[prev in list] [next in list] [prev in thread] [next in thread] 

List:       kde-edu
Subject:    Re: [kde-edu]: unified kde-edu style?
From:       Sebastian Stein <s5228 () informatik ! htw-dresden ! de>
Date:       2002-08-08 12:25:31
[Download RAW message or body]

Uwe Thiem <uwe@polytechnic.edu.na> [020808 14:16]:
> > there's also an algorithm to convert decimal numbers of infinite
> > length, but with a repeating part ( which means the decimal
> > representations of all rational numbers ) into fractions...  I think
> > the idea was to divide the repeating part by a number which you write
> > down as x 9's where x is the length of the repeating part ( that's the
> > best i can explain it in english :). E.g. 0,111... would become 1/9
> > .  0.1212... would become 12/99 etc.  This is the way they explained
> > it to us in high school, i'm sure there's an easy way to write this
> > down in code...
> 
> With a being your periodical decimal number and n being the length of the 
> period, you multiply a by 10^n and then subtract a:
> 
> a = 0.1111111
> 
> 10a = 1.1111111
> 
> 9a = 1
> a = 1 / 9

Oh, I see. It is really very easy. I could implement this, but I think I
will wait to see how the idea of a common MathApp will develop.

Steinchen
-- 
KBruch: application to automatically generate tasks with fractions
Package: KDE Edu in KDE 3.2 (http://edu.kde.org/kbruch/)
CVS: kdeextragear-1/kbruch
State: finished
CVS Snapshot: http://www.hpfsc.de/download/kbruch-0.20.tar.gz
_______________________________________________
kde-edu mailing list
kde-edu@mail.kde.org
http://mail.kde.org/mailman/listinfo/kde-edu
[prev in list] [next in list] [prev in thread] [next in thread]