Newsgroups: comp.lang.c
Path: utzoo!lsuc!dave
From: dave@lsuc.uucp (David Sherman)
Subject: Re: Use of " ? : " in format param to printf
Date: Thu, 26-Jan-89 21:27:15 EST
Summary: what if you ignore SIGFPE?
Message-ID: <1989Jan26.212721.10913@lsuc.uucp>
References: <1454@leah.Albany.Edu> <8801@alice.UUCP>
Organization: Law Society of Upper Canada, Toronto

In article <8801@alice.UUCP>, ark@alice.UUCP (Andrew Koenig) writes:
> >     printf(count == 0 ? " ---- " : " %4.0lf ", sum / count);
> 
> > Does it matter if there are unused arguments to printf?
> 
> It's OK to have unused arguments in printf, but they'll be
> evaluated whether they're used or not.  Thus in this example
> if count is 0, the likely result is a divide by zero error.

Well, you could always signal(SIGFPE, SIG_IGN) before this.
Kind of kludgey, but I think it would get around that problem
as long as you're running UNIX...

David Sherman
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