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);
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.
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