From: Shriramana Sharma <samjnaa@gmail.com>
To: linux-c-programming@vger.kernel.org
Subject: Double values - what precision do I use for fprintf?
Date: Thu, 12 Jan 2006 18:00:19 +0530 [thread overview]
Message-ID: <200601121800.19678.samjnaa@gmail.com> (raw)
Please observe the following printf output of eighteen double variables:
First I tried using "%20.15f" as the format string:
268.229220252114942 1.018511211250181
66.833038547989787 12.450505533056681
20.512170161382819 0.334923179252419
259.358845955701327 1.571934717666495
201.111247720862963 0.139476171219810
270.658029698352152 -0.612280599380678
105.175902698424665 -0.076345132989225
343.809699615507384 -0.219206370786681
Then I used "%30.25f":
268.2297152740335377529845573 1.0185111507334088098986058
66.8390907719954157073516399 12.4504269834231084956854829
20.5123328842112115921736404 0.3349264346316725426966343
259.3596100022817267927166540 1.5719383906021777708161835
201.1113154335791932680876926 0.1394751696317115263745734
270.6577319741974747557833325 -0.6122834912138217511312632
105.1758654981413201312534511 -0.0763454696609412730712307
343.8095929658045974974811543 -0.2192182978826520134418843
Ignoring the small differences in the two sets of data (longitude and speed of
eight celestial bodies computer at two different instants) I wonder - if I
keep increasing the number of decimal places where will it end?
--
Shriramana Sharma http://samvit.org
Running SUSE Linux 10.0 with KDE 3.5
--
Penguin #395953 resides at http://samvit.org
subsisting on SUSE Linux 10.0 with KDE 3.5
next reply other threads:[~2006-01-12 12:30 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-12 12:30 Shriramana Sharma [this message]
2006-01-12 14:17 ` Double values - what precision do I use for fprintf? Patrick Leslie Polzer
2006-01-12 18:51 ` Steve Graegert
2006-01-12 21:22 ` Nate Jenkins
2006-01-12 22:00 ` Mihai Dontu
2006-01-13 23:47 ` Glynn Clements
2006-01-14 0:35 ` Nate Jenkins
2006-01-17 5:37 ` Glynn Clements
2006-01-12 21:57 ` Scott
2006-01-12 22:06 ` Scott
2006-01-13 5:25 ` Steve Graegert
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