Path: utzoo!attcan!uunet!zephyr.ens.tek.com!orca.wv.tek.com!quark!jeff
From: jeff@quark.WV.TEK.COM (Jeff Beadles;685-2568;;;quark)
Newsgroups: comp.unix.questions
Subject: Re: Question on printf()
Message-ID: <7369@orca.wv.tek.com>
Date: 8 Jun 90 14:52:16 GMT
References: <24674.266e3b81@kuhub.cc.ukans.edu>
Sender: nobody@orca.wv.tek.com
Reply-To: jeff@quark.WV.TEK.COM (Jeff Beadles)
Organization: Tektronix, Inc., Wilsonville, OR
Lines: 36

In article <24674.266e3b81@kuhub.cc.ukans.edu> jian@kuhub.cc.ukans.edu writes:
|Hi folks, I have one simple question about printf() on Utrix. Following is the
|program that I question about:

...

|display()
|{ 
|   printf("\n\n\nEnter Command -> ");

Insert the line:
	fflush(stdout);

|   alarm(60);
|}
|
|I don't know why the printf() only prints three linefeeds and the "Enter 
|Command -> " only shows up on every next call to display. It seems to me
|that if I don't do any I/O and linefeed after printf(), the printf() does 
|not print the string argument on the standard output. Why? How can I avoid
|this problem? I very much appreciate any helps.
|
|Jian Li 
|jian@kuhub.cc.ukans.edu


Things will work much better with the fflush.  The problem is that stdio is
buffered by default, and is waiting for a \n to flush the output buffer.


	-Jeff

-- 
Jeff Beadles				jeff@quark.WV.TEK.COM 
Utek Engineering, Tektronix Inc.	+1 503 685 2568
			SPEEA - Just say no.