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From: did@ucla-cs.UUCP
Newsgroups: net.jokes
Subject: Re: Saving rotated jokes unrotated
Message-ID: <5698@ucla-cs.ARPA>
Date: Tue, 28-May-85 00:10:23 EDT
Article-I.D.: ucla-cs.5698
Posted: Tue May 28 00:10:23 1985
Date-Received: Sat, 1-Jun-85 01:27:26 EDT
References: <184@weitek.UUCP> <2398@mit-hermes.ARPA>
Organization: UCLA Computer Science Department
Lines: 18

OK, you asked for it.  Here's my stylistic (:-) rotating/de-rotating program.
Reads from stdin and writes to stdout.

#include <stdio.h>
#include <ctype.h>
main(argc, argv)
	register char **argv;
{
        register int c;

        for(;;) putchar((c = getc(stdin)) == EOF
                          ? exit(0)
                          : isalpha(c)
                                ? isupper(c)
                                    ? 'A' + (c + 13 - 'A') % 26
                                    : 'a' + (c + 13 - 'a') % 26
                                : c);
}