Return the character at the current cursor position on the
    specified window without making changes to the window. The inch
    function acts on the stdscr window.
    Format
      #include  <curses.h>
      char inch();
      char winch  (WINDOW *win);
1 – Argument
 win
    A pointer to the window.
2 – Return Values
    x                  The returned character.
    ERR                Indicates an input error.