Providing the size (const) of the member array as the constructor argument RELOADED

I have gone through some of the threads on the same topic but they are really advanced like set and all. For someone just finding his footsteps in C++, what would be the best way to deal with this?

The following code gives me error:

class AStack {
    public:
        Astack(int size) : Max_Size(size) {
        }
        void push(int);
        int pop();
        int top();
        bool isEmpty();
        void Flush();

    private:
        const static int max_Size;
        int a[max_Size];
        int index = -1; // Index of the top most element
};