Pass variable as parameter in c++ template

I'm trying to implement the follwing function calling:

template<int index>
void print() {
    std::cout << index;
}

constexpr int getConstexpr(int a) {
     return a;
}

void function_to_template(int i) {
    const int j = getConstexpr(i);
    print<j>();
}

void main() {
    for(int = 0 ; i < 10; i++) {
       function_to_template(i);
    }
}

and I got the following error:

fatal error: no matching member function for call to 'print'.

any I idea how to pass variable as parameter in c++ template ?

thanks.