Is it possible to implement a function inside a data structure, and how would it work?

In C#, a struct can contain methods, including functions. This allows encapsulating behavior along with data. Methods inside a struct work the same way as in classes, but it is important to remember that structs are value types, and passing a struct to a method creates a copy.

Example:

struct Point
{
    public int X, Y;

    public void Move(int dx, int dy)
    {
        X += dx;
        Y += dy;
    }
}

When calling Move on a struct instance, a copy is modified if the struct is not passed by reference. To make changes persistent, you can use ref or in parameters.