More stupid questions: prettyprinting of ints??

hello,

the thing i am making is a bookkepping program. This program handles
multiple currencies, each currency is formatted a bit differently on
from the other.

I do store the amounts as int's in the DB...
In another table i have sample format strings that could be used to
format them...

but if there is an inbuild functionality to format currencies, i will
gladly take it....
on the other hand is it possible to make substring operations in
postgres (some examples somewhere)?

What would be the best way to implement this thing?

-- 
ciao bboett
==============================================================
bboett@earthling.net
http://inforezo.u-strasbg.fr/~bboett http://erm1.u-strasbg.fr/~bboett
===============================================================
the total amount of intelligence on earth is constant.
human population is growing....