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From: kb5mu@pnet01.CTS.COM
Newsgroups: comp.lang.c
Subject: Turbo C Preprocessor bug
Message-ID: <7729@brl-adm.ARPA>
Date: Sun, 7-Jun-87 06:05:07 EDT
Article-I.D.: brl-adm.7729
Posted: Sun Jun  7 06:05:07 1987
Date-Received: Sun, 7-Jun-87 20:00:01 EDT
Sender: news@brl-adm.ARPA
Lines: 19

I still haven't bought Turbo C, but a friend reports a preprocessor
bug.  This code:
    #define ctrl(x) (x & 037)
    printf("ctrl(d) = %d\n", ctrl('d'));
expands to:
    printf("ctrl(d) = %d\n", (ctrl & 037));
instead of the correct:
    printf("ctrl(d) = %d\n", ('d' & 037));
This happens with all flavors of the compiler, including the
preprocessor-only version.

[This is an ANSI-compatible version of the more traditional
    #define ctrl(x) ('x' & 037)
    printf("ctrl(d) = %d\n", ctrl(d));
The traditional form doesn't work either.]

Paul Williamson
    ... sdcsvax!crash!pnet01!kb5mu
 or ... williams@macomw.arpa