Moving arrow

#include <iostream>
#include <windows.h>
#include <conio.h>

using std::cout;
using std::cin;
using std::endl;

void main()
{
    int pos = 0, size = (setlocale(LC_ALL, "Russian"), cout << "Введите размер фигуры: ", cin >> size, size /= 2, size);
    char move = 0;

    while (true)
    {
        for (int i = 0; i < size; i++, cout << endl)
        for (int j = 0; j < size * 10; ((j == 0 + pos || j == i + 2 + pos) ? cout << ' ' : cout << '*'), j++);

        for (int i = 0; i < size; i++, cout << endl)
        for (int j = 0; j < size * 10; ((j == 0 + pos || j == size - i + 1 + pos) ? cout << ' ' : cout << '*'), j++);

        move = getch();

        if (move == 100 || move == 68)
        {
            if (pos < size * 10) pos++;
            else pos = 0;
        }




        Sleep(50);
        system("cls");
    }
}