In the UNIX system environment, the crmode and nocrmode functions
    set and unset the terminal from cbreak mode. In cbreak mode, a
    single input character can be processed without pressing Return.
    This mode of single-character input is only supported with the
    Curses input routine getch.

    Format

      #include  <curses.h>

      crmode()

      nocrmode()

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• Example