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From: smvorkoetter@watmum.UUCP
Newsgroups: comp.lang.c
Subject: Re: COMMA separated expresses
Message-ID: <1038@watmum.UUCP>
Date: Thu, 25-Jun-87 23:59:15 EDT
Article-I.D.: watmum.1038
Posted: Thu Jun 25 23:59:15 1987
Date-Received: Sat, 27-Jun-87 07:19:50 EDT
References: <1601@oliveb.UUCP>
Reply-To: smvorkoetter@watmum.UUCP (Stefan M. Vorkoetter)
Distribution: world
Organization: U. of Waterloo, Ontario
Lines: 29

In article <1601@oliveb.UUCP> dchen@oliveb.UUCP (Dennis T. Chen) writes:
]Why did my C compiler(came with 4.3bsd) complaint the "syntax error"
]with the following COMMA separated express statements in a function:
]
]funct()
]{
]	int i = 0;
]
]	if ( i == 0 )
]		printf("A\n"), return; /* syntax error here */
]	printf("END\n");
]}
]
]But it works fine with
]
]	if ( i == 0 )
]		printf("A\n"), exit(1);	/* compile OK */
]
]Could someone point this out ? It seems to me that rule 7.15 Comma
]operator, on page 192 of C Programming Language doesn't state much
]on this.
]
]Dennis Chen
]{allegra, hplabs, idi, ihnp4, sun}!oliveb!dchen


`return' is not an expression, it is a statement.  `exit' on the other
hand is a function (which never returns, but that is a different story),
and is thus an expression.