From:	Konstanty <M DOT Bialkowski AT mailbox DOT uq DOT edu DOT au>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Significant Digits
Date:	Wed, 15 Apr 1998 09:56:58 +1000
Organization:	University of Queensland
Lines:	27
Message-ID:	<3533F7CA.A4F473C3@mailbox.uq.edu.au>
References:	<35338A5C DOT D17E22CA AT e-z DOT net>
Reply-To:	M DOT Bialkowski AT mailbox DOT uq DOT edu DOT au
NNTP-Posting-Host:	csmbialk.staff.uq.edu.au
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I think that a 'double' has more than 7 sig figures.
If you need many significant figures use a 'long double' which has around 41
sig fig.

you use:
 printf("%.41Lf\n",a);
which shows 41 decimal places in Long Float mode to see them all, 7 i think
is the default setting.

Albert Bae wrote:

> Hello,
>
>    I am making a program that needs high precision because it has to
> numerically integrate a function twice.  I beleive that the double data
> type only gives 7 significant figures.  7 sig. figs. cause a round off
> error that is to large to be acceptable as an output for my program.  I
> was wondering if there was a way of increasing the number of significant
> digits that DJGPP can handle.  If I have made any mistakes in what I
> have said please feel free to correct me.  I appreciate any help that
> you can give.
>
> Thanks,
> Albert

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