Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!amdahl!pacbell!ditka!stb!michael
From: michael@stb.UUCP (Michael)
Newsgroups: comp.lang.c
Subject: Re: How not to write a loop, revisited
Message-ID: <10477@stb.UUCP>
Date: 15 Jul 88 01:55:39 GMT
References: <16276@brl-adm.ARPA> <329@accelerator.eng.ohio-state.edu> <12784@apple.Apple.COM>
Reply-To: michael@stb.UUCP (Michael)
Organization: STB BBS, La, Ca, Usa, +1 213 459 7231
Lines: 19

In article <12784@apple.Apple.COM> bgibbons@apple.apple.com.UUCP (Bill Gibbons) writes:
[ discussion of whats representable or not]
>but everyone with hardware floating-point will give you the
>right result for "trunc(x/y)".

ONLY if X and Y are the same sign.

>I agree that exponentiation is not safe, but raising a floating-point value to
>an integer (typed as integer) power is always done with repeated multiplies
>(in about log2(exponent) time), and since multiplies are accurate, so is this
>type of exponentiation.

Hmm, when I've written exponentiation routines I do it with logs and exp().
Are you sure all vendors do it as you say?
			Michael
: --- 
: Michael Gersten			 uunet.uu.net!denwa!stb!michael
:				sdcsvax!crash!gryphon!denwa!stb!michael
: What would have happened if we had lost World War 2. Well, the west coast
: would be owned by Japan, we would all be driving foreign cars, hmm...