Date: Wed, 31 Jan 2001 20:17:44 -0600 (CST) From: Mike Meyer <mwm@mired.org> To: Lucas Bergman <lucas@slb.to>, t.vanklaveren@student.utwente.nl Cc: questions@freebsd.org Subject: Re: Printf question Message-ID: <14968.51016.322465.80746@guru.mired.org> In-Reply-To: <109394@toto.iv>
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Lucas Bergman <lucas@slb.to> types:
> % cat foo.c
> #include <stdio.h>
>
> typedef unsigned long long uint64_t;
>
> struct thingy {
> uint64_t r_id;
> uint64_t c_id;
> };
>
> int
> main(void)
> {
> struct thingy x;
> struct thingy *res = &x;
> x.r_id = 1;
> x.c_id = 255676;
> printf("result (result %ld, cid %ld)\n", res->r_id, res->c_id);
> return 0;
> }
> % gcc -Wall foo.c
> foo.c: In function `main':
> foo.c:19: warning: long int format, different type arg (arg 2)
> foo.c:19: warning: long int format, different type arg (arg 3)
>
> What you probably want is the `%llu' specifier instead of `%ld'.
> Note that `long long' is a _very_ recent addition to the C standard,
> so proceed with caution if you want your program to be portable.
The man page doesn't mention ll as a modifier, but talks about q. I
get the results he wants with %qd, %qu, or %llu - but not %lld. -Wall
doesn't complain about either one (on -current, anyway).
<mike
--
Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.
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