Buffer that overwrite old values

void Main()

{

    IntegerBuffer buffer = new();

    for (int i = 0; i < 10; i++)

    {

        buffer.AddInt(i);

    }

}

public class IntegerBuffer

{

    static int arraysize=6;

    int top=0;

    int[] arrInt = new int[arraysize];

    public void AddInt(int num)

    {

        if (top > arraysize-1) top = 0;

        arrInt[top] = num;

        top++;

        ShowBuffer();

    }

    void ShowBuffer()

    {

        foreach (int i in arrInt)

        {

            Console.Write(i);

        }

        Console.WriteLine();

    }

}

//----------output---------------------------

000000

010000

012000

012300

012340

012345

612345

672345

678345

678945