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From: mp@mit-eddie.UUCP (Mark Plotnick)
Newsgroups: net.lang.c
Subject: Re: recursive typedef in c
Message-ID: <1093@mit-eddie.UUCP>
Date: Sun, 25-Dec-83 17:56:34 EST
Article-I.D.: mit-eddi.1093
Posted: Sun Dec 25 17:56:34 1983
Date-Received: Mon, 26-Dec-83 04:10:34 EST
References: <319@aecom.UUCP> <5566@mcvax.UUCP>
Organization: MIT, Cambridge, MA
Lines: 29

One of my favorite examples of C programming came from a compiler
course I took (AM295).  The staff supplied some skeleton C programs
that we had to modify, including one that contained:

#define	EXPRPTR	struct exprnode *

typedef struct exprnode {

	/*operator result*/
	    OPCLASS op;
	    EXPRPTR opleft;
	    EXPRPTR opright;

	/*subprogram call*/
	    char *spname;
	    EXPRPTR spargs;

#undef	EXPRPTR
} *EXPRPTR;

Groan.  My all-time favorite is the following statement-and-comment,
taken verbatim from the PWB/Unix pexec() library routine:

	argv[argc] = 2;		/* don't ask why */

I still don't know what it did.  Perhaps those of you who
participated in the argc[argv] discussion can help.

	Mark