From: Rob Browning <rlb@defaultvalue.org>
Cc: guile-devel@gnu.org
Subject: Re: real numbers and integer-expt.
Date: Wed, 13 Mar 2002 15:48:36 -0600 [thread overview]
Message-ID: <87lmcwgmvf.fsf@raven.i.defaultvalue.org> (raw)
In-Reply-To: <873cz4nuer.fsf@zagadka.ping.de> (Marius Vollmer's message of "13 Mar 2002 20:23:56 +0100")
Marius Vollmer <mvo@zagadka.ping.de> writes:
> Yes. Floats can be integers, too. However, there's a bug
> nevertheless: floats can represent integers that don't fit into 32
> bit ints. Also, complex numbers can be ints as well.
OK, that's a bit confusing -- we have SCM_COMPLEXP which does *not*
mean the same thing as scm_complex_p -- the former checks to make sure
the object, tag-wise, is a complex smob, the latter checks to see if
the object actually contains a complex number, so we have
(complex? 3) -> #t
but
SCM_COMPLEX(SCM_MKINUM(3)) -> 0
--
Rob Browning
rlb @defaultvalue.org, @linuxdevel.com, and @debian.org
Previously @cs.utexas.edu
GPG=1C58 8B2C FB5E 3F64 EA5C 64AE 78FE E5FE F0CB A0AD
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next prev parent reply other threads:[~2002-03-13 21:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-13 8:36 real numbers and integer-expt Rob Browning
2002-03-13 19:23 ` Marius Vollmer
2002-03-13 21:23 ` Rob Browning
2002-03-13 21:32 ` Rob Browning
2002-03-13 21:48 ` Rob Browning [this message]
2002-03-20 22:32 ` Marius Vollmer
2002-03-20 22:54 ` Rob Browning
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