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From: DAVE%UWF.BITNET@wiscvm.wisc.EDU
Newsgroups: comp.lang.c
Subject: Returning a value from ?:
Message-ID: <7555@brl-adm.ARPA>
Date: Wed, 27-May-87 22:57:43 EDT
Article-I.D.: brl-adm.7555
Posted: Wed May 27 22:57:43 1987
Date-Received: Sat, 30-May-87 11:29:29 EDT
Sender: news@brl-adm.ARPA
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All,
    Well, my recent probs with printf are solved, by linking with LCM
ahead of LC, as suggested.  Thanks.
    Next in line, I just (yesterday) got a copy of Turbo C, and was
trying out some old programs on it.  It works mostly like a champ, but
I ran across a small bug.  It goes like this:

     (f(a) * f(p) > 0) ? (a = p) : (b = p);

with the function f() being defined elsewhere, and with all things being
defined as double.  I got it to work by splitting up the ? : up into
an if ... else, but it worked w/o hitch under Lattice 3.0.  Is the above
statement not valid C code?  Should the result be put into a variable of
some sort?  I am aware of the philosophy that all expressions should
return a value, and that the value returned should be referenced.  So
is Turbo just enforcing that, or should Borland have allowed it to pass
with a warning?  (No warning was generated, but the results of the code
was strange until I cleaned it up.)

Thanx,

Dave (w/o a clue) Jaquay (DAVE@UWF.BITNET)