Path: utzoo!attcan!uunet!decwrl!elroy.jpl.nasa.gov!jato!mars!kaleb
From: kaleb@mars.jpl.nasa.gov (Kaleb Keithley)
Newsgroups: comp.lang.c
Subject: Re: Inherent imprecision of floating point variables
Message-ID: <4186@jato.Jpl.Nasa.Gov>
Date: 27 Jun 90 20:48:02 GMT
References: <3300@crash.cts.com> <44436@ism780c.isc.com> <b3f.2688bfce@ibmpcug.co.uk>
Sender: news@jato.Jpl.Nasa.Gov
Reply-To: kaleb@mars.UUCP (Kaleb Keithley)
Organization: Jet Propulsion Laboratory, Pasadena, CA.
Lines: 29

In article <b3f.2688bfce@ibmpcug.co.uk> dylan@ibmpcug.CO.UK (Matthew Farwell) writes:
-In article <44436@ism780c.isc.com> marv@ism780.UUCP (Marvin Rubenstein) writes:
-
-Consider the code segment:-
-
-main()
-{
-	float f;
-
-	f = 0.0;
-	while (1) {
-		if (f == 10.0) break;
-		printf("%f\n", f);
-		f += 0.1;
-	}
-	printf("Stopped\n");
-}
-
-If its all to do with conversion routines, why doesn't this stop when f
-reaches 10?
-

Because (10.0 - 0.1) + 0.1 will never be exactly equal to 10.0.


kaleb@thyme.jpl.nasa.gov            Jet Propeller Labs
Kaleb Keithley

"So that's what an invisible barrier looks like"