Erase the contents of the specified window and reset the cursor
    to coordinates (0,0). The clear function acts on the stdscr
    window.

    Format

      #include  <curses.h>

      int clear();

      int wclear  (WINDOW *win);

1 - Argument

 win

    A pointer to the window.

2 - Return Values

    OK                 Indicates success.
    ERR                Indicates an error.