What to take out in a separate class?

Question

OOP

Guys, hello everyone. There is such a question, I have a program for working with a matrix, but it is implemented using one class, but I need more.
So, what would you advise to make another class in a separate class, otherwise I got confused.
Some code
I would appreciate your help.

Answer 1

Perhaps, if you need exactly two classes, you should create the first class in which memory is allocated for the matrix (in the constructor) and freed (in the destructor). Plus, there is a method for setting and getting a value by index.
In the second class, it is then reasonable to describe and implement methods for various types of filling the matrix and working with it.
Something like this:

class BaseMatrix
{
    private:
        int M, N;
        int * matrix;
    public:
        BaseMatrix(int m, int n);
         ~BaseMatrix();
         void SetItem(int m, int n, int x);
         int GetItem(int m, int n);
}

class Matrix
{
    private:
        BaseMatrix * matrix;
    public:
        Matrix(int m, int n);
        ~Matrix();
        void UserSet();
        void AddRow();
        void DelRow();
}