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Path: utzoo!linus!philabs!cmcl2!seismo!harvard!talcott!panda!genrad!decvax!decwrl!Glacier!Shasta!mann
From: mann@Shasta.ARPA
Newsgroups: net.sources.bugs
Subject: vc bug -- %g format
Message-ID: <7826@Shasta.ARPA>
Date: Tue, 27-Aug-85 02:45:37 EDT
Article-I.D.: Shasta.7826
Posted: Tue Aug 27 02:45:37 1985
Date-Received: Thu, 29-Aug-85 23:03:52 EDT
Distribution: net
Organization: Stanford University
Lines: 13

I just ran into a bug in the spreadsheet calculator ("vc") that was posted
to net.sources a while back.  It uses a %g format to print out numbers in
several places, in particular when save files are generated.  This means
that numbers with more than 6 digits of precision get rounded off when you
save and reload your spreadsheet, when you use the "e" command, etc.  The
fix is to replace each occurrence of "%g" in a printf with "%.20g",
throughout the program.

I can hardly blame the original author of vc for this bug -- the
documentation of %g in the printf man page (at least on 4.2BSD) is very
misleading.

	--Tim