Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!dptg!ulysses!andante!alice!ark
From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: comp.lang.c
Subject: Re: integer to string conversion
Keywords: code
Message-ID: <9675@alice.UUCP>
Date: 24 Jul 89 19:35:44 GMT
References: <3020@ohstpy.mps.ohio-state.edu> <9813@csli.Stanford.EDU> <9814@csli.Stanford.EDU>
Organization: AT&T Bell Laboratories, Liberty Corner NJ
Lines: 15

In article <9814@csli.Stanford.EDU>, poser@csli.Stanford.EDU (Bill Poser) writes:

> It is correct that the routine I posted doesn't do the right thing on the
> most negative integer. That requires a special case, which I left out.

It is possible to do it without special cases, at least for
a very wide range of machines.  For example, every machine
I've ever seen allows you to flip the sign of the most positive
integer without overflow.  This suggests using negative numbers
for all your intermediate results.  If you do that, be careful
to defend against machines that round toward -infinity
rather than toward zero when doing integer division.
-- 
				--Andrew Koenig
				  ark@europa.att.com