Move the cursor to coordinates (y,x), get a character from the
    terminal screen, and echo it on the specified window. The mvgetch
    function acts on the stdscr window.

    Format

      #include  <curses.h>

      int mvgetch  (int y, int x);

      int mvwgetch  (WINDOW *win, int y, int x);

1 - Arguments

 win

    A pointer to the window.

 y

    A window coordinate.

 x

    A window coordinate.

2 - Description

    The mvgetch and mvwgetch functions refresh the specified window
    before fetching the character.

3 - Return Values

    x                  The returned character.
    ERR                Indicates that the function causes the screen
                       to scroll illegally. For more information, see
                       the scrollok function in this section.