Date: Wed, 31 Jan 2001 21:45:27 -0600 (CST) From: Mike Meyer <mwm@mired.org> To: lucas@slb.to Cc: questions@freebsd.org Subject: Re: Printf question Message-ID: <14968.56279.589323.286029@guru.mired.org> In-Reply-To: <20010131213515.A12876@billygoat.slb.to> References: <109394@toto.iv> <14968.51016.322465.80746@guru.mired.org> <20010131213515.A12876@billygoat.slb.to>
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Lucas Bergman <lucas@slb.to> types:
> > > 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).
>
> Hrmm?
>
> roostor % echo 2 ^ 35 | bc
> 34359738368
> roostor % cat foo.c
> #include <stdio.h>
>
> int
> main(void)
> {
> long long x = 1LL << 35;
> printf("%lld\n", x);
> return 0;
> }
> roostor % gcc -Wall foo.c
> roostor % ./a.out
> 34359738368
If you look at the original code, he was using an unsigned long
long. %lld in that case gave different results from %qd, %qu, and
%llu.
Possibly it's a bug.
<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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