overload the input and output stream functions.

the compiler shows:
[Warning] friend declaration "std::istream& operator > > (std::istream&, Array < T, n > &)" declares a non-template function [- Wnon-template-friend]
[Warning] friend declaration "std::ostream& operator < < (std::ostream&, const Array < T, n > &)" declares a non-template function [- Wnon-template-friend]

the code is as follows:

-sharpinclude<iostream>
using namespace std;
template<class T,int n>
class Array
{
    private:
        T p[n];
        static int count;
    public:
        friend istream & operator>> (istream & in, Array<T,n>& a);
        friend ostream & operator << (ostream & out,const Array<T,n>& a);
        int getSize()
        {
            return n;
        }
        static int getArrayCount()
        {
            return count;
        }
};
template<class T,int n>
istream & operator >> (istream & in,const Array<T,n>& a)
{
    for(int i=0;i<n;iPP)
    {
        in>>a.p[i];
    }
    a.countPP;
    return in;
}
template<class T,int n>
ostream & operator << (ostream & out,const Array<T,n>& a)
{
    for(int i=0;i<n;iPP)
    {
        out<<a.p[i]<<" ";
    }
    return out;
}

paste the main function here:

int main()
{
    Array< int, 5 > intArray1;
    cin >> intArray1;
    Array< int, 5 > intArray2;
    cin >> intArray2;
    Array< float, 5 > floatArray;
    cin >> floatArray;
    cout << "\nIntArray1 contains " << intArray1.getSize() << " Elements.\n";
    cout << "The values in intArray are:\n";
    cout << intArray1;
    cout << "\nIntArray2 contains " << intArray2.getSize() << " Elements.\n";
    cout << "The values in intArray are:\n";
    cout << intArray2;
    cout << "\nDoubleArray contains " << floatArray.getSize() << " Elements.\n";
    cout << "The values in the doubleArray are:\n";
    cout << floatArray;
    cout << "\nThere are " << Array<int,5>::getArrayCount() << " Array<int,5> objects.\n";
    cout << "\nThere are " << Array<float,5>::getArrayCount() << " Array<float,5> objects.\n";
    return 0;
}

I have searched the Internet for a long time and tried a lot of solutions, but neither adding < > after > > in the line
istream & operator > (istream & in,const Array < TMagazn > & a)
nor defining input and output functions in the class does not work.
if defined in a class, the following error appears:
undefined reference to `Array < float, 5 >:: count"
[Error] ld returned 1 exit status

if you add < > after > >, the following error appears:
[Error] template-id "operator > < >" in declaration of primary template

so it"s hard to walk now, and I don"t have a clue at all.
I also hope that all the great gods can answer my doubts and explain why the above three mistakes occurred.
Thank you very much!

CPP

Mar.06,2021

-sharpinclude<iostream> using namespace std; template<typename T> class A { private: T x; void setter(T y) { x = y; } public: explicit A(T a) : x(a) {} template<typename U> friend void foo(A<U> a); }; A<int> x(7); template<typename U> void foo(A<U> a) { x.x = 2; } int main() { A<int> a(7); A<float> b(1.1); foo(b); }