Mail Archives: djgpp/1998/02/27/11:16:46
From: | Andrew Gibson <andrew AT petrologic DOT co DOT uk>
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | printf 'g' conversion
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Date: | Fri, 27 Feb 1998 15:17:05 +0000
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Message-ID: | <34F6D8EE.BF28CC5B@petrologic.co.uk>
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NNTP-Posting-Host: | petrologic.demon.co.uk
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MIME-Version: | 1.0
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Lines: | 31
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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I was comparing the output from a program compiled with DJGPP and the
output from the same program compiled with gcc in Linux. The output was
generated from calls to printf with ‘g’ as the conversion character. I
found that for values with absolute value less than 0.1 the outputs
differed.
For example the call: printf(“%9.9g”,0.0123456789);
displays
0.012345679
using DJGPP but
0.0123456789
using Linux.
The definition for the ‘g’ conversion character says the ‘.n’ modifier
means that at most n significant figures are printed. I think this means
in the example above the .9 means I’m asking for 9 significant figures.
From Linux this is what I get. From DJGPP I get 9 decimal places and
only 8 sig figs.
I have modified my DJGPP library source to make it work the same as
Linux in this case.
Does anyone have any comments?
Andrew Gibson
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