Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!elroy!cit-vax!tybalt.caltech.edu!palmer
From: palmer@tybalt.caltech.edu (David Palmer)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Float to integer conversion problem in LSC 3.0?
Keywords: Lightspeed, LSC, conversion
Message-ID: <7665@cit-vax.Caltech.Edu>
Date: 22 Aug 88 23:11:37 GMT
References: <5813@batcomputer.tn.cornell.edu> <4933@teddy.UUCP> <1120@usfvax2.EDU>
Sender: news@cit-vax.Caltech.Edu
Reply-To: palmer@tybalt.caltech.edu.UUCP (David Palmer)
Organization: California Institute of Technology
Lines: 21

In article <1120@usfvax2.EDU> pollock@usfvax2.usf.edu.UUCP (Wayne Pollock) writes:
>  ....
>, or use:
>
>		n = d + 0.5;
>
>or some library routine if you want to round the number.  Assuming the
>default conversions will always work perfectly is just asking for
>trouble.

Use a library routine.  n=d + 0.5 does not properly round d if d < 0
(or more precisely, d < -0.5).  if d=-1.0, for instance, d+0.5 = -0.5
which is truncated to 0 when it is assigned to an integer variable.

As long as you have thoroughly memorized K&R's white book, you should have
no problem.

		David Palmer
		palmer@tybalt.caltech.edu
		...rutgers!cit-vax!tybalt.caltech.edu!palmer
			"Flowers -- Just say NO!!"
					- Mighty Mouse