round(22.47,2) gives 22.469999999999999?

[Duncan Booth]

Eric van Riet Paap <eric at vanrietpaap.com> wrote in
news:3f30e294$0$125$e4fe514c at dreader5.news.xs4all.nl: 

> Hi,
> 
> On python2.1.3, python2.2.1 and python2.2.3 round(22.47,2) gives 
> 22.469999999999999 . Does anyone know if this is a bug or some weird,
> yet unexpected, behaviour?
> 
> P.S. I haven't tested python2.3, but python1.5.2 doesn't have this
> problem. 
> 
> 
Please read the FAQ, particularly entry 4.98 Why are floating point 
calculations so inaccurate?

http://www.python.org/cgi-bin/faqw.py?req=show&file=faq04.098.htp

-- 
Duncan Booth                                             duncan at rcp.co.uk
int month(char *p){return(124864/((p[0]+p[1]-p[2]&0x1f)+1)%12)["\5\x8\3"
"\6\7\xb\1\x9\xa\2\0\4"];} // Who said my code was obscure?