Set the terminal so that characters may or may not be echoed on
    the terminal screen. This mode of single-character input is only
    supported with Curses.

    Format

      #include  <curses.h>

      void echo  (void);

      void noecho  (void);

1 - Description

    The noecho function may be helpful when accepting input from the
    terminal screen with wgetch and wgetstr; it prevents the input
    characters from being written onto the screen.