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From: greim@sbsvax.UUCP (Michael Greim)
Newsgroups: comp.lang.c
Subject: Compiler Error?
Keywords: "?:" precedence cc pcc assignment 43BSD SunOS
Message-ID: <683@sbsvax.UUCP>
Date: 14 Feb 89 18:03:06 GMT
Organization: Universitaet des Saarlandes, Saarbruecken, W-Germany
Lines: 44

This is about pre-ANSI C.

Consider the following program:

------ cut -------------------
# include <stdio.h>

main ()
{
	int i, j, k;
	i = 5;
	j = 0;
	k = 0;
	if (i == 5)
		(j = 2) ? k = 3 : 4;
	printf ("j = %d, k = %d\n", j, k);
}
------- cut -----------------

On 43BSD, SunOS 3.4, ULTRIX 2.0 this compiles with no error.

According to the C books I could get my hands on,
"?:" has higher precedence than the assignment operators, like
"=" for instance. (In X3J11 too)

Thus the compiler should find an error in the statement, something
like "misplaced assignment".

SIEMENS SINIX v2.1 finds an error.

Is it really a compiler error? In all the major compilers?
And nobody has noticed it yet? :-)
Is it a typical pcc error?
How does GNU perform?
What about the ANSI compilers?

	-mg

PS.: I found such a statement in GNU grep, when I was porting it to SINIX.
-- 
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# include <disclaimers/std.h>