Read only 1 character in C ++
Possible duplicate:
How does std :: iostream work?
This may sound funny, but how can I read one char from cin in C ++ (until the enter key is pressed, only one character)? I've tried operator ->, get (), getchar (), but they all read the whole line.
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cin
- buffer input. You want an "unbuffered" input. It may differ on different platforms if you are not working directly with files.
Something like this might help:
http://www.cplusplus.com/forum/beginner/3329/
[EDIT] Remember that using "buffered" v. "un-buffered" is by design and both are legal. The "default" for "buffered input" cin
doesn't make a lot of sense, since the user will "back off" to correct the input line, and you don't want the "noise" to feed your program. (And in general, "buffered input" as from files can be much more efficient.)
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While this is OS specific, on UNIX-like operating systems, you can use the termios interface to disable input buffering on the terminal by putting it in non-canonical mode:
termios t;
tcgetattr(STDIN_FILENO, &t);
t.c_lflag &= ~ICANON;
tcsetattr(STDIN_FILENO, TCSANOW, &t);
See termios (3) for details .
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