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
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