Ncurses Simple moving box

#include <ncurses.h>

typedef struct _win_border_struct {
    chtype  ls, rs, ts, bs,
        tl, tr, bl, br;
}WIN_BORDER;

typedef struct _WIN_struct {

    int startx, starty;
    int height, width;
    WIN_BORDER border;
}WIN;

void init_win_params(WIN *p_win);
void print_win_params(WIN *p_win);
void create_box(WIN *win, bool flag);

int main(int argc, char *argv[])
{   WIN win;
    int ch;

    initscr();          /* Start curses mode        */
    start_color();          /* Start the color functionality */
    cbreak();           /* Line buffering disabled, Pass on
                     * everty thing to me       */
    keypad(stdscr, TRUE);       /* I need that nifty F1     */
    noecho();
    curs_set(FALSE);
    init_pair(1, COLOR_CYAN, COLOR_BLACK);

    /* Initialize the window parameters */
    init_win_params(&win);
    print_win_params(&win);

    attron(COLOR_PAIR(1));
    refresh();
    attroff(COLOR_PAIR(1));

    create_box(&win, TRUE);
    while((ch = getch()) != KEY_F(1))
    {   switch(ch)
        {   case KEY_LEFT:
            if(win.startx>1){
                create_box(&win, FALSE);
                --win.startx;
                create_box(&win, TRUE);
            }
                break;
            case KEY_RIGHT:
            if(win.startx<122){
                create_box(&win, FALSE);
                ++win.startx;
                create_box(&win, TRUE);
            }
                break;
            case KEY_UP:
            if(win.starty>1){
                create_box(&win, FALSE);
                --win.starty;
                create_box(&win, TRUE);
            }
                break;
            case KEY_DOWN:
            if(win.starty<44){
                create_box(&win, FALSE);
                ++win.starty;
                create_box(&win, TRUE);
            }
                break;
        }
    }
    endwin();           /* End curses mode        */
    return 0;
}
void init_win_params(WIN *p_win)
{
    p_win->height = 2;
    p_win->width = 2;
    p_win->starty = (LINES - p_win->height)/2;
    p_win->startx = (COLS - p_win->width)/2;

    p_win->border.ls = '|';
    p_win->border.rs = '|';
    p_win->border.ts = '-';
    p_win->border.bs = '-';
    p_win->border.tl = '+';
    p_win->border.tr = '+';
    p_win->border.bl = '+';
    p_win->border.br = '+';

}
void print_win_params(WIN *p_win)
{
#ifdef _DEBUG
    mvprintw(25, 0, "%d %d %d %d", p_win->startx, p_win->starty,
                p_win->width, p_win->height);
    refresh();
#endif
}
void create_box(WIN *p_win, bool flag)
{   int i, j;
    int x, y, w, h;

    x = p_win->startx;
    y = p_win->starty;
    w = p_win->width;
    h = p_win->height;
    mvprintw(y+1,x+1,"0");
    if(flag == TRUE)
    {   mvaddch(y, x, p_win->border.tl);
        mvaddch(y, x + w, p_win->border.tr);
        mvaddch(y + h, x, p_win->border.bl);
        mvaddch(y + h, x + w, p_win->border.br);
        mvhline(y, x + 1, p_win->border.ts, w - 1);
        mvhline(y + h, x + 1, p_win->border.bs, w - 1);
        mvvline(y + 1, x, p_win->border.ls, h - 1);
        mvvline(y + 1, x + w, p_win->border.rs, h - 1);

    }
    else
        for(j = y; j <= y + h; ++j)
            for(i = x; i <= x + w; ++i)
                mvaddch(j, i, ' ');

    refresh();

}