printf, data presentation

[Guy Harris]

 >On UNIX - cbreak mode. Characters are passed to the buffer immediately
 >(no newline needed) and can be read with getc() or similar.

...

 >Nothing is echoed to the terminal, so you have to do this explicitly (I 
 >think).

Incorrect.  Turning echoing off and turning canonicalization off are two
separate operations on all versions of UNIX I know of; in practice, most
programs that turn canonicalization off also turn echoing off and do the
echoing themselves, but that's not required.