On Sun, Jun 22, 2008 at 06:56:22PM +0200, Paolo Donadeo wrote:
> string_of_float is not the inverse of float_of_string, at least in
> this example.

Yes, you wouldn't expect it to be, because the string is an
approximate base 10 representation of the float (which is itself only
an approximate base 2 representation of the transcendental number pi).
You might want to read a presentation called "What every computer
programmer should know about floating point arithmetic".  There's a
PDF version here:

http://blogs.sun.com/darcy/resource/Wecpskafpa-ACCU.pdf

Rich.

-- 
Richard Jones
Red Hat